Hallo,

Does anyone know how to count the minutes an output is set during a 30 days period?

Any simple program would be appreciated. 

Thank you in advance. 

Hi,

you can use instruction RTM - but this only will count hours. If you need minutes, you have to programm something small for you own.

Regards,

Towome

Hmm, it seems that there is not an instruction to evaluate the cumulative time, in seconds, for an enabled output. 

Maybe I should write a simple program for that.

Any advice would be appreciated.

Regards

Hello pallisi;

To add to Towone's post, you could start by looking at the TONR instruction in Step 7 v1x; it is described below (the manual cited is for Step 7 basic v14 SP1, but the instruction exists in earlier versions of TIA Portal):

https://support.industry.siemens.com/cs/document/109747135/step-7-basic-v14-sp1?dti=0&lc=en-WW

TONR: Time accumulator (S7-1200, S7-1500)

Description

You can use the "Time accumulator" instruction to record how long the signal is at the input of instruction "1". The instruction is started when the result of logic operation (RLO) changes from "0" to "1" (positive signal edge). The time is recorded as long at the RLO is "1". If the RLO changes to "0", the instruction is halted. If the RLO changes back to "1", the time recording is continued. The query of the timer status for "1" returns the signal state "1" if the recorded time exceeds the value of the specified time duration and the RLO at the input of coil is "1".

The timer status and the currently expired timer can be reset to "0" using the "Reset timer" instruction.

...

For S7-1200 CPU

The "Time accumulator" instruction stores its data in a structure of the data type IEC_TIMER or TONR_TIME. You can declare the structure as follows:

• Declaration of a data block of system data type IEC_TIMER (for example, "MyIEC_TIMER")

• Declaration as a local tag of the type TONR_TIME or IEC_TIMER in the "Static" section of a block (for example, #MyIEC_TIMER)

You would have to use a signal from your Equipment showing "running" status, as an input tom the timer, with a positive-edge instruction.

Hope this helps,

Daniel Chartier