Motion Event Instructions
Rockwell Automation Publication MOTION-RM002H-EN-P-February 2018 285
Tip:
For the 1756-OB16IS module, outputs 0 to 7 can be forced by forcing the Data Bit
to 0 or 1 and its corresponding bit in the ScheduleMask to 0. For outputs 8 to 15,
only the Data Bit needs to be forced. For the 1732E-OB8M8SR and 1756-OB16IEFS
modules, force outputs 0 to 7 and outputs 0 to 15 in the same manner that you use
for the 1756-OB16IS module.
Due to the limit of 16 schedules supported by the 1756-OB16IS and
1732E-OB8M8SR modules and 32 for the 1756-OB16IEFS module, some
constraints are applied to the number of events that can be processed every coarse
update period.
Only 8 schedules are available each coarse update for the 1756-OB16IS and
1732E-OB8M8SR modules. This allows for two consecutive coarse updates in
which each update contains 8 output events. As a group of 8 schedules are
currently being processed by the scheduled output modules, a second group of 8
schedules can concurrently be set up for the next coarse update.
Similarly, only 16 schedules are available each coarse update for the
1756-OB16IEFS module. This allows for two consecutive coarse updates in which
each update contains 16 output events. As a group of 16 schedules are currently
being processed by the scheduled output modules, a second group of 16 schedules
can concurrently be set up for the next coarse update.
The following diagram illustrates the relationship between the coarse update
period, a cam latch event and the time slots for the 1756-OB16IS.
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