2 AB PLC connectivity

[MUITECstudent 0]

I am starting a project involving 2 plcs. One (a remote plc) must be a SLC/05, however the other one (main plc) may be a contrologix. The main plc will have 60 Analog I/O and around 300 Digital I/O. Are these two easily compatible over an AB datahighway? The logic between the two is interlocked in both directions. If so, what type of communication protocol would be best?

[paulengr 44]

The fact that you said "datahighway" automatically locks in the protocol...DF-1. You can't change this. You write everything with MSG statements. SLC and PLC-5 natively implement DH+ and DH-485. ControlLogix can do it via a DHRIO card in the rack. The number of I/O's is not a problem as long as you respect bandwidth limitations of what you are trying to do. For instance, you aren't going to get <10 ms responses over DH+ no matter how hard you try.

[MUITECstudent 0]

The communication between the SLC/05 and the main PLC can be any type of protocal we want, it doesn't have to be a datahighway like DH+. Can you communicate over ethernet between the two?

[BobLfoot 302]

SLC 5/04 - DH485, DH+, RIO, DeviceNet and ControlNet comms possible Ethernet requires Net-Eni Device SLC 5/05 - DH485, RIO, DeviceNet, ControlNet and Ethernet comms possible. DH+ not an option. PLC 5 - DH485, DH+, RIO, DeviceNet, ControlNet and Ethernet all possible comms. Controllogix - DH485, DH+, RIO, DeviceNEt, ControlNet and Ethernet all possible comms. Choice will need to be determined based on Data Volume and response times.