IEC 60870-5-104 Server communication protocol

Supported device types a and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Tell TELL commands
Literature
Document revisions

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typy_verzie
typy_verzie
Supported device types and versions

...

This protocol implements a server-side of IEC-104 communication (known also as IEC 870-5-104 or IEC-104) implements a server side of IEC-104 communication.

Communication supports reading and writing data by means of the IEC 60870-5-104 communication protocol operating on the basis of TCP network communication. D2000 system works in the mode IEC 60870-5-104 server mode (slave), that . It is enable able to communicate with multiple (N) clients (masters). Implementation is according to the standard IEC 60870-5-104 standard as follows:

initial Originator ASDU address is 1 byte, it is defined as a line number.
ASDU address is 2 bytes, it is defined as station address. For each station on one a line, there a different ASDU address must be defined different ASDU address.
Cause of transmission is 2 bytes (it also contains Originator ASDU address)
Information object address = IS 3 bytes, it is defined as an I/O tag address.
There are implemented the The following ASDU types in the direction of logging monitoring are implemented (from the D2000 system to the control station and also vice-versa in balanced mode):

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	tab1

Table nr. 1Table 1

ASDU type	I/O tag type
1 - Single-point information	Dout
2 - Single-point information with time tag	Dout
3 - Double-point information	Dout,Cout
4 - Double-point information with time tag	Dout,Cout
5 - Step position information	Cout
6 - Step position information with time tag	Cout
7 - Bitstring of 32 bits	Cout
8 - Bitstring of 32 bits with time tag	Cout
9 - Measured value, normalized value	Ao
10 - Measured value, normalized value with time tag	Ao
11 - Measured value, scaled value	Cout
12 - Measured value, scaled value with time tag	Cout
13 - Measured value, short floating point value	Aout
14 - Measured value, short floating point value with time tag	Aout
15 - Integrated totals	Cout
16 - Integrated totals with time tag	Cout
20 - Packed single-point information with status change detection	Cout *
21 - Measured value, normalized value without quality descriptor	Ai
30 - Single-point information with time tag CP56Time2a	Dout
31 - Double-point information with CP56Time2a tag	Dout,Cout
32 - Step position information with CP56Time2a tag	Cout
33 - Bitstring of 32 bits with CP56Time2a tag	Cout
34 - Measured value, normalized value with CP56Time2a tag	Aout
35 - Measured value, scaled value with CP56Time2a tag	Cout
36 - Measured value, short floating point value with time tag CP56Time2a	Aout
37 - Integrated totals with time tag CP56Time2a	Cout
241 - 64-bit floating point value (Ipesoft & URAP implementation)	Ao
243 - 64-bit floating point value with time tag CP56Time2a (Ipesoft & URAP implementation)	Ao
251 - Archive data values (Ipesoft's implementation)	none **
252 - D2000 Unival (Ipesoft's implementation)	all

...

Note: For setting individual bites bits of the quality byte that inform us on quality (SIQ for ASDU 1,2,30; DIQ for ASDU 3,4,31; QDS for ASDU 5..14,20,32..36), there are used the flags FLA A (0.bit), FLB B (1.bit) .. FLH H (7.bit) are used.

For example:

for ASDU 4: FLAA=DPI bit 0, FLBB=DPI bit 1, FLCC=0, FLDD=0, FLEE=BL bit, FLFF=SB bit, FLGG=NT bit, FLHH=IV bit.
for ASDU 16: FLAA..FLE E Sequence number bites bits 0..4, FLFF=CY bit, FLGG=CA bit, FLHH=IV bit

Except The exception is the bitesbits, which are set directly by a value (e.g. for ASDU 1, the 0.bit is not set by the A flag FLA but by the value of output I/O tag).
If there is the the Invalid attribute Invalid is set to for a new value, the higher highest bit (IV) will be set in the status byte of for all ASDU ASDUs (except for ASDU 21 not containing it, which does not have a status byte).

