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S7 Subnet ID-part 2 (hex)
ParameterMeaningUnit / sizeDefault value
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rack
rack
Rack
Siemens Simatic rack number.0 to 70
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slot
slot
Slot
Siemens Simatic slot number.0 to 310

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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 True0x0 to 0xFFFF0

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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 True0x0 to 0xFFFF0

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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

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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 TSAP.
0x0 to 0xFF3
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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 0xFFFF0x1000
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srcref
srcref
Source Reference
ISO Source Reference. Value of SRC-REF during the initialization of ISO Connection-request.0 to 655351
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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:Short remote TSAP has the following format: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:
-False
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mpiaddr
mpiaddr
MPI/Profibus Address
MPI/Profibus address sent as a part of Remote TSAP, if parameter Use long TSAP is set to True0 to 1261








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s7sub1s7sub1
S7 Subnet ID-part 1 (hex)
S7 subnet address sent as a part of Remote TSAP, if parameter Use long TSAP is set to True0x0 to 0xFFFF0
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s7sub2s7sub2S7 subnet address sent as a part of Remote TSAP, if parameter Use long TSAP is set to True0x0 to 0xFFFF0
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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 bytes1024 bytes
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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 41
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ct
ct
Cycle Time
The required time of one data reading cycle.ms1000 ms
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wt
wt
Message Timeout
Maximal wait time on a reply from the device.ms2500 ms
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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.ms20 ms
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rd
rd
Reconnect Delay
Delay before reconnection to the device if the connection has failed or some communication error has occurred.sec.ms2 sec
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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.ms20 sec

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pdu
pdu
S7 PDU Size

Maximum PDU in bytes at S7 communication with the device.240, 480, 960 bytes480 bytes

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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
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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/NONO
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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/NONO
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rdd
rdd
Debug Requests Info
Activates a basic debug info about requested data.YES/NOYES
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rad
rad
Debug Answers Info
Activates a basic debug info about received packets.YES/NOYES

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