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40
Preliminary Operating Considerations
Response to Slot Disabling
Publication 1746-UM614B-EN-P - September 2007
By writing to the status file in your modular SLC processor you can
disable any chassis slot.
Refer to your SLC programming manual for the slot disable/enable
procedure.
Always understand the implications of disabling the module
ATTENTION
before using the slot disable feature.
Input Response
When the slot for this module is disabled, the module continues to
update its inputs. However, the SLC processor does not read from a
module whose slot is disabled. Therefore, inputs appearing in the
processor image table remain in their last state, and the module's
updated inputs are not read. When the processor re-enables the
module slot, the current state of module inputs are read by the
controller during the subsequent scan.
Output Response
When the slot for this module is disabled, configuration words in the
SLC processor's output image table are held in their last state and not
transferred to the module. When the slot is re-enabled, output image
table words are transferred to the module during the subsequent scan.
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