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	pozn1
	pozn1

* - Status is taken as low 2 bytes, Status change detection is taken as high highest 2 bytes of a 32-bite bit integer.

There are implemented the The following ASDU types in the direction of control control are implemented (from the control station to D2000, also the opposite direction in balanced mode):

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	tab2

Table nr. 2 Table 2

ASDU type	I/O tag type
45 - Single command	Di, Qi
46 - Double command	Qi
47 - Regulating step command	Di, Qi
48 - Set point command, normalised value	Ai
49 - Set point command, scaled value	Ci
50 - Set point command, short floating point value	Ai
51 - Bitstring of 32 bit	Ci
58 - Single command with time tag CP56Time2a	Di, Qi
59 - Double command with time tag CP56Time2a	Qi
60 - Regulating step command with time tag CP56Time2a	Di, Qi
61 - Set point command, normalised value with time tag CP56Time2a	Ai
62 - Set point command, scaled value with time tag CP56Time2a	Ci
63 - Set point command, short floating point value with time tag CP56Time2a	Ai
64 - Bitstring of 32 bit with time tag CP56Time2a	Ci
250 - Archive data request command (Ipesoft's implementation)	none **
252 - D2000 Unival (Ipesoft's implementation)	all (except Qi)

Bites Bits of "status" byte (SCO fro ASDU 45,58; DCO for ASDU 46,59; RCO for ASDU 47,60; QOS for ASDU 48..50,61..63) causes setting the flags FLA A (0.bit), FLB B (1.bit) .. FLH H (7.bit) flags with an exception for the bites, bits which are directly set by the value of a variable (SCO bit 0, DCO a and RCS bity bits 0-1). After receiving an a response (positive/negative), the flags FLAA .. FLH H flags are set according to the bites bits of the "status" byte.

When writing values, the value of 6 [Activation] is waited expected as CauseOfTransmission. Response The response of control the controlled station depends on the setting of the parameter the CMDC parameter. Originator ASDU address will be used the same as is in the received command.

Establishing a connection:

...

D2000 KOM process is waiting on a TCP port and, after establishing a connection, is waiting for

...

receiving the StartDT Act U-frame

...

from the client.

...

Then it sends StartDT Con as a response (it is possible to send TestFrame before StartDT Act).

...

If the EOI parameter

...

is set

...

, the

...

D2000 KOM

...

process will send ASDU 70 [End of initialization], the initial OA address (

...

configured as a line number) is used as Originator ASDU address

...

.
If the Synchronisation period parameter (the Time parameters tab

...

) for some

...

of the stations is different from 0, ASDU 103 [Clock synchronisation command] with CauseOfTransmission= 6 [Activation]

...

will be sent in the configured period.

...

The initial OA address (

...

configured as a line number)

...

resp. Originator ASDU of the last received ASDU

...

100 or 101

...

will be used as Originator ASDU address.

...

D2000 KOM process sends new values acquired from the

...

D2000 Server

...

process for variables with ASDU 1..14, 20, 21, 30 .. 36 to a client, which sent ASDU 100 [Interrogation Command] and new values for variables with ASDU 15,16,37 to a client, which sent ASDU 101 [Counter Interrogation Command]

...

D2000 KOM process accepts time synchronisation using ASDU

...

103

...

[Clock synchronisation command] with CauseOfTransmission=6 [Activation] or 3 [Spontaneous]. If CauseOfTransmission= 6,

...

its response dependd on setting of the

...

CMDC

...

parameter. If CauseOfTransmission= 3, it does

...

not respond.

...

D2000 KOM

...

process responds to received commands (ASDU 45..51, 58..64) with CauseOfTransmission= 6 [Activation]

...

dependd on setting

...

of the CMDC parameter.

