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Parameter

Meaning

Unit / size

Default value

Kotva

	rack
	rack

Rack

Siemens Simatic rack number. Rack 0 is most often used.

0 to 7

0

Kotva

	slot
	slot

Slot

Siemens Simatic slot number. Slot 2 is most often used.

0 to 31

0

Kotva

	s7sub1
	s7sub1

S7 Subnet ID-part 1 (hex)

S7 subnet address sent as a part of Remote TSAP , if parameter Use long TSAP is set to True

0x0 to 0xFFFF

0

Kotva

	s7sub2
	s7sub2

S7 Subnet ID-part 2 (hex)

S7 subnet address sent as a part of Remote TSAP , if parameter Use long TSAP is set to True

0x0 to 0xFFFF

0

Kotva

	us
	us

Use Secondary

The parameter allows the use of redundant PLCs, which may differ in the settings of some parameters (Rack, Slot, S7 Subnet ID).

If its value is True, the primary and secondary parameters are used alternately when connecting to the PLC using the specified IP addresses.

-

False

Kotva

	conres
	conres

Connection Resource (hex)

Connection resource, it enters as MSB byte to the calculation of the value of Remote TSAP at initialization of ISO Connection-request.
See the description of parameter Use long TSAPlong TSAP.
Note: in the specific case, when two systems (one of them D2000) needed to communicate with S7-300, they each had to have a different Connection resource, otherwise after sending the initial sequence of D2000 KOM process, the connection broke:

/TSK1/Sending CR-TPDU: CLASS=0, SRC-REF=0x0001, TPDU size=1024, SRC-TSAP=10-00, DST-TSAP=03-02
/TSK1/OUT-<03><00><00><16><11><E0><00><00><00><01><00><C0><01><0A><C1><02><10><00><C2><02><03><02>
recv error '10.94.11.237:102 (handle: 2888, objId: 2563271)' - WSA_ECONNRESET [ 10054] Task: L.N337-S7ExecTsk/TSK1/

After changing the Connection resource from 3 to 2, the communication started working.

0x0 to 0xFF

3

Kotva

	ltsap
	ltsap

Local TSAP (hex)

ISO Local TSAP (Transport Service Local Point). Source TSAP value during the initialization of ISO Connection-request.
See the description of parameter Use long TSAP.

0x0 to 0xFFFF

0x1000

Kotva

	srcref
	srcref

Source Reference

ISO Source Reference. Value of SRC-REF during the initialization of ISO Connection-request.

0 to 65535

1

Kotva

	ult
	ult

Use long TSAP

Enables a long format of local and remote TSAP which is sent during the connection setup phase.
Short TSAP is 2 bytes long.
Short local TSAP has the following format:

1. byte - higher byte of parameter Local TSAP
2. byte - lower byte of parameter Local TSAP

Short remote TSAP has the following format:

1. byte - the value of parameter Connection Resource
2. byte - combination of parameters Rack * 32 + Slot

Long local TSAP is 28 bytes long. Last 2 bytes are higher and lower byte of parameter Local TSAP
Full remote TSAP is 28 bytes long and it contains:

5. byte - higher byte of parameter S7 subnet ID-part 1
6. byte - lower byte of parameter S7 subnet ID-part 1
9. byte - higher byte of parameter S7 subnet ID-part 2
10. byte - lower byte of parameter S7 subnet ID-part 2
11. byte - the value of parameter MPI/Profibus Address
27. byte - the value of parameter Connection Resource
28. byte - combination of parameters Rack * 32 + Slot

-

False

Kotva

	mpiaddr
	mpiaddr

MPI/Profibus Address

MPI/Profibus address sent as a part of Remote TSAP, if parameter Use long TSAP is set to True

0 to 126

1

Kotva

	tpdus
	tpdus

ISO TPDU Size Variable Parameter

The maximum required size of ISO TPDU. The parameter value the initialization of ISO Connection-request.

8192, 4096, 2048, 1024, 512, 256 or 128 bytes

1024 bytes

Kotva

	pnj
	pnj

Nr. of Parallel Network Threads

Maximum parallel communication threads. Increase the value if there is a request on more data read from the device in a shorter time.

1 to 4

1

Kotva

	ct
	ct

Cycle Time

The required time of one data reading cycle.

ms

1000 ms

Kotva

	wt
	wt

Message Timeout

Maximal wait time on a reply from the device.

ms

2500 ms

Kotva

	imd
	imd

Inter Message Delay

Delay which is used before sending a data request. When a high data transfer rate is required, set 0 ms.

sec.ms

20 ms

Kotva

	rd
	rd

Reconnect Delay

Delay before reconnection to the device if the connection has failed or some communication error has occurred.

sec.ms

2 sec

Kotva

	cet
	cet

Connection Error Timeout

When Timeout passes and communication error occurs in all threads, a communication error status is set on the stations. FALSE state is set on the communication line.

sec.ms

20 sec

Kotva

	pdu
	pdu

S7 PDU Size

Maximum PDU in bytes at S7 communication with the device.

240, 480, 960 bytes

480 bytes

Kotva

	tnd
	tnd

Tcp No Delay

Setting Tcp No Delay parameter causes low-level socket option TCP_NODELAY to be set, thus turning off the default packet coalesce feature.

-

False

Kotva

	nvd
	nvd

Debug Values

Activates a debug info about the loaded values of I/O tags. Use this parameter only when communication must be debugged because it highly uses CPU and slows down the communication.

YES/NO

NO

Kotva

	iopd
	iopd

Debug I/O Binary Packets Info

Activates a debug info about a binary content of packets. Use this parameter only when communication must be debugged because it highly uses CPU and slows down the communication.

YES/NO

NO

Kotva

	rdd
	rdd

Debug Requests Info

Activates a basic debug info about requested data.

