SSCP serial server settings

More PLCs can be connected over a serial line. This is useful at sites where only serial cabling is available, such as at refurbishments. In the PLC which acts as a TCP to serial router, in the PLC setting a unique SSCP address (link address) must be set, “Enable Serial Router”, “Serial Router Port”, and “Serial Router Baudrate”.

The serial port must not be used for any other purpose, such as communication to I/O modules.

Upload the configuration to PLC, right click the PLCPLC Operation → PLC Setup → Upload configuration to PLC. Upload the configuration over UDP broadcast, and restart the PLC.

SSCP serial server settings

In the PLCset over the TCP connection a unique “SSCP Address” (link address), “Enable Serial Server”, “Serial Server Port” and “Serial Port Baudrate”. Each PLC on the serial line must have an unique SSCP link address..

The serial port must not be used for any other purpose, such as communication to I/O modules.

Upload the configuration to PLC, right click the PLCPLC Operation → PLC Setup → Upload configuration to PLC. Upload the configuration over UDP broadcast, and restart the PLC.

PLC debugging over serial line

In the parameters for connection to PLC, keep the TCP connection type, and set the router IP address, and SSCP address which was set up in the serial servers. If the incoming packets are damaged or bad, make sure the RS485 line is terminated properly.

Topology for more PLCs as serial servers:

Example of configuration for the above topology. The PLC types are as follows: PLC1: Mark125, PLC2: Mark320, PLC3: IMIO105

Parameter

PLC1 - serial router

PLC2 - serial server

PLC3 - serial server

Connection parameters

Server

192.168.1.11

192.168.1.11

192.168.1.11

Network settings

IP address

192.168.1.11

192.168.1.12

192.168.1.13

SSCP parameters

SSCP address

1

2

3

Serial server enable

False

True

True

Serial server port

not important

COM3 (485)

COM1 (485)

Serial server baudrate

not important

11520

11520

Serial router enable

True

False

False

Serial router port

COM1 (485)

not important

not important

Serial router baudrate

115200

not important

not important