AB-CSP - Allen Bradley CSP Protocol Notes

CSP protocol developed by Allen-Bradley

This is a proprietary protocol developed by Allen-Bradley, Inc. Variants of this are used on Allen-Bradley's SLC 5/05 and PLC-5 controllers. This protocol is also used by the Allen-Bradley's SoftLogix 5 and RSLinx and SoftPLC Corporation's SoftPLC. Allen-Bradley does not publish the specifications for this protocol.

The CSP protocol is also known as "DF1 over Ethernet". It uses the same addressing format and function code types as the serial DF1 protocol. This common component is called PCCC.

CSP can be used to read and write any registers in the RMC. In the Allen-Bradley PLCs, MSG (message) blocks are used to read and write any registers in the RMC using CSP. See Using Allen-Bradley Controllers via Message Block for details.

Supported PCCC function codes:

• Diagnostic Status (06 03)

• Echo (06 00)

• SLC Protected Typed Logical Read with 2 Address Fields (0F A1)

• SLC Protected Typed Logical Read with 3 Address Fields (0F A2)

• SLC Protected Typed Logical Write with 2 Address Fields (0F A9)

• SLC Protected Typed Logical Write with 3 Address Fields (0F AA)

• PLC5 Typed Read (0F 68)

• PLC5 Typed Write (0F 67)

• PLC5 Word Range Read (0F 01)

• PLC5 Word Range Write (0F 00)

 Addressing:

Same as DF1 (serial) - see the DF1 Addressing topic.