Originator ASDU address (OA): initial OA is set as TCP line number in the configuration. The address will be used for optimum the optional sending of the ASDU 70 [End of initialization] at the beginning of a connection and always when for sending new values.
After receiving ASDU 100 or 101, there are sent the current values of all output I/O tags (with no attribute Invalid are sent (which don't have an Invalid attribute set) with the same OA as contained in ASDU 100 or 101.
As responses to received commands (ASDU 45..51, 58..64), there are sent the confirmations with using the same ASDU ASDUs as contained in the received command are sent.

The D2000 system also supports the a balanced mode. In the this mode, the task of controlled and control stations is changed. That time, symmetrical. In this mode, the D2000 system sends commands and ASDU ASDUs 100/101. The balanced mode may be used only when if it is supported by the partner station. An advantage is that the D2000 system sends can send ASDU 100 [Interrogation Command] a 101 [Counter Interrogation Command] and gets receives the status current values of output input I/O tags (configured as ASDU 1-40) after disconnection the connection was disconnected and re-establishing the connectionestablished. It is suitable to configure single-shot commands as ASDU ASDUs 45 - 64; they are not repeated after re-establishing the connection.

Writing of an output I/O tag:

When writing IEC 104 values (

...

ASDUs 1-40),

...

the rules of server protocols apply.
When writing IEC 104

...

commands (

...

ASDUs 45-64) in the balanced mode, ASDU is considered to be confirmed (

...

the

...

Transient flag is cleared) in dependence on the

...

CMDC parameter. If the connection to a client is lost when writing, the writing success depends on the

...

PW parameter.

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komunikacna_linka
komunikacna_linka
Communication line configuration

...

Communication line category: TCP/IP-TCP
TCP Parameters
- Required to define the server parameters
- Host: string containing at most 80 characters – the name of the network interface in form of INET (name or numerical address a.b.c.d, e.g. 192.168.0.1) using of which the process D2000 KOM will receive clientsused for receiving clients by the D2000 KOM process. If the name is ALL or *, tge process the D2000 KOM will wait process will listen on all network interfaces of the computer, where is running.
- Port: TCP port number (0..65535), where the process D2000 KOM process is waitinglistening.
- Line number: will be used as Originator ASDU address (1 byte, 0-255).

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	flags
	flags

Note: Starting from D2000 version 7.02.004 the flags FLA to FLP are used during setting A to P of the value of the communication line to inform are used for informing about connected active clients. Active An active client is a client who after establishing the connection sent U-frame StartDT Act, i.e. asked for sending the data. The first connected active client will cause a change of flag FLA A to TRUE, the second flag FLB B, etc upto up to flag FLP P and continuing again with the first flag FLAA. If the client sends the StopDT Act U-frame StopDT Act frame (requesting the server to stop sending data) or disconnects, the value of its flag will be changed to FALSE.

...

Communication protocol: IEC870-TCP Server.
Station The station address is a decimal number within the range 0...65535, it defines the ASDU address. It can be specified as a decimal number or as a hexadecimal number with a hash at the beginning (e.g. #0A).

Note 2: The protocol supports sending long time stamps (CP56Time2a tag) in local time or UTC time with defined offset (see the parameter the Use monotonic UTC time+ parameter).

The Browse button opens a browsing dialog for the station address. If the communication is functional, a dialog with the ASDU addresses received so far is displayed. The Refresh button can be used to clear the list of received ASDU addresses.

Image Added

Station protocol parameters

...

The following parameters can be defined as station protocol parameters:

Table nr. 3Table 3

Keyword

Full name

Meaning

Unit

Default value

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	cmdc
	cmdc

CMDC

Command Confirm

Confirmation of control ASDU.
If CMDC=0, the

process

D2000 KOM process does not confirm any control ASDU from the partner station

using backward sending

by replying with an ASDU with

other

an appropriate CauseOfTransmission.
If CMDC=1, the

process

D2000 KOM process confirms control

ASDU

ASDUs with CauseOfTransmission=7 (Activation Confirmation).
If CMDC=2, the

process

D2000 KOM process confirms control

ASDU

ASDUs with CauseOfTransmission=10 (Activation Termination).
If CMDC=3, the

process

D2000 KOM process confirms control

ASDU

ASDUs with CauseOfTransmission=7 and CauseOfTransmission=10.

