Troubleshooting And Optimization - Siemens SIMATIC ET 200pro Manual

Commissioning
5.5 Using QuickConnect
5.5.4

Troubleshooting and optimization

Delayed connection time
Many factors can cause the controller connection time to be slower than expected. These
factors include the following:
● RPI (I/O cycle time)
● Time slice percentage
● Timer set in the application logic
● EtherNet/IP traffic
● Controller task load
If you cannot achieve optimum connection time with the recommended settings, you may
need to evaluate alternate EtherNet/IP configurations or controller requirements.
Timing errors
Once you initially configure your system, you should test whether the connection timing is
within your required timeframe. A QuickConnect I/O device issues a gratuitous ARP
message on the network every 25 ms for a maximum of 40 times (1 second) until an I/O
connection is established. If you experience periodic missed connections, it is recommended
that you:
● Analyze network traffic for the root cause.
● Extend the timer in your application logic to a value greater than 650 ms if necessary.
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ET 200pro distributed I/O EtherNet/IP interface module
Manual, 03/2016, A5E32861915-AB