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cp243-1 connect to ct unidrive ethernet module

2/9/2013 3:54 AM	Rate (0)
jjjkavie Advanced Member Joined: 6/7/2006 Last visit: 9/17/2025 Posts: 11 Rating: (0)	Hi all I have a question regarding cp243-1 ethernet module connecting to CT unidrive's SM ethernet module. Is it possible? If so how the data exchange between them? I have an application which need exchange double word data between s7-200 and undrive to control servomotor for positioning. Hope I can get some help from experts. Thanks

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2/9/2013 7:11 AM	Rate (0)
umencho Grandmaster Joined: 3/21/2006 Last visit: 1/10/2026 Posts: 10247 Rating: (1183)	It seems that communication between S7-200 andCT unidrive's SM ethernet module must be on Modbus TCP protocol. Unfortunately,CP243-1 does not support the ModbusTCP/IP protocol.You will needRS485/Modbus_tcp gateway (Red Lion's Data Station Plus) Best regards, Hristo Mihalev

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2/9/2013 11:18 PM	Rate (0)
jjjkavie Advanced Member Joined: 6/7/2006 Last visit: 9/17/2025 Posts: 11 Rating: (0)	Thanks for your reply. So you mean I use the communication port of s7-200 to connect to the redlion convertor and then from the convertor to ct unidrive sm ethernet module with enthernet cable. How about connect s7-200 to ct unidive directly with modbus rtu? Can i connect two unidives to one s7-200 at same time with modbus rtu?

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2/9/2013 11:28 PM	Rate (0)
umencho Grandmaster Joined: 3/21/2006 Last visit: 1/10/2026 Posts: 10247 Rating: (1183)	Concerning S7-200 yes, you can use modbus rtu. Librairies of functions for Modbus RTU are available for the S7-200. Where in STEP 7 Micro/WIN can I find the operations libraries for the Modbus RTU protocol and USS protocol? What about the drive?

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2/10/2013 2:43 AM	Rate (0)
jjjkavie Advanced Member Joined: 6/7/2006 Last visit: 9/17/2025 Posts: 11 Rating: (0)	Yes, the drive also support MODBS RTU. Can I use two connections at the same time which mean one s7-200 connect two drives at same time with same modbus rtu?

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2/10/2013 4:18 AM	Rate (0)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 1/16/2026 Posts: 12481 Rating: (2722)	Hello 19630825; Actually the ports on the S7-200 are standard RS-485. So setting up a Modbus RTU multidrop bus is the easiest way to go with a S7-200 CPU, if the drives accept a RS-485 connection. Please validate that from the drive documentation. You should also need to understand the Modbus mapping (variable contents and addressing) of the drive, and the Modbus functions you need to setup in order to read/write to the Modbus registers in the slave). Have a look at this introduction to Modbus, prepared by our friend and forum member smiffy, in case you need to refresh your understanding of the basics of Modbus communication: Modbus General Description As Umencho pointed out earlier, the Modbus libraries are not included in the basic MicroWin software, they must be purchased seperately. How do you implement MODBUS communication with S7-200? Hope this helps, Daniel Chartier
	Last edited by: dchartier at: 2/10/2013 4:19 AM
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