Instruction Manual

36 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013
Chapter 2 Module Operation
Output Control
All 16 outputs can be controlled by any of the four counters or by the user’s
control program, via the output mask function. Output states are determined by
count, rate (not supported in packaged controller), ranges, mask configuration
data, overcurrent status, and safe state settings and conditions.
The 16 outputs are made up of four real (physical) outputs and 12 virtual
outputs. The status of the real and virtual outputs is available to the user
program. The real outputs are electronically protected from overloads.
Masks
You can use an Output On Mask or an Output Off Mask.
Output On Mask
Using the Output On Mask, all of the module’s outputs can be turned on directly
by the user control program, like discrete outputs. A bit that is set in the mask
turns on the corresponding real or virtual output.
Output Off Mask
The Output Off Mask has veto power over any output. It can turn any or all of
the module’s outputs off. When a bit in this mask is set to 0, the output will be
turned off. Each bit is logically ANDed with the Output On Mask and masks of
active and enabled ranges. If the bit in this mask is set to 1, the output can be
turned on or off by the ranges, or the Output On Mask. The final result is
available as the Readback.n bit.
IMPORTANT
To turn outputs on, you must use both the Output On Mask and
the Output Off Mask.