Hello to everyone,

I would like to ask your opinions about a project which we are struggling lately.

There is an hydraulic press system with 1214 cpu controller.

We are trying to integrate another system on it which also using 1214 cpu.

There is two different projects (v14-v17), systems are communicating on profinet and using get commands in projects.

Our system like a rotary table and has a servo.

We are changing our position at every cycle (when hydraulic press comes backward) .  There is an 0-200 pulse encoder on the press which we are determine the press location with that. Encoder configuration is in the press project and it is fine. I just read the current value of encoder with using “get” command.

Everything is fine but there is a major problem. System is too fast (70-80 shoots in a minute) and when i increase the speed, always a problem about catching encoder values of press.

For example, i’ll change the position of rotary table when the press comes home position (enc. Value 0) , but if the speed of system high, we’re unable to catch that encoder value and of course our system failing about getting position change command. (As i said, using get command to read encoder values, using comparator ops. to change the position of our system)

I’ve tried to use interrupts but i’m facing with latency or catch problems againg and again. So i’m expanding the encoder range like 0 to 50 in order to change my position, it works, catches the pulse. But as you see it is not a solid solution for the system.

What is your opinions about this situation ?  Is there any chance to increase that communication performance ? Or is there any other solution which we don’t know ?

Thanks ,

Have a good day.

Use I-Device. On Profinet RT you can get those two S7-1200 exchange data with up to 1ms update time. You can find more info here:

Tip: I-Device IO-Controller communication - 188282 - Industry Support Siemens

You simply configure one of the S7-1200 as an I-Device (maybe the one with the encoder), other S7-1200 is and IO-Controller.

Thanks,

Mirek