IEC

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60870-5-101 communication protocol

Supported device types and versions
Communication line configuration
Communication station configuration
Line protocol parameters
I/O tag configuration
Tell commands
Literature
Changes and modifications
Document revisions

Kotva
typy_verzie
typy_verzie
Supported device types and versions

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Protocol This protocol (known also as IEC 870-5-101 or IEC-101) supports:

standard IEC 60870-5-101:2003 in modes both "unbalanced" (master and slave) and "balanced" modes,
redundancy of communication lines according to the so-called Norwegian convention (Norwegian IEC 870-5-101 User Conventions).

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Kotva
komunikacna_linka
komunikacna_linka
Communication line configuration

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Line categories:

Implementation is, according to the IEC870-5-101 standard, as follows:

Originator The originator ASDU address is not present.
ASDU address is 1 byte, it is defined as the station address. ASDU addresses of all stations on one line must be different.
Cause The cause of transmission is 1 byte (does not contain Originator ASDU address).
Information The information object address is 2 bytes, it is defined as an I/O tag address.

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If you require the system-redundant communication, use the line category SerialOverUDP System&Line Redundant. or Serial System&Line Redundant line categories. Providing that, this communication should be also network redundant, enter "Secondary line" for both "A System" and "B System". This configuration then works in such a way that it concurrently sends and receives data from two systems and each is network-redundantly connected in compliance with the so-called Norwegian convention (Norwegian IEC 870-5-101 User Conventions).

Kotva
komunikacna_stanica
komunikacna_stanica
Communication station configuration

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Communication protocol "IEC 870-5-101 balanced", "IEC 870-5-101 unbalanced primary (Master)" or "IEC 870-5-101 unbalanced secondary (Slave)".
Station The station address is a decimal number in range 0 - 255 and is used in the protocol as the ASDU address.
The synchronization of the station real-time may be enabled also for the protocols "master" and "balanced - station A (controlling)". Set the synchronization period to a nonzero value. The synchronization is executed by ASDU 103 "Clock synchronization command" in the local time according to settings of the D2000 System.

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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

Kotva
linka_parametre
linka_parametre
Line protocol parameters

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Configuration dialog box - tab Protocol parameters.
They influence some optional parameters of the protocol. The following station protocol parameters can be set:

Table 1

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Configuration dialog box - tab Protocol parameters.
They influence some optional parameters of protocol. Following station protocol parameters can be set:

Table 1

Parameter

Meaning

Unit

Default value

KotvalalaLink Address

Parameter

Meaning

Unit

Default value

Kotva

	la
	la

Link Address

Common link address.

-

1

Kotva

	lasdu
	lasdu

Length of ASDU Address

Length of ASDU address.

1/2 byte(s)

1

Kotva

	lla
	lla

Length of Link Address

Length of common link address.

1/2 byte(s)

1

Kotva

	lioa
	lioa

Length of Info Object Address

Length of info object address.

1/2/3 byte(s)

2

Kotva

	lcot
	lcot

Length of Cause Of Transmission

Length of "Cause Of Transmission".

1/2 byte(s)

1

Kotva

	rc
	rc

Retry Count

Delay

The delay between request retry in case of a communication failure.

-

2

Kotva

	rt
	rt

Retry Timeout

Delay

The delay between retry of call in case of a communication error.

ms

100 millisecond

Kotva

	wft
	wft

Wait First Timeout

Delay after sending the request before reading the response.

ms

100 millisecond

Kotva

	wt
	wt

Wait Timeout

Delay between response readings

till its completing

until it is completed.

ms

500 millisecond

Kotva

	mwr
	mwr

Max. Wait Retry

Retry count of response reading

till its completing

until it is completed.

-

6

Kotva

	ndt
	ndt

No Data Timeout

Delay of next call "Request user data class 1/2" if no data have been received (only master).

ms

300 millisecond

Kotva

	it
	it

Inactivity Timeout

Interval of connection monitoring. If no valid data have not been received, station status will

pass

go to a communication error. Switching of redundant devices in case of SerialOverUDP Device Redundant line (only slave).

ms

5 sec.

