Freezing DI524-XC IO

Our system is attached as "devices.jpg". This system works without problems for 5 months. Unfortunately past two days digital inputs on the CI502 are freezing. But digital outputs are not freezing. I can change on-off digital outputs. Digital inputs are not changing when the input signals changes. When I reboot CPU then it comes to normal.

What could be the problem and how can I solve it?

PS. I'm using Automation Builder ver 1.1.2


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asked 1 year ago




how many times has happened the problem?

have you verified that when the problem is occours, at the same time you not have other special events? For example under-over voltage or lightnings?

If you give us more information we can help you better

Flavio Mussolin   

answered 1 year ago


By okankurtkaya on 9/8/2016 | Like (0) | Report

The problem is repating aproximately every two days. We don't have any measuring equipment for under-over voltage or lightnings. Our system is supplied from an online UPS.
On the other hand I have updated the last firmware for CPU and Profinet Master Controller. But again this problem haas occured.

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sorry for the delayed answer. You can check in Codesys - Task configuration - how is set the task attributes, typically cyclic or freewheling.

If you have actual freewheling type selected, you can test with cyclic mode and adjust progressively the cycle time, starting for example with t#200mS - increasing step of 20 mS - and monitoring if different timing conditioning the PLC and the freezing mistake.

Hope this help you, let us know about the results

Flavio Mussolin   

answered 1 year ago


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