Rockwell Automation T3485 ICS Regent Isolated Guarded Output Modules - Manual (Page 12)

Isolated Guarded Digital Output Module (T3485)
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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
Field wiring terminal blocks on the I/O chassis are used to
connect power sources and loads to the module. The terminal
blocks are located directly above and below the slot where the
module is installed. Each terminal block consists of ten #6
wire clamp screw terminals capable of holding two 12 AWG
wires.
Each module has two terminals for each output. Each output
can be connected to a load powered from a separate isolated
power source. Figure 7 shows the proper field wiring for a
single module and Figure 8 shows the field wiring for fault
tolerant modules connected in parallel.
For DC voltage applications, make sure the positive terminal
of the power source is connected to the “IN” terminal, else the
module will not be able to detect a blown fuse.
Note: