Allen-Bradley PLC-3 via TCP/IP

The information included in the following pages describes how to connect the Allen-Bradley PLC-3 devices using the ABTCP protocol to a Plant SCADA system.

Using this method, you can connect to multiple PLCs as in the following diagram:

You cannot make a direct physical Ethernet connection to a PLC-3. An Ethernet Interface (EI) must be provided - typically by using a 5/250 Pyramid Integrator.

The Allen-Bradley Ethernet arrangement requires a BOOTP server. The BOOTP server is required by the AB EI modules to download configuration information. Refer to your Allen-Bradley documentation for BOOTP information.

The diagram above does not show all the possible connection options. Consult your Allen-Bradley manuals for more information.