98 Rockwell Automation Publication ICSTT-RM448M-EN-P - February 2021
Chapter 5 Install the AADvance System
Digital Output 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 field supply voltage and output signal condition satisfies the maximum
slew rate criteria defined in the Solutions Handbook. Accordingly it may be
necessary to condition the field supply voltage or output signal such as by
filtering or by appropriate choice of process safety time.
For further information regarding how the AADvance digital output module
detects field faults, see Knowledgebase Document ID: QA23147 AADvance/
bulletin 1715: Digital output channel diagnostic test.
Connections to T9851/T9852 Digital Output TA — 8 Channel Simplex/Dual
The field element wiring and field power connections are as shown:
NOTE 1. Alternatively instead of fitting two 5A fuses you can use Class 2 power
supplies for the +24 Vdc field voltage. Class 2 is defined by the NEC as
providing less than 100 watts (at 24V).
2. The field power must be wired using 12 AWG wire.
3. The field power must be supplied with an isolating source.
4. The minimum current required for line monitoring is 20mA for a dual
pair.
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