APPENDIX C – Troubleshooting
OMRON
Page 298
Release 2.0
Most useful is the Address monitor: select the Address tab and double click Monitor. Any CX-
Supervisor PLC ‘Symbol’ (point) can be selected and monitored and set, including Input only points.
CX-Supervisor Performance monitor
The CX-Supervisor Performance Monitor tool displays application and communication information
and can be very helpful in diagnosing performance problems. It is launched by right clicking the
runtime and selecting
Performance…
(if security privileges permit). There are statistics and a
performance trend for each PLC, each network, the CPU time and a Summary and Overview page.
Overview
Shows an overview of the headline performance of all other components.
Summary
Provides a Summary view, totalising and averaging property values from all PLCs on all networks.
CPU Time
Lists specific CPU and process information including processing times for all scripts and all
callbacks.
Network
Totalises properties for all PLCs on each network.
PLC
The ‘PLC Average Latency (ms)’ field shows the physical delay of the network and PLC response
time. Depending on the PLC, setup and network this should be 9-30ms. If this is drastically higher it
could be the cause of performance problems. Try some of the following steps to reduce it:
The ‘PLC Average Latency (ms)’ field shows the physical delay of the network and PLC response
time. Depending on the PLC, setup and network this should be 9-30ms. If this is drastically higher it
could be the cause of performance problems. Try some of the following steps to reduce it:
•
Test on a dedicated network, or if not possible with other nodes disabled. This is to
ensure it is not due to network loading or other external factors.
•
Try with the PLC in ‘STOP’ mode. If this has an impact double-check the PLC settings.
This can vary depending on PLC type, but some require a longer scan rate, so more free
CPU time is available to service the communications, whereas some require a shorter
scan rate so the communications are service more frequently at the end of each scan.
Some other settings may also impact the CPUs ability to service communications.
•
Try to reduce the number of active messages (see below)
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