YES/NO

YES

Kotva

	rad
	rad

Debug Answers Info

Activates a basic debug info about received packets.

YES/NO

YES

...

;

Optional parameter. It disables the I/O tag from communication, stops I/O tag address check when it is saved and can be useful when the communication with the device is activated or debugged.

S7:[connectionname]

Optional parameter. It does not contain any useful information but it is supported only because of backward compatibility with Siemens SimaticNET OPC server.

DB

Data block. S7 variable identifier from "Data block".

DI

Instance data block. S7 variable identifier from " Instance data block".

<no>

A number of "data block" or "instance data block".

<object>

Specification of block or area in S7 PLC.

Possible values:

Value

Description (German name)

I

Input (Eingang, E)

Q

Output (Ausgang, A)

PI

Peripheral Input ( Peripherie Eingang, PE)

PQ

Peripheral Output ( Peripherie Ausgang, PA)

M

Memory bit (F)

C

Counter (Zähler, Z) - BCD coded integer numbers <0-999>

T

Timer (Timer, T) - BCD coded time values from intervals <0.00-9.99>, <00.0-99.9>, <000-999>, <0000-9.9990>

Kotva

	szl
	szl

S

System Status Lists (System-ZustandsListen, SZL) - lists with diagnostic information that are available on CPU family S7-300 and S7-400. Diagnostic information differs for various classes of PLC and details are described in manuals (e.g. System Software for S7-300/400 System and Standard Functions, Volume 1/2)
Note: I/O tag S must be of TxtI type.

<type>

Data type of S7. It is not specified for T, C and S objects.

Identifier <type>	Description
X	Bit (boolean). Specify a bit number 0 to 7 - e.g. DB9,X8.3
B	Byte (8 bits unsigned).
W	Word (16 bits unsigned).
D	Double word (32 bits unsigned).
CHAR	Character (8 bits signed).
INT	Integer (16 bits signed).
DINT	Double integer (32 bits signed).
BCD	BCD-coded 2-byte number (0-9 999)
LBCD	BCD-kódované 4-byte number (0-99 999 999)
REAL	Floating point number (32 bits according to IEEE754 standard).
LREAL	Long floating point number (64 bits according to IEEE754 standard).
STRING	String. Specify maximal length of string.
CHARARR	Array of CHARs interpreted as a string. Array length must be specified.
DT	Date and Time, 8 bytes in BCD format.
TIME	Time (32 bits signed) in ms. Note: if the I/O tag is of the TiR type, it is necessary to ensure the conversion by configuring the linear conversion (A=0.001, B=0) on the Conversion tab
TOD	Time of day (32 bits unsigned) in ms.

Note: The CHARARR type is a D2000 extension that allows you to read/write an array of CHARs as a string. This type is not compatible with the Siemens SimaticNET OPC server addressing.
The difference between CHARARR and STRING is as follows:

STRING - standard format of the S7 string, when there are 2 bytes in front of the string itself (maximum and current string length). For example, a 10-character STRING takes up 12 bytes.
CHARARR - array of characters, without a 2-byte header. For example, CHARARR with a length of 10 characters takes up 10 bytes.

<address>

Address of variable. Possible types:

Byte offset (offset within a block, a number 0-65535)
Byte offset.bit (only for X data type, bit number in the range of 0 to 7)
Byte offset.String length (only for STRING data type, string length from 1 to 254 characters)
Id.Index[.StringOffset[.StringLength]] - only for object S (system status list):
- Id and Index are 16-bit numbers in range 0-65535 defining ID of specific system status list and index of item in this list
- StringOffset and StringLength are byte offset (0..65535) and length (1..65535) of substring in answer, which will be parsed as a value of I/O tag.
Example: address S237.1.10.20 represents status list 237 (0x0111), index 1 (Identification of the module). S7-300 will answer to this request by a 36 byte-long string (bytes 0..35) in which bytes 10..29 (i.e. offset=10, length=20) represent "Order number of the module", e.g. '6GK7 342-5DA02-0XE0 '.

Example of addresses:

DB10,W35
DB8,X10.0
DB1,REAL12
DB5,STRING5.14
DB5,CHARARR5.14
T20
C7
MB11
MDINT30
QX3.7

<items>

number of elements for structured I/O tags with configured Destination column. Every read element (1,2,3 .. items) will be written to one item of destination column.
Structured I/O tags are not supported for objects of type T (timers), C (counters) and S (system status lists) nor for data type STRING.
Note: All items elements are read at once. If e.g. 100 elements of type D (double word) are configured, it means reading of a block of 400 bytes. If a smaller size of packet (S7 PDU size) is agreed on during establishment of connection, reading of this I/O tag will not be performed and trace file of line will contain an error message. Agreed S7 PDU size is minimum of size offered by D2000 (parameter S7 PDU Size) and supported size of specific device.
Note: syntax of address when specifying number of elements is compatible with Siemens S7 OPC server (e.g. S7:[MyPLC]DB120,INT1050, 24), which facilitates simple transition from OPC communication to Siemens SIMATIC S7 ISO on TCP protokol by configuring a new line, a new station and then changing parent of I/O tags (e.g. via CSV or XML export and import).

Example of addresses:

DB10,W35, 20 a block of 20 words will be read (i.e. 40 bytes) from addresses 35-54
DB8,X10.0, 100 a block of 100 bits will be read (i.e. 13 bytes) from addresses 10-22

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Ver. 1.0 - September 17, 2010 - Document written.
Ver. 1.1 - July 2, 2020 - Support for CHARARR.
Ver. 1.2 - July 9, 2020 - Support for BCD and LBCD.
Ver. 1.3 - August 27, 2020- Support for Siemens Microbox

Info

title	Related pages:

Communication protocols

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