Rockwell Automation 1732E-OB8M8SR EtherNet/IP Dual Port 8-Point SOE Input and Scheduled Output Modules UM - Manual (Page 92)

82 Rockwell Automation Publication 1732E-UM003B-EN-E - March 2014
Chapter 10 Use the Sequence of Events Input and Scheduled Output Modules
Due to the limit of 16 schedules supported by the 1732E-OB8M8SR module,
some constraints are applied to the number of events that can be processed every
coarse update period.
Only eight schedules are available each coarse update. This allows for two
consecutive coarse updates in which each update contains eight output events.
The following diagram illustrates the relationship between the coarse update
period, a cam latch event and the time slots.
Inter-relationship of Coarse Update Period, Cam Latch, and Time Slots
Each Time Slot stores the information described in the following table.
Time Slot Information
Topic Description
Latch Event Mask When a latch event is detected, the time slot in which it belongs is
calculated and the bit in the Latch Event Mask corresponding to
the output bit of the latch is set.
Unlatch Event Mask When an unlatch event is detected, the time slot in which it
belongs is calculated and the bit in the Unlatch Event Mask
corresponding to the output bit of the unlatch is set.
Interval The time in micro-seconds from the start of the coarse update in
which the Latch or Unlatch event occurs.
Pulse Off Mask For pulsed outputs, the time slot in which a pulse off event is
calculated and the bit in the Pulse Off Mask corresponding to the
output bit of the pulse event is set.
Output On Mask For normal outputs, the bit corresponding to the output bit of the
Latch or Pulse On event is set indicating that the output is to be
turned on for these events.
For inverted outputs, the bit corresponding to the output bit of the
Unlatch or Pulse Off event is set indicating that the output is to be
turned on for these events.
Coarse Update Period (10 ms)
Time Slot assignment for each
slot event
Interval = 5000 uSec
Latch position
Cam element
Coarse updates are divided into 16 time slots.
For 10 ms updates, each time slot is 625 uSec