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S7-1200 Not writing Frequency parameter to V20 over Modbus RTU

Created by: atul.cvs at: 8/25/2023 6:11 AM (3 Replies)

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8/25/2023 6:11 AM	Rate (0)
atul.cvs Posts: 1 Rating: (0)	Hello All I'm very new to siemens & drives. I have successfully communicated V20 drives with S7-1200 over Modbus RTU & I'm able to read the parameters in PLCs over specified address. But when I try to write the frequency on Modbus address 40101. Its not writing frequency to V20 even I don't get any error in my MB_Master block & I get the done bit from MB_Block. (While reading I keep mode 0 & while writing I keep mode 1). Can anyone please guide me what I'm doing wrong here. Regards Atul Sonawane
atul.cvs Posts: 1 Rating: (0)
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8/31/2023 7:27 AM	Rate (0)
Murof Platinum Member Joined: 8/3/2009 Last visit: 12/13/2024 Posts: 14404 Rating: (1799)	Hello atul.cvs here are some general information, perhaps it helps: https://support.industry.siemens.com/cs/ww/en/view/47756141 bye Murof
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8/31/2023 8:19 AM	Rate (0)
qwazee Platinum Member Joined: 3/30/2020 Last visit: 12/14/2024 Posts: 5014 Rating: (1021)	The problem statement does not have enough information to give a focussed guidance. My first instinct is to ask you about the drive configuration. Specifically if the drive is set to use the communication setpoint. But instead of playing the 20-questions game have a look at the following documents. SINAMICS V: Speed Control of a V20 with S7-1200 (TIA Portal) via USS® protocol/MODBUS RTU with HMI Acyclic communication between S7-1200 and V20 via Modbus The documentation that goes with the first link is very complete. PLC and drive sides are documented and also notes on the connections.
	Activities of this user is voluntary. There is no obligation or liability placed on this user. Though optional, your 'please' and 'thank you' is highly valued.
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This contribution was helpful to 1 thankful Users Duris_I

8/31/2023 11:31 AM	Rate (0)
Duris_I Diamond Member Joined: 4/28/2015 Last visit: 12/14/2024 Posts: 10677 Rating: (830)	Hello, atul.cvs Hello All I'm very new to siemens & drives. I have successfully communicated V20 drives with S7-1200 over Modbus RTU & I'm able to read the parameters in PLCs over specified address. But when I try to write the frequency on Modbus address 40101. Its not writing frequency to V20 even I don't get any error in my MB_Master block & I get the done bit from MB_Block. (While reading I keep mode 0 & while writing I keep mode 1). Can anyone please guide me what I'm doing wrong here. Regards Atul Sonawane if I could give next tips here. With write procedure I expect also to have finished all read procedure, set execution on block to false, change parameters and again set execution of block with new parameters set. Simply I expect correct handling of this 2 different procedures because in case of mix and not correct set is then problem. It can be very helpful to give us some screemnshots to see your set parameters for writing procedure, especially from manufacturer doc of device that parameters (address, data type spec) to have better look at your situation. Another good step is always to try test with PC app as MB Client, set required write parameters and do that tests if all is ok. Then it can be better to solve your PLC situation and you can be sure that all is working ok prior do any step on PLC.
	With best regards... Ivan Duris Flight: OMICO
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