Good day. We have a CPU 317T-3 PN/DP controller. Recently, the following error has started to appear frequently: "Integrated technology: STOP by execution system, cause: Timeout (user must parameterize cycles differently)".

Please tell me what this error could be related to and how it can be diagnosed?

Hi there,

the answer above from Technology Team was about S7-1500 motion control, but as you said in the beginning, you have an S7-317T, which is different.

For general information on the timing of the PLC you have, see here: https://support.industry.siemens.com/cs/ww/en/view/30119663/50785477003

Basically all cycles are built on the DP(DRIVE) cycle, which is the cycle of the Profibus where you connected your drives and other hardware for use with motion control to this PLC.

The question now is to which value this is set.

Unfortunately I cannot really tell you exactly where you find this time, I'm writing this all from memory. But go into HwConfig, open the settings of the DP(DRIVE) bus. Then in the dialog you have open now, there is some button with further settings that opens another dialog that contains the cycle time of the DP(DRIVE). Just search around a little, you'll find it.

My personal rule of thumb for setting this time:
There is a button to automatically calculate this time. Press it, then increase this calculated time up to the next value that is a multiple of 0.5. For example of calculation gave 2.35ms, then go to 2.5. If calculation already gave such a number (e.g. 2.5ms), then go for the next higher one that is a multiple of 0.5 (e.g. 3).

Do this, to check if your cycle time was set correctly, or if this was too small anyway. If it was too small, increase it as described above, compile HwConfig, then open S7-Technology and also do a save and compile there. Then download all to the PLC again (HwConfig as well as S7-Technology). Then check if the issue appears again.

On a side note:
Does this error appear just now on an already running machine, or is this a new one (or had changes to the HwConfig or Technology)?
I can hardly imagine that the machine was running fine but then this error just comes up out of nowhere after months or years....

Regards,
daviso

Hi there,

the set cycle time seems fine to me then. Too large is not really a problem, only too short. I only wonder about the rather large To-Time of 1ms, but again, I don't really have an idea why this should be an issue and cause such errors.

My suggestion:
Open a support request with Siemens (https://support.industry.siemens.com/cs/my/src?lc=en-de), provide the project and diagnostic buffer as well as information on the firmware version used on the PLC, then see what the experts say about this.

Regards,
daviso