Rockwell Automation 1746-NT4 Series B,D17466.6.1 SLC 500 4-Channel Thermocouple/mV Input Module User Manual - Manual (Page 52)

Publication 1746-UM007C-EN-P - July 2004
4-10 Preliminary Operating Considerations
Response to Slot Disabling By writing to the status file in your modular SLC processor you can
disable any chassis slot. Refer to your programming device‘s manual
for the slot disable/enable procedure.
Input Response
When a thermocouple slot is disabled, the thermocouple module
continues to update its input image table. However, the SLC processor
does not read inputs from a module that is disabled. Therefore, when
the processor disables the thermocouple 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 thermocouple module output data
(configuration) as it appears in the processor output image. However,
this data is not transferred to the thermocouple module. The outputs
are held in their last state. When the slot is re-enabled, the current
data in the processor image is transferred to the thermocouple
module.
ATTENTION
Always understand the implications of disabling a
thermocouple module before using the slot disable
feature.