Kotva

	mt
	mt

Moxa Timeout

Interval of

The switching interval of the redundant devices MOXA NPort in case of communication error (only master, balanced).

sec.

10

Kotva

	sf
	sf

Source Flags

Set flags FI..FL according to the source of line. If SerialOverUDP System+Line Redundant is used, the values will have these flags:

System A, primary line: FI
System A, secondary line: FJ
System B, primary line: FK
System B, secondary line: FL

Note: Flag was used in communication with redundant systems to distinguish the wrong values that were sent by a partner system, which was supposed to be passive and not to send nothing.

-

NO

Kotva

	nf
	nf

No Output Flags

Activation of parameter results in ignoring

of

flags FA..FH for output I/O tags. If this parameter is turned off, flags FA..FH are mapped to individual bits of a quality byte.

-

NO

Kotva

	ltt
	ltt

Link Test Timeout

Interval of request sending "Test function for link" if timeout elapsed and no data telegrams

was

were transferred (

only balanced

balanced only).

sec.

10

Kotva

	sv
	sv

Single Value In Spontaneous Answer

When sending spontaneous changes, these will be sent one-per-ASDU and they will not be cumulated into longer packets.

Parameter

The parameter was implemented to handle a bug in a particular TM1703mic.

-

NO

Kotva

cmdc

	dc

cmdcSend Confirmation CommandType of sent confirmation to write value (only slave, balanced).-
7(CONF)
10(TERM)
7(CONF) and 10(TERM)7(CONF) KotvaaccaccAccept Confirmation CommandType of record confirmation to be accepted successfully (only master, balanced).-
7(CONF)
10(TERM)
7(CONF) or 10(TERM)7(CONF) or 10(TERM) KotvamtumtuMax. MTULimitation of data packet size (only slave, balanced). bytes220 KotvadirabdirabPhys. Trans. Direction Setting a bit DIR in balance mode (only balanced).Station A(Controlling)
Station B(Controlled)Station A(Controlling) KotvasbacksbackSingle Byte AckSend single-byte ACK preferentially (0xE5).YES/NO NO KotvaicciicciInterrog. Covers CountersSend the call 100 and counter values on general interrogation (only slave, balanced).YES/NOYES KotvaseoiseoiSend EOISend "end of interrogation command" to all ASDU (only slave).YES/NOYES KotvasisdsisdSend Interrog. in Sec. Direct. Send general interrogation command in case of slave or balanced controlled station B (only slave, balanced).YES/NONO KotvasmsmSinaut ModeCommunication for system Sinaut Spectrum, which requires non-standard behavior on redundant lines (different from the Norwegian convention).YES/NONO KotvafdfdFull DebugHigh level of communication tracking, the loaded values of I/O tags and other debug information are shown. YES/NONO

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Possible value types of I/O tags: Ai, Ao, Di, Dout, Ci, Co, Qi

I/O tag address is numerical address of data object IOA (in range 0 - 65535).

In case of command direction in master or balanced mode is necessary to configure je proper ASDU type:

ASDU type	I/O Tag type
45 - Single command	Dout
46 - Double command	Dout, Co
47 - Regulating step command	Dout
48 - Set point command, normalised value	Ao
49 - Set point command, scaled value	Co
50 - Set point command, short floating point value	Ao
51 - Bitstring of 32 bit	Co
58 - Single command with time tag CP56Time2a	Dout
59 - Double command with time tag CP56Time2a	Dout, Co
60 - Regulating step command with time tag CP56Time2a	Dout
61 - Set point command, normalised value with time tag CP56Time2a	Ao
62 - Set point command, scaled value with time tag CP56Time2a	Co
63 - Set point command, short floating point value with time tag CP56Time2a	Ao
64 - Bitstring of 32 bit with time tag CP56Time2a	Co

In case of slave or balanced mode je is necessary to configure je proper ASDU type in v data direction:

