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Chapter 10
Use the Sequence of Events Input and Scheduled Output Modules
Use the Scheduled Output
Module
74
Per Point operation begins with the selection of the appropriate Timestamp
Format in Studio 5000 Logix Designer software.
Choosing the Per Point Timestamp Format results in an input tag structure
with a single On and Off timestamp value per input point, as well as some
additional general-purpose CIP Sync status tags. It results in the creation of
two additional input tags to assist in timestamp corrections in a CIP Sync
architecture: I:LocalClockOffset and I:OffsetTimestamp.
For more information about Per Point mode, see the ControlLogix Sequence of
Events Module User Manual, publication 1756-UM528.
The Latch checkbox latches CIP Sync timestamp so that recorded events are
not discarded until you acknowledge them. As a result, if latching is selected
and new events occur, they will be ignored until the existing event is
acknowledged.
The Motion Axis Output Cam (MAOC) instruction offers the functionality to
set and reset output bits based on an axis position.
IMPORTANT
When using the 1732E-OB8M8SR module with the MAOC instruction, make
sure that you are using Studio 5000, version 21 or later. You must also
select Yes for MAOC support and Per Point under Time Stamping.
Usage with MAOC Instruction
When used with motion and the MAOC instruction values in the output image
are controlled by the Motion Planner firmware in the controller, the Motion
Planner triggers the data to be sent to the module. Although, the normal
program/task scan also triggers data to be sent to the module. Data integrity is
maintained by the firmware always setting the sequence count for a given
schedule last.
When a programmed on or off event is detected, a schedule is sent to the
output module to turn the output on/off at the appropriate time within the
next coarse update period.
The Output Cam instruction divides the coarse update period into sixteen time
slots. For example, a coarse update period of 2 ms will yield sixteen 125 μs time
Rockwell Automation Publication 1732E-UM003D-EN-E - November 2021
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