Rockwell Automation T7488/T7488A ICS Regent+Plus Monitored Guarded Output Modules - Manual (Page 22)

Monitored Guarded Output Modules (T7481/81A, 84, and 88/88A)
2 2 (Issue 2)
Industrial Control Services
Name represents the 16 output fault names. In each module
variable, output 1 is the least significant bit (LSB) and output
point 16 is the most significant bit (MSB).
The module definition names are not normally used for
control purposes. However, they do provide convenient single
name references to all 16 outputs points when reporting
status information to operator interface equipment.
Programming
Outputs are controlled by writing application programs that
solve for output values. For example, placing an output tag
name on a coil in ladder logic will cause the output to turn on
when there is power flow to the coil in the ladder logic rung.
To program fault tolerant outputs two output coils driven by
the same control logic are used as shown in Figure 12.
Figure 12. 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).