Timers never time out

Ross

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We have a 6ES7 318-3FL01-0AB0, hardware rev 3, firmware rev 3.2.4.

We's just had a very similar problem with timers, following a power failure. Timers that were enabled would never time out. The timer value would just continually cycle around, starting to time down from some meaningless value, above what the timer was set to. Cycling the power didn't help. We resolved this issue by temporarily changing the code to disable the timer, then putting code back the way it should be.

I've just had a look though the corrections in the more recent firmware, but I can't find any mention of this issue being fixed.

Any sugestions?

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 Hello,

Have you checked update forV3.2.6  :

Update V3.2.6 (6ES7 318-3FL01-0AB0)

The above new CPU version does not contain any new functions.

Note on STEP7 dependencies and upward compatibility:
To run this CPU your require STEP7 V5.5 or higher.For CBA configuration you require iMap V3.0 +SP1 or higher. Configurations with earlier STEP7 and iMap versions can be used with upward compatibility.
For failsafe applications you require the optional package S7 Distributed Safety V5.4 + SP1 and higher.
 
Firmware update V3.2.6 provides the following corrections:

• --Modules that have run for approx. 500 days will no longer get stuck sporadically or show endlessly running timers.
• --Cache errors that cannot be corrected and very sporadically occur during CPU startup will now be entered in the diagnostic buffer with defect identifier Z1= F001 and branched to "Defect" status. During startup the CPU can no longer enter a inconsistent state which is sporadically entered in the diagnostic buffer with event ID 16# 4580 (inconsistent backup buffer content).

Perhaps, firmware update will help  you to solve the problem.

I hope these comments help you,

Hamid Hosseini

Thanks, we'll try that.

Morning!

The identified as a bug in the firmware of the cpu which will occur every 500 days. We didn't had the issue anymore since upgrading to 2.8.6 for the 3EL00. I can't remember that we had the issue with any 3EL01. But we all updated them right away because the firmware upgrade that came out for the 3EL00 and the 3EL01 clearly stated the a fix solving the Timer issue. The Problem was not only identiefied for the 319 cpu but for the 315 an 317 as well.

For your CPU this issue is solved in V3.2.6:

Firmware update V3.2.6 provides the following corrections:

• Modules that have run for approx. 500 days will no longer get stuck sporadically or show endlessly running retentive configured timers.