10/15/2020 5:05 PM | |
Joined: 9/27/2006 Last visit: 9/23/2024 Posts: 12282 Rating: (2685) |
Hello mumair; On a MM440, pins 29 and 30 are reserved for RS 485, but specifically for USS protocol communications: https://support.industry.siemens.com/cs/ww/en/view/12462284 https://support.industry.siemens.com/cs/us/en/view/22423773 https://support.industry.siemens.com/cs/us/en/view/5734889 What CPU are you using to control and communicate with the drive? If it is a S7-1200, you could use the USS_RPR instruction to read different parameters for Current (r0027)and Voltage (r0025) from a MM440: https://support.industry.siemens.com/cs/ww/en/view/109772940/72829762187 Hope this helps, |
Last edited by: dchartier at: 10/15/2020 17:33:05Last edited by: dchartier at: 10/15/2020 21:26:01 |
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10/17/2020 2:59 PM | |
Posts: 31 Rating: (0) |
Thanks Sir for your repky. The links will help me in future work. Right now, I am not using any PLC, all I have 2 Siemens motors and 2 VFDs. Both Motors and VFDs are working independently, and they have no connection in between. Right now, all I want is that, the voltage, current and rpm displayed on VFD to be displayed in some other place where I have a 20 x 4 mono LCD which is cibtrolled by some microcontroller. I have RS 485 to RS232 converters etc, which can help me to send and convert the data. I am unable to find relevent data and information regarding this. Kindly help me out.
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10/17/2020 3:47 PM | |
Joined: 9/27/2006 Last visit: 9/23/2024 Posts: 12282 Rating: (2685) |
Hello mumair; I am afraid that to use USS on the RS 485 terminals you mention you need either a PLC, or some kind of microcontroller-based system that is programmed for USS exchanges. Can you connect your system to the analog outputs of the MM440, if yes you could configure 2 analog outputs to provide voltage and current information from the drive. See this discussion for more information: https://support.industry.siemens.com/tf//ww/en/posts/mm440-analog-output/44475?page=0&pageSize=10 Hope this helps, Daniel Chartier |
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