-

1

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	d2cls
	d2cls

D2CLS
D2CPA
D2VCO

The parameters are intended for the configuration of a communication station for communication between two D2000 systems

with

using ASDU 252 - D2000 Unival (Ipesoft's implementation). more ...

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	d2h64
	d2h64

D2H64

D2000 64-bit Historical Values

When sending

the

historical values (as an answer to a request for historical data),

it uses

ASDU 249 will be used, which uses a 64-bit representation of floating points (the same as D2000 internally), instead of default ASDU 251 (which encodes the values as 32-bit floating points) to improve precision.
Note: Before enabling this parameter, you should verify that also the client supports ASDU 249. This support was implemented in November

,

2011 for D2000 v8.00.011.

-

False

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	dbgi
	dbgi

DBGI

Debug Input

A mask for debug levels of input data. The meaning of bits is as follows:

1

0.bit - displays a number of incoming values during General Interrogation

2

1.bit - displays all incoming values

3

2.bit - balanced mode: requesting Interrogation command was received

-

0

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	dbgo
	dbgo

DBGO

Debug Output

A mask for debug levels of output data. The meaning of bits is as follows:

1

0.bit - balanced mode: displays a number of outgoing values during General Interrogation

2

1.bit - displays all outgoing values

-

0

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	eoi
	eoi

EOI

End of initialization

If EOI=0, the

process

D2000 KOM process doesn't send ASDU 70 (End of initialisation). If EOI=1 and a client sends StartDT U-frame

StartDT

Act, the

process

D2000 KOM

responses

process responds by StartDT Con and sends ASDU 70.

-

0

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	gisn
	gisn

GISN

GI Send New

If GISN=True, then the

process

D2000 KOM process after receiving the

command

General Interrogation command sends also values with

more recent

newer times than is the time when the command is received. The value of the GI Send New parameter

GISN

must be True to send values with

more recent times using the command

future times in a reply to the General Interrogation command.

-

False

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	icf3
	icf3

ICF3

Ignore Control Field

3bit

3 bit 0

Determines

behaviour,

behavior if ASDU contains Control Field

(Receive set

with bit

1

0 (test)

)

set in

3. byte

the 3rd byte (Receive).

if ICF3=False (default), ASDU content is to be processed
if ICF3=True, ASDU content is to be ignored

The feature is

usable

useful when creating a redundant TCP connection (TCP Redundant line + IEC 870-5-104 protocol).

It is enough to provide, that active (hot) client sends ASDU

That active client should send ASDUs without the Test

bite

bit set and the passive

(standby) client sends ASDU

client should send ASDUs with the Test

bite

bit set.

-

False

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	iii
	iii

III

Ignore Invalids on Interrogation

if

If this parameter is set on a station, the

process

D2000 KOM process will not send

as a

values of I/O tags which are Invalid or Unknown, in a reply for ASDU 100 and 101 (Interrogation/Counter interrogation

command) values of I/O tags which are Invalid or Unknown. Parameter

commands). The parameter can be used e.g.

when controlling,

for control applications - if sending Invalid values causes

breakdown of

problems in control.

-

False

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	it
	it

IT

Ignore Tests

Determines

behaviour,

behavior if ASDU

contains 1 bite (test

contains the highest 7th bit (Test) set in CauseOfTransmission.

if IT=0 (default), ASDU content will be processed
if IT=1, ASDU content will be ignored
if IT=2,

there will

a Weak attribute will be set

weak attribute

The feature is

usable

useful when creating a redundant TCP connection.

It is enough to provide, that active (hot) client sends ASDU

The active client should send ASDUs without the Test

bite

bit set and the passive

(standby) client sends ASDU

client should send ASDUs with the Test

bite

bit set.