ASDU type	I/O Tag type
1 - Single-point information	Di, Qi (On/Off), Ai, Ci
2 - Single-point information with time tag	Di, Qi (On/Off), Ai, Ci
3 - Double-point information	Qi, Ai, Ci
4 - Double-point information with time tag	Qi, Ai, Ci
5 - Step position information	Ci, Ai *
6 - Step position information with time tag	Ci, Ai *
7 - Bitstring of 32 bits	Ci, Ai
8 - Bitstring of 32 bits with time tag	Ci, Ai
9 - Measured value, normalized value	Ai
10 - Measured value, normalized value with time tag	Ai
11 - Measured value, scaled value	Ci, Ai
12 - Measured value, scaled value with time tag	Ci, Ai
13 - Measured value, short floating point value	Ai
14 - Measured value, short floating point value with time tag	Ai
15 - Integrated totals	Ci, Ai
16 - Integrated totals with time tag	Ci, Ai
17 - Event of protection equipment with time tag	Ci, Ai, TiR **
18 - Packed start events of protection equipment with time tag	Ci, Ai, TiR ***
20 - Packed single-point information with status change detection	Ci, Ai
21 - Measured value, normalized value without quality descriptor	Ai
30 - Single-point information with time tag CP56Time2a	Di, Qi (On/Off), Ai, Ci
31 - Double-point information with CP56Time2a tag	Qi, Ai, Ci
32 - Step position information with CP56Time2a tag	Ci, Ai *
33 - Bitstring of 32 bits with CP56Time2a tag	Ci, Ai
34 - Measured value, normalized value with CP56Time2a tag	Ai
35 - Measured value, scaled value with CP56Time2a tag	Ci, Ai
36 - Measured value, short floating point value with time tag CP56Time2a	Ai
37 - Integrated totals with time tag CP56Time2a	Ci, Ai
38 - Event of protection equipment with time tag CP56Time2a	Ci, Ai, TiR **
39 - Packed start events of protection equipment with time tag CP56Time2a	Ci, Ai, TiR ***
40 - Packed output circuit information of protection equipment with time tag CP56Time2a	Ci, Ai, TiR ***

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if bit IV (Invalid) is set, status of value will be Invalid
if one of bits NT (Not topical), SB (Substituted), BL (Blocked), OV (Overflow), CA(Counter adjusted), CY(Counter overflow) is set for proper ASDU types, status of value will be Weak.

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	dc

Data Class

The class used for sending data (slave only). IEC 101 Master sends Class1 (high priority) and Class2 (normal) read data requests. Slave responds to them with data or a message that it has no data. In both Class1 and Class2 responses there is an ACD flag that the slave has Class1 data available. If set, the IEC 101 Master will then request Class1 data.

The parameter affects behavior as follows:

Class1&2 - IEC 101 Slave responds to Class1 and Class2 requests with data. The ACD flag sets if it has additional data.
Class1 - IEC 101 Slave sends all data as Class1 and responds to the Class2 requests that it has no data. The ACD flag sets if it has additional data.
Class2 - IEC 101 Slave sends all data as Class2 and responds to the Class1 requests that it has no data. The ACD flag sets to 0 (it does not have Class1 data).
Prio reply - IEC 101 Slave sends responses to command ASDUs as Class1 data and other ASDUs (value changes, responses to Interrogation) as Class2.
Note: The responses to Interrogation (ASDU 100) and Counter Interrogation (ASDU 101) commands and all the values sent as a part of the response are also sent as Class1 data.

The default value of the parameter is Class1.

-

Class1&2
Class1
Class2
Prio reply

Kotva

	sr
	sr

Single Request

Discard received data before sending a response (only slave). If a correct request is received and the IEC 101 Slave wants to send a response, it will clear the incoming queue before sending, if the queue has data in it. This parameter serves as a protection against various data duplications due to communication partner errors (e.g. OSI Monarch with RtuPing running during switching of active communication line).

-

NO

Kotva

	cmdc
	cmdc

Send Confirmation Command

Type of sent confirmation to write value (only slave, balanced).

