Rockwell Automation T7485 ICS Regent+Plus Isolated Guarded Output Modules - Manual (Page 12)

Isolated Guarded Digital Output Module (T7485)
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Industrial Control Services
Resistive Loads
If resistive loads are applied, the isolated Guarded output
module may erroneously annunciate a module fault. This will
occur with a single, fail-safe module configuration. In dual
module configurations, no erroneous faults will be
annunciated until one of the two modules has a fault or is
removed. In either configuration, the outputs will always be
controlled on and off correctly; however, the testing of the
output module’s circuits will not be sensed correctly by the
module and it will report output circuit faults.
Other output module types should be used for safety critical
load devices that have resistive load characteristics.
DC Voltage, Low Current Applications
DC applications with low current loads (Iout < 100 mA) and
long field wiring lengths (Ltotal > 2000 feet) may also cause
erroneous fault annunciation and should be avoided. Other
output module types should be considered for these
applications.
Field Wiring
For field wiring details, refer to PD-7901 - I/O Termination
Assembly (ITA).