-

0

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	iua
	iua

IUA

Ignore Unknown Addresses

If IUA=TRUE, the

process

D2000 KOM

will

process will not show an error on its console or write it into log files in case that incoming value has the address not matching any of the addresses of I/O tags defined in the D2000 system.

-

False

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	ii
	ii

II

Implicit Interrogation

Balanced mode: After connecting the client,

there are automatically sent

the values of all variables are automatically sent without any need for ASDU 100 and 101 [Interrogation/Counter Interrogation Command] requests.

-

False

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	icci
	icci

ICCI

Interrogation Covers Counter Interrogation

As a reply to Interrogation,

there are also sending ASDU 15

ASDUs 15,16,37 (Integrated Totals) will be also sent, which are by default requested by ASDU 101 [Counter Interrogation].

-

False

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	igo
	igo

IGO

Interrogation Groups Objects

Optimisation

Optimization of sending values during General Interrogation (answer to Interrogation Command/Counter Interrogation Command). If IGO=True, multiple values will be sent inside a single ASDU (so that the length of ASDU is within maximum defined by the standard - 253 Bytes). This parameter does not influence change-based sending of values during normal communication.

-

False

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	iua
	iua

IWOT

Interrogation WithOut Timestamps

If

IWOT

Interrogation WithOut Timestamp=True then values sent as a response to ASDU 100 [Interrogation Command] will be sent as ASDUs without timestamps.
For example instead of ASDU 2 (Single-point information with time tag) or ASDU 30 (Single-point information with time tag CP56Time2a) ASDU 1 (Single-point information) will be sent.
This

behaviour

behavior is suitable in a situation when the values have been invalidated as a result of communication error and, after the communication is re-established, the values come with old timestamps which causes problems in

archives

historical values depending on them will be also invalid till a new value arrives). At the same time, this behavior is strictly according to the IEC standard, which says that the response to Interrogation should not use ASDUs with time stamps.

-

False

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	k
	k

K

Sending window size i.e. packet quantity, which is sent by the

process

D2000 KOM process without receiving a confirmation (S-frame or I-frame). According to the standard, the default value is 12.

-

12

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	mc
	mc

MC

Maximum Clients

Maximum

The maximum number of connected clients.

Parameter

The parameter is needed for D2000 OpenVMS, where a task pool containing 2 * MC tasks for client handling (one task for receiving data, one task for sending data) is created during KOM startup. If

a

the value of

parameter

the Maximum Clients parameter is equal to 0, the number of clients is not limited and threads are created dynamically as needed.

-

0

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	nf
	nf

NF

No Flags

If the value of the parameter is True, then the status

bit

byte of incoming ASDUs is ignored and not saved into the

flags FA

A ..

.FH

H flags. Flags of output I/O tags are also ignored and they

not set

don't influence the status

bit

byte.

-

False

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oic

	ocic

oic

	ocic

OIC

OCIC

Order of Counter IC

Balanced mode:

Sending sequence

Order of sending of ASDU

100

101 [Counter Interrogation Command] when initializing the connection. If

OIC<OCIC

OCIC<OIC, then ASDU

100

101 is

sending

sent before ASDU

101

100. If

OIC

OCIC= 0, ASDU

100

101 is not

sending

sent. The parameter can be defined

and valid specially

for each of the stations.

-

0

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ocic

	oic

ocic

	oic

OCIC

OIC

Order of

Counter

IC	Balanced mode:

Sending sequence

Order of sending of ASDU

101

100 [

Counter

Interrogation Command] when initializing the connection. If OIC<OCIC, then ASDU

101

100 is

sending

sent before ASDU

100

101. If OIC= 0, ASDU

101

100 is not

sending

sent. The parameter can be defined

and valid specially

for each of the stations.

-

0

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	pw
	pw

PW

Pessimistic Write

Defines the evaluation of writing success in case of a connection of more than one client. If PW=0, writing a value is

consider

considered to be successful

,

if at least one client confirms it (confirmation method is defined by the

parameter

CMDC parameter). If PW=1, writing must be confirmed by all connected clients. If at least one client doesn't confirm it (e.g. connection failure occurs or the confirmation is negative), writing is

consider

considered to be unsuccessful.