-
7(CONF)
10(TERM)
7(CONF) and 10(TERM)

7(CONF)

Kotva

	acc
	acc

Accept Confirmation Command

Type of record confirmation to be accepted successfully (only master, balanced).

-
7(CONF)
10(TERM)
7(CONF) or 10(TERM)

7(CONF) or 10(TERM)

Kotva

	mtu
	mtu

Max. MTU

Limitation of data packet size (only slave, balanced).

bytes

220

Kotva

	dirab
	dirab

Phys. Trans. Direction

Setting a bit DIR in balance mode (only balanced).

Station A(Controlling)
Station B(Controlled)

Station A(Controlling)

Kotva

	sback
	sback

Single Byte Ack

Send single-byte ACK preferentially (0xE5).

YES/NO

NO

Kotva

	icci
	icci

Interrog. Covers Counters

Send the call 100 and counter values on general interrogation (only slave, balanced).

YES/NO

YES

Kotva

	seoi
	seoi

Send EOI

Send "end of interrogation command" to all ASDU (only slave).

YES/NO

YES

Kotva

	sisd
	sisd

Send Interrog. in Sec. Direct.

Send general interrogation command in case of slave or balanced controlled station B (only slave, balanced).

YES/NO

NO

Kotva

	sm
	sm

Sinaut Mode

Communication for system Sinaut Spectrum, which requires non-standard behavior on redundant lines (different from the Norwegian convention).

YES/NO

NO

Kotva

	srmast
	srmast

System Redundancy: Manages A Status Address

Address of station and output I/O tag with the status of system redundancy. The format of the address is Station Address, I/O tag address, for example. "1,1003".
The parameter is useful for SerialOverUDP System&Line Redundant lines, which enable communication with two independent control systems (e.g. main dispatching SED in Žilina and backup dispatching SED in Bratislava).
The parameter enables one to ignore values that are received from the control system, which is inactive just now, providing that the application knows which one is active or inactive. It can know it e.g. based on the value of the input I/O tag with the defined value.
This feature (information about active control system) will work providing that station with the output I/O tag of Dout type exist with the same addresses as is defined in this parameter and the application must write True into it if "System A" is active, or False if "System B" (configured on the system redundant line) is active.

-

Kotva

	fd
	fd

Full Debug

A high level of communication tracking, the received values of I/O tags and other debug information is shown.

YES/NO

NO

Kotva
merany_bod
merany_bod
I/O tag configuration

...

Possible value types of I/O tags: Ai, Ao, Di, Dout, Ci, Co, Qi

I/O tag address is a numerical address of data object IOA (in range 0 - 65535).

In case of command direction in master or balanced mode is necessary to configure a proper ASDU type:

ASDU type	I/O Tag type
45 - Single command	Dout
46 - Double command	Dout, Co
47 - Regulating step command	Dout
48 - Set point command, normalised value	Ao
49 - Set point command, scaled value	Co
50 - Set point command, short floating point value	Ao
51 - Bitstring of 32 bit	Co
58 - Single command with time tag CP56Time2a	Dout
59 - Double command with time tag CP56Time2a	Dout, Co
60 - Regulating step command with time tag CP56Time2a	Dout
61 - Set point command, normalised value with time tag CP56Time2a	Ao
62 - Set point command, scaled value with time tag CP56Time2a	Co
63 - Set point command, short floating point value with time tag CP56Time2a	Ao
64 - Bitstring of 32 bit with time tag CP56Time2a	Co

In case of slave or balanced mode je is necessary to configure je proper ASDU type in v data direction:

