94 Rockwell Automation Publication ICSTT-RM448M-EN-P - February 2021
Chapter 5 Install the AADvance System
Field Loop Circuit for 4-Wire Analogue Input
Figure 19 - Wire Analogue Input Field Loop
Analogue Input Slew Tolerance
It is possible during sustained periods of abnormal input current slewing that
channels can be declared faulted as a consequence of diagnostics otherwise
designed to verify that the channels are operating within their designed safety
accuracy.
To avoid spurious declaration of channel faults it is necessary to ensure that
the input signal condition satisfies the maximum slew rate criteria defined in
the Solutions Handbook. Accordingly it may be necessary to condition the
input signal such as by filtering, sensor slew rate configuration or by
appropriate choice of process safety time.