Spectrum Controls 1746sc-NI8u - Manual (Page 44)

32 SLC 500 ™ Universal Analog Input Module
Response to Slot
Disabling
By writing to the status file in the modular SLC processor, you can disable
any chassis slot. Refer to your SLC programming manual for the slot
disable/enable procedure.
CAUTION
POSSIBLE EQUIPMENT OPERATION
Always understand the implications of disabling a
module before using the slot disable feature.
Failure to observe this precaution can cause unintended
equipment operation.
Input Response
When a universal slot is disabled, the universal module continues to
update its input image table. However, the SLC processor does not
read input from a module that is disabled. Therefore, when the
processor disables the universal module slot, the module inputs
appearing in the processor image table remain in their last state, and
the module’s updated image table is not read. When the processor re-
enables the module slot, the current state of the module inputs are
read by the processor during the subsequent scan.
Output response
The SLC processor may change the universal module output data
(configuration) as it appears in the processor output image.
However, this data is not transferred to the universal module. The
outputs are held in their last state. When the slot is re-enabled, the
data in the processor image is transferred to the universal module.
!