ASDU type	I/O Tag type
1 - Single-point information	Di, Qi (On/Off), Ai, Ci
2 - Single-point information with time tag	Di, Qi (On/Off), Ai, Ci
3 - Double-point information	Qi, Ai, Ci
4 - Double-point information with time tag	Qi, Ai, Ci
5 - Step position information	Ci, Ai *
6 - Step position information with time tag	Ci, Ai *
7 - Bitstring of 32 bits	Ci, Ai
8 - Bitstring of 32 bits with time tag	Ci, Ai
9 - Measured value, normalized value	Ai
10 - Measured value, normalized value with time tag	Ai
11 - Measured value, scaled value	Ci, Ai
12 - Measured value, scaled value with time tag	Ci, Ai
13 - Measured value, short floating point value	Ai
14 - Measured value, short floating point value with time tag	Ai
15 - Integrated totals	Ci, Ai
16 - Integrated totals with time tag	Ci, Ai
17 - Event of protection equipment with time tag	Ci, Ai, TiR **
18 - Packed start events of protection equipment with time tag	Ci, Ai, TiR ***
20 - Packed single-point information with status change detection	Ci, Ai
21 - Measured value, normalized value without quality descriptor	Ai
30 - Single-point information with time tag CP56Time2a	Di, Qi (On/Off), Ai, Ci
31 - Double-point information with CP56Time2a tag	Qi, Ai, Ci
32 - Step position information with CP56Time2a tag	Ci, Ai *
33 - Bitstring of 32 bits with CP56Time2a tag	Ci, Ai
34 - Measured value, normalized value with CP56Time2a tag	Ai
35 - Measured value, scaled value with CP56Time2a tag	Ci, Ai
36 - Measured value, short floating point value with time tag CP56Time2a	Ai
37 - Integrated totals with time tag CP56Time2a	Ci, Ai
38 - Event of protection equipment with time tag CP56Time2a	Ci, Ai, TiR **
39 - Packed start events of protection equipment with time tag CP56Time2a	Ci, Ai, TiR ***
40 - Packed output circuit information of protection equipment with time tag CP56Time2a	Ci, Ai, TiR ***

Kotva

	poz1
	poz1

Note 1: Individual bits of a quality byte (SIQ for ASDU 1,2,30; DIQ for ASDU 3,4,31; QDS for 5-14,20,32-36) set the attributes FLA (0.bit), FLB (1.bit) ..FLH (7.bit).
Example:
for ASDU 4: FLA=DPI bit 0, FLB=DPI bit 1, FLC=0, FLD=0, FLE=BL bit, FLF=SB bit, FLG=NT bit, FLH=IV bit.
for ASDU 16: FLA..FLE Sequence number bits 0..4, FLF=CY bit, FLG=CA bit, FLH=IV bit

Moreover:

if bit IV (Invalid) is set, the status of value will be Invalid
if one of the NT (Not topical), SB (Substituted), BL (Blocked), OV (Overflow), CA (Counter adjusted), or CY (Counter overflow) bits are set in their respective ASDU types, the status of value will be Weak.

Kotva

	pozn1
	pozn1

* - T-bit from the value of ASDU sets the attribute FI into the value of I/O tag which has value type Ci/Ai and they are interpreted as numbers -64 up-to +63.

Kotva

	pozn2
	pozn2

** - ASDU 17 and 38: the value of SEP byte sets the attributes FLA (0.bit), FLB (1.bit) up-to FLH (7.bit), following 2 bytes (CP16Time2a) are interpreted as a positive number (0-60 000) into the value of I/O tag with value type Ci/Ai or as a relative time (0-60 seconds) into the value of I/O tag with TiR value type.

Kotva

	pozn3
	pozn3

*** - ASDU 18, 39 and 40: value of SPE(ASDU 18,39) or OCI (ASDU 40) byte sets the attributes FLI (0.bit), FLJ (1.bit) up-to FLP (7.bit). The value of byte QDP sets the attributes FLA (0.bit), FLB (1.bit) up-to FLH (7.bit), following 2 bytes (CP16Time2a) are interpreted as a positive number (0-60 000) into the value of I/O tag with value type Ci/Ai or as a relative time (0-60 seconds) into the value of I/O tag with TiR value type.

