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G120C profinet control with frequency

1/9/2013 10:42 AM	Rate (1)
rQx Bronze Member Joined: 12/9/2010 Last visit: 5/27/2025 Posts: 165 Rating: (5)	Hi! As I understand you control the speed of the motor with RPM on the G120C. Is it possible to do this control with frequency instead? If so, how do I paramertize this? /Tim

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1/10/2013 5:26 AM	Rate (0)
JWilson Experienced Member Joined: 9/16/2008 Last visit: 5/7/2025 Posts: 60 Rating: (3)	So from your S71200 or profinet, you want 0 to 60 (plc code) to equal 0 to 60 hz (0 to 16384) at g120 ?

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1/10/2013 10:23 AM	Rate (0)
rQx Bronze Member Joined: 12/9/2010 Last visit: 5/27/2025 Posts: 165 Rating: (5)	Not exactly I may have been to unspecific in my question. My customer have an PLC, HMI and manual that is build with another manufactor then siemens. He wants me to build a new cabinet with siemens and use the same manual. With other words, he wants it exactly as the old one. However, in the HMI he specifies what JOG value he wants using Hz. This is no problem if he would only use 50Hz motors, but they also use 60Hz motors and this is my problem. If I would send a JOG speed from the HMI of 20Hz to my plc. I will calculate that this is 40% of 50Hz and send 40% of 16384 to the freq. However when he use 60Hz motors the PLC doesn't know that, I've tried to find a way to send a word containing the motor Hz to the PLC with out any success. If I would have built it myself from scratch I would in the HMI specify wich motor frequency it is and send it to the PLC but now I can't. The same problem is when I shall send the ACTUAL frequency of the converter from FREQ->PLC->HMI. For this the PLC must know the MOTOR frequency.

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1/14/2022 8:40 AM	Rate (0)
redsky_tr Member Joined: 4/22/2021 Last visit: 2/27/2025 Posts: 61 Rating: (0)	Can anyone share information on the subject?

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1/14/2022 11:27 AM	Rate (0)
humperdoo Experienced Member Joined: 4/28/2015 Last visit: 7/2/2025 Posts: 102 Rating: (4)	Sending Hz from drive to plc is easy. You need a configurable telegram. For example telegram 20 has its 6th transmit word freely configurable, you can set it to output frequency (r66). Not sure if the value is scaled or exact, have to see for yourself. Drive only accepts a percentage value of speed scaled to rpm, so you will have to do some math in the plc so it shows up as Hz in the HMI input field. Send 100% (16384) if you want to run on 50Hz or 120% (19660?) if you want to run on 60Hz. Edit: Running a 60Hz motor on a drive configured for 50Hz without changing parameters (rated motor frequency) and recalculation is pretty much an experiment.
	Last edited by: humperdoo at: 01/14/2022 11:47:47
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