Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 62)

Publication 1746-UM008B-EN-P - December 2006
62 Preliminary Operating Considerations
Input Response
When a RTD slot is disabled, the RTD 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 RTD module slot, the module inputs appearing in the
processor input image 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 RTD module output data
(configuration) as it appears in the processor output image. However,
this data is not transferred to the RTD module when the slot is
disabled. The outputs are held in their last state. When the slot is
re-enabled, the data in the processor image is transferred to the RTD
module.