-

0

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	ssn
	ssn

SSN

Send sequence number

Initial SSN

The initial Send sequence number after the TCP connection is established. According to the standard, having established the connection the

SSN

Send sequence number is set to 0, other than zero could be appropriate e.g. for testing.

-

0

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	sko
	sko

SKO

Standby Keep Open

If True

-

, after

transition of the process

changing the status of the D2000 Server

,

process (the

process

D2000 KOM process is connected to

,

) from

the HOT status to the STANDBY status (

Hot to Standby state (in a redundant system), connections with clients will not be closed, and

receiving the

listening for new clients will not be

terminated

aborted.

-

False

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	sscf3
	sscf3

SSCF3

Standby Set Control Field

If True,

-

after

transition of the process

changing the status of the D2000 Server

,

process (the

process

D2000 KOM process is connected to

,

) from

the HOT status to the STANDBY status (

Hot to Standby state (in a redundant system),

there will be sent the value of 1 in the lowest bite of 3.byte of Control Field of Information APDU

the lowest bit of the 3rd Control Field byte of information APDUs (APDU containing data or commands) will be set to 1 instead of the standard value of 0

(according to the standard)

. The

behaviour doesn't

behavior does not strictly follow the standard and

if possible, use the parameter SST

we recommend using the Standby Set Test Bit parameter instead of this parameter if it is possible.

-

False

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	sstb
	sstb

SSTB

Standby Set Test Bit

If True

-

, after

transition of the process

changing the status of the D2000 Server

,

process (the

process

D2000 KOM process is connected to

,

) from

the HOT status to the STANDBY status (

Hot to Standby state (in a redundant system),

there

the Test bit will be

sent Test bit

set in Cause Of Transmission.

-

False

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	swv
	swv

SWV

Standby Write Values

If True

-

, after

transition of the process

changing the status of the D2000 Server

,

process (the

process

D2000 KOM process is connected to

,

) from

the HOT status to the STANDBY status (

Hot to Standby state (in a redundant system), the server will send new values to clients.

-

False

Kotva

	w
	w

W

Quantity

The number of received

packets

I-frames, after which the

process

D2000 KOM process sends

a

an S-frame confirmation. According to the standard, the default value is 8.

There

The relation W < K must be true

w < k

, the standard recommends

w

W = 2/3 *

k

K.

-

8

Kotva

	wt1
	wt1

WT1

Wait Timeout T1

Timeout for receiving the confirmation of a sent I-frame

sent

(either

the

confirmation within the I-frame or the S-frame itself) or a U-frame. If the

process

D2000 KOM

doesn't get the confirmation in the time WT1

process does not receive the confirmation within Wait Timeout T1 time, it closes the TCP connection. According to the standard, the

WT1

Wait Timeout T1 default value is 15000 ms

.

ms

15 000

Kotva

	wt2
	wt2

WT2

Wait Timeout T2

Timeout for sending the confirmation of a received I-frame

received

.

WT2 < WT1

Wait Timeout T2 < Wait Timeout T1. If another I-frame (which confirms the received I-frame

received

) is not sent

in the time WT2

within Wait Timeout T2 time since the I-frame was received,

so

the

process

D2000 KOM process sends

a

an S-frame confirming the received I-frame to the partner. According to the standard, the

WT2

Wait Timeout T2 default value is 10000 ms.

ms

10 000

Kotva

	wt3
	wt3

WT3

Wait Timeout T3

Timeout for sending test frames ( TEST ACT U-frame

TEST ACT

). If no data are sent in any direction for a long time,

an

a TEST ACT U-frame

TEST ACT

will be sent

to

after the

process D2000 KOM after

expiration of the

WT3 time and there

Wait Timeout T3 time by the D2000 KOM process, and a TEST CON U-frame is expected (

in the WT1

within Wait Timeout T1 time after sending)

receiving a U-frame TEST CON

. If the

WT3

Wait Timeout T3 on the partner side is set to a lower value, it sends the test frames, and the

process

D2000 KOM process replies to them. According to the standard, the

WT2

Wait Timeout T2 default value is 20000 ms.
Setting the value to 0 disables sending test frames.

