PLC-5 / SLC – General Information

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This protocol is used for the communication with PLC-5 and SLC PLCs from Rockwell Automation Allen-Bradley.

The PLC-5 / SLC protocol only works in conjunction with TCP/IP.

Read (Fetch active) and Write (Write active):

•	When communicating with SLC or PLC-5 PLCs, it is generally possible to both read and write over a single connection.

•	If default port 2222 is used, you only need to parameterize the connection on the device side. On the PLC side, no other settings are required.

NOTE:

For PLC-5 and SLC communication, a specific PLC-5 / SLC Item Syntax is used.