Note 2: When using the system and line redundant categories of lines, the status of line and station is formed by a logical sum of all used lines. It means, that if the redundant system consists of four lines and just one line is working, the status of the station and line is all right. The status of lines is presented with the help of special input or output I/O tag (of integer and real type, i.e. Ai/Ao/Ci/Co). The name of this I/O tag has this format: [line_name]_SystemStatus (e.g. for line L.Test it is M.Test_SystemStatus). The value of the I/O tag represents the binary format of the status of N-tuple lines. If the first three lines are okay but the last one does not work (SystemB/SecondaryLine) i.e. [FALSE, TRUE, TRUE, TRUE], I/O tag has the value 0b0111, i.e. 7.
The order of lines mapped to individual bits is [SystemB/SecondaryLine, SystemB/PrimaryLine, SystemA/SecondaryLine, SystemA/PrimaryLine].

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 IEC870-5-101 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 IEC870-5-101 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.

Image Added

Kotva
tell_cmd
tell_cmd
Tell commands

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Command	Syntax	Description
STWATCH	STWATCH StationName	Tell command sends Interrogation Command (if it is configured/permitted for specific protocol).

Kotva
literatura
literatura
Literature

...

Telecontrol equipment and systems Part 5-101: Transmission protocols – Companion standard for basic telecontrol tasks (IEC 60870-5-101:2003), http://www.iec.ch.
Telecontrol equipment and systems Part 5-2: Link transmissions procedures (IEC 60870-5-2:1992), http://www.iec.ch.
Norwegian IEC 870-5-101 User Conventions, Approved version Revision no. 2.0, http://www.statnett.no.

Info

title	Blogs

You can read blogs about the IEC 870-5-101 protocol (for now, in Slovak language only):

Note 2: When using the system and line redundant categories of lines, the status of line and station is formed by a logical sum of all used elements. It means, that if the redundant system consists of four lines and just one line is working, status of station and line is all right. The status of lines is presented with the help of special output I/O tag (integer and real type). Name of this I/O tag has this format: [name of line]_SystemStatus. The value of I/O tag represents binary format of status of N-tuple lines. If the first three lines are okay but the last one does not work [FALSE,TRUE,TRUE,TRUE], I/O tag has the value 0b0111, i.e. 7

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Kotva
zmeny_upravy
zmeny_upravy
Changes and modifications

...

June , 2015 - implemented Source Flags parameter

Kotva
revizie
revizie
Document revisions

...

Ver. 1.0 - November 22nd, 2007 - document creating
Ver. 1.1 - April 22nd, 2009 - document updating
Ver. 1.2 - June 8th, 2015 - new parameter implemented
Ver. 1.3 – June 15th, 2020: browsing support

Info

title	Related pages:

Communication protocols

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60870-5-101 communication protocol

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Supported device types and versions

Kotva
komunikacna_linka
komunikacna_linka
Communication line configuration

Kotva
komunikacna_stanica
komunikacna_stanica
Communication station configuration

Kotva
linka_parametre
linka_parametre
Line protocol parameters

Kotva
merany_bod
merany_bod
I/O tag configuration

Kotva
tell_cmd
tell_cmd
Tell commands

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Literature

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60870-5-101 communication protocol

Kotvatypy_verzietypy_verzieSupported device types and versions

Kotvakomunikacna_linkakomunikacna_linkaCommunication line configuration

Kotvakomunikacna_stanicakomunikacna_stanicaCommunication station configuration

Kotvalinka_parametrelinka_parametreLine protocol parameters

Kotvamerany_bodmerany_bodI/O tag configuration

Kotvatell_cmdtell_cmdTell commands

KotvaliteraturaliteraturaLiterature

Kotvazmeny_upravyzmeny_upravyChanges and modifications

KotvarevizierevizieDocument revisions

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typy_verzie
typy_verzie
Supported device types and versions

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komunikacna_linka
komunikacna_linka
Communication line configuration

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komunikacna_stanica
komunikacna_stanica
Communication station configuration

Kotva
linka_parametre
linka_parametre
Line protocol parameters

Kotva
merany_bod
merany_bod
I/O tag configuration

Kotva
tell_cmd
tell_cmd
Tell commands

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literatura
literatura
Literature

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zmeny_upravy
zmeny_upravy
Changes and modifications

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revizie
revizie
Document revisions