Rockwell Automation 1746-XXXX SLC 500 4-Channel Analog I/O Modules User Manual - Manual (Page 51)

Publication 1746-UM005B-EN-P - June 2004
Module Operation and System Considerations 4-13
Response to Slot Disable
You have the ability to disable any slot in the chassis using the
processor. Before disabling any slot containing an analog module, it is
important to consider how the analog module will respond when the
slot is disabled.
The response to slot disable for inputs and outputs is the same for all
the analog modules.
Input Response to Slot Disable
The module continues to update the input values to the processor.
However, the processor does not read inputs from a module that is
disabled. Therefore, when the processor disables the analog module
slot, the module inputs appearing in the processor image table remain
in their last state. When the processor re-enables the analog module
slot, the current state of the module inputs are received by the
processor during the subsequent scan.
Output Response to Slot Disable
The processor may change the analog module output data as it
appears in the processor image table. However, this data is not
transferred to the analog module.
Instead, the analog module holds its outputs in their last state. When
the slot is re-enabled, the data that appears in the processor image
table is transferred to the analog module on the subsequent scan.
ATTENTION
Make sure that the implications of disabling an
analog module slot are clearly understood before
utilizing this feature.