| Parameter | Meaning | Unit / size | Default value |
|---|
| Siemens Simatic rack number. Rack 0 is most often used. | 0 to 7 | 0 |
| Siemens Simatic slot number. Slot 2 is most often used. | 0 to 31 | 0 |
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 |
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 |
| 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 |
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.
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 42, the communication started working. | 0x0 to 0xFF | 3 |
| 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 |
| ISO Source Reference. Value of SRC-REF during the initialization of ISO Connection-request. | 0 to 65535 | 1 |
| 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 |
| MPI/Profibus address sent as a part of Remote TSAP, if parameter Use long TSAP is set to True | 0 to 126 | 1 |
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 |
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 |
| The required time of one data reading cycle. | ms | 1000 ms |
| Maximal wait time on a reply from the device. | ms | 2500 ms |
| Delay which is used before sending a data request. When a high data transfer rate is required, set 0 ms. | sec.ms | 20 ms |
| Delay before reconnection to the device if the connection has failed or some communication error has occurred. | sec.ms | 2 sec |
| 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 |
| Maximum PDU in bytes at S7 communication with the device. | 240, 480, 960 bytes | 480 bytes |
| Setting Tcp No Delay parameter causes low-level socket option TCP_NODELAY to be set, thus turning off the default packet coalesce feature. | - | False |
| 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 |
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 |
| Activates a basic debug info about requested data. | YES/NO | YES |
| Activates a basic debug info about received packets. | YES/NO | YES |