Rockwell Automation Logix5000 Controllers Tasks, Programs, and Routines Programming Manual - Manual (Page 43)

Manage event tasks Chapter 2
The event task uses the following logic to control the diverter.
If Diverter_Photoeye = 1 (part is in the diverter position)
and Divert_Part = 1 (divert this part)
then Diverter = 1 (turn on the diverter)
otherwise Diverter = 0 (turn off the diverter)
Immediately send the output values to the output module in slot 5.
Estimate throughput
To estimate the throughput time from input to output (screw to screw), use the
following worksheet.
Consideration Value
1. What is the input filter time of the module that triggers the event task? µs
This is typically shown in milliseconds. Convert it to microseconds (µs).
2. What is the hardware response time for the input module that triggers the event task? µs
Make sure you use the appropriate type of transition (Off → On or On → Off). See Nominal hardware response times for
the 1756 I/O modules most commonly used with Event tasks later in this section.
3. What is the backplane communication time? µs
If chassis size is Use this value (worst case)
4 slot 13 µs
7 slot 22 µs
10 slot 32 µs
13 slot 42 µs
17 slot 54 µs
4. What is the total execution time of the programs of the event task? µs
5. What is the backplane communication time? (Same value as step 3.) µs
6. What is the hardware response time of the output module. µs
7. Add steps 1...6. This is the minimum estimated throughput, where execution of the motion planner or other tasks do not delay or interrupt the
event task.
µs
8. What is the scan time of the motion group? µs
9. What is the total scan time of the tasks that have a higher priority than this event task (if any)? µs
10. Add steps 7...9. This is the nominal estimated throughput, where execution of the motion planner or other tasks delay or interrupt the event task. µs
Rockwell Automation Publication 1756-PM005-EN-P - October 2014 43