Rockwell Automation T3468A ICS Regent DC Guarded Digital Output Modules - Manual (Page 17)

(T3461A, 62A, 68A) DC Guarded Digital Output Modules
P D - 6 0 1 9 M a r - 0 6
17
To program fault tolerant outputs two output coils driven by
the same control logic are used as shown in Figure 11.
Figure 11. Programming Fault Tolerant Outputs.
In this illustration A, B, C, D represent various logic elements
used to drive the outputs; XV103A represents the output on
one Guarded output module; and XV103B represents the
output on the other Guarded output module.
Maintenance
No periodic maintenance or calibration is required for this
module.
Fuses can be removed and replaced without removing the
module from the I/O chassis. Turning the fuse holder one-
quarter turn from its locked position releases the fuse holder,
extending the fuse and allowing it to be removed.
To prevent damage to the module, replacement fuses must be
of the same rating and type (see Specifications, below).
Safety Considerations
The DC Guarded output modules are TÜV certified to Risk
Class 5 for safety critical outputs. The modules are approved
for de-energize to trip safety critical outputs in single or dual
module configurations.
The modules are also approved for energize to trip safety
critical outputs in dual module configuration only if the
outputs are dynamically transitioned at a period not greater
that six months (to verify the signal wiring and load device
integrity).