User manual

28 Publication LOGIX-AP010B-EN-P - May 2010
Chapter 1 Controllers and I/O Modules
If the S5 I/O must be maintained temporarily, communication modules for
the CompactLogix range can connect to all sorts of networks (such as Profibus
DP). Suppliers of ControlLogix communication modules for third party
networks usually provide communication modules for the CompactLogix
platform, too. For more details, please examine the encompass partner
websites. See Appendix A for available communication modules for the
ControlLogix platform with similar functionality as the CompactLogix
modules.
ControlLogix controllers
To limit migration risks, a phased migration can be done where the S5
controller is replaced by a ControlLogix controller, but where the S5 I/O
(local S5 rack, S5 extension racks, S5 remote racks) is maintained temporarily.
This approach allows for fast rollback scenarios and for shorter development
cycles; that is, no installation, wiring, and testing of field I/O is required. The
S5 I/O can be phased out gradually once the new controller is running.
Integrating the S5 hardware in the Logix architecture is possible through these
three communication methods:
• I/O in local rack/extension rack
To be able to communicate with these I/O cards, they must be made
available to a network. Therefore, new Profibus DP communication
cards can be slotted in the S5 chassis to make each chassis available to
the Profibus DP network. In the local (main) rack, simply replace the
controller by a Profibus DP slave module. In the extension racks also
replace the proprietary interface card by a Profibus DP slave module.