ms

20 000

Kotva

	wtn
	wtn

WTN

Wait Timeout No answer

Balanced mode: Timeout for receiving the confirmation of a sent value

for ASDU

in

the

a control direction

of control

(

ASDU

ASDUs 45 - 64). Receiving e.g. S-frame with RSN (Receive Sequence Number) confirming, that the other party received the previous I-frame doesn't mean, that the I-frame was processed.

In the WTn time

Within the Wait Timeout No answer time interval, the

process

D2000 KOMprocess waits for receiving the response (e.g. after sending ASDU with TypeIdentificator=45 [Single Command] with CauseOfTransmission=6 [Activation]

there is expected

, the receiving of Single Command with CauseOfTransmission=7 [Activation Confirmation] is expected.

After the expiration of the

WTn time

Wait Timeout Tn, the

process

D2000 KOM process closes the TCP connection.

ms

60 000

String A string containing the protocol parameters is being defined as follows:

...

WTn=10000;WT3=25000;OCIC=0;

If there is used a keyword with an invalid value in the initialization string , there will be used is found, a corresponding default value according to the tableTable 3 will be used. Defined parameters, except for OIC, OCIC and FST are valid for the entire line - i.e. it is enough to define them for one station on the line.

...

I/O tag address is mapped on to the Information object address, i.e. it has 3 bytes and must within the range of 0..16777215. It can be specified as a decimal number or as a hexadecimal number with a hash at the beginning (e.g. #0A).
The I/O tag with an address starting with %IGNORE will be ignored.
Input tags must be of particular types (Input tags must be particular types (Ai, Ci, Di, Qi) for received ASDU, see the table see Table 1.
For a particular type of output tag (Ao, Dout, Co), it is necessary to set an ASDU type, that has to be used, see the table see Table 2 and also the table also Table 1 in the balanced mode.
Archive for providing old values: if the client requires archive values using ASDU 250, the server sends:
1. values of archived I/O tag, which are defined in this entry fieldthe values of the historical value specified by this input entry field,
2. if the input entry field is not definedfilled, then the values of archived I/O tag, that are directly archived by the historical value that archives the I/O tag,
3. if the archived I/O tag specified historical value does not exist, then the values of the I/O tag , that is archived by archives the control object of the specified I/O tag,
4. if the control object doesn't does not exist (or the archive is not available), the server returns an error.
Definition of an I/O tag allows Specification of a historical value allows configuring e.g. to set sending 10-minute averages instead of sending all changes of minutes averages instead of sending all changes of given I/O tag.

Browse

For the I/O tags, it is possible to discover the list of objects, as long as the KOM process is running and communication with a station is established.
Clicking the Browse button opens the IEC870-TCPSRV Item Browser window and displays a list of objects that have been read so far. The object list is created dynamically as a result of received messages.

The list of objects is dynamic, i.e. when a new value arrives in the KOM process, it is updated. Filtering in individual columns is also supported, asterisks can be used in the mask (e.g. *Short*).

Double-clicking on a particular line will cause the Address parameter to be inserted into the configuration of the I/O tag from which the IEC870-TCPSRV Item Browser window was opened.

The Refresh button clears the list of values in both the CNF and the KOM process.

The Value column contains the received value.

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Ver. 1.0 – 5.2.February 5th, 2004
Ver. 1.1 – December 1st, 2004: extension - support of balanced mode
Ver. 1.2 – June 15th, 2020: browsing support

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Communication protocols

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IEC 60870-5-104 Server communication protocol

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Establishing a connection:

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IEC 60870-5-104 Server communication protocol

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Supported device types and versions

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Communication line configuration

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tell_cmd
Tell commands

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