CTI 2500-RIO-B Installation and Operation Guide V1.4
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APPENDIX B. I/O “SAFE STATE” OPERATION
The 2500-RIO-B Remote Base Controller is designed to place the I/O on its base into a “safe
state” on the occurrence of various kinds of system failures involving the PLC processor and
communications cabling. The safe state for the I/O depends on the setting of the FREEZE jumper
(see Section 2.4).
The following situations will cause the outputs go to the safe state:
1.
When the PLC goes to fatal error, all remote bases go to the safe state.
2.
When you pull a cable at the RIO-B, single base
3.
When you send any of the three software restart commands (partial restart, complete restart, power
up restart). All remote bases go to the safe state.
4.
When you trigger RIO-B diagnostics to a system that is not a dual RIO-B configuration.
5.
When you have an enabled and configured base and then you disable it.
6.
When you have an enabled and configured base that is not a dual RIO-B configuration and then
“clear base”
7.
When you extract the active RIO-B from a dual rack configuration.
