Known Issues
23.
Known Issues
23.1. The Min_OnTime (TOF) timer is used to extend short duration trigger signals to ensure that the ID-40
readers can have their EtherNet/IP triggers forced low (to stop the previous read if still reading), receive
the acknowledgement that the units are no longer triggered, and then trigger the readers for the
new cycle. This requires that the trigger be on for at least 3 times the RPI, which, in this project, is 20
milliseconds, for a total time of 60 milliseconds.
23.2. If the Min_OnTime timer is still executing the 60 millisecond timer and another trigger is received the
new trigger is ignored. Once the 60 millisecond timer has expired a new trigger will be processed.
23.3. All ID-40s must have their trigger set to External Level and the end cycle set to New Trigger for the NJ/NX
controller logic to function correctly.
23.4. On the first trigger after the project is downloaded to the NJ/NX controller, the ReadTime variable will be
reported as 20,000. On subsequent triggers, the ReadTime variable will report the correct Trigger
to Result time in milliseconds.
Appendix A
35
