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s7300 and PAC3100

Created by: Oscar_83PL at: 10/8/2010 8:09 PM (2 Replies)

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10/8/2010 8:09 PM	Rate (0)
Oscar_83PL Bronze Member Joined: 10/22/2008 Last visit: 10/14/2024 Posts: 369 Rating: (5)	Hi, I would like to use simple power analyzer PAC3100 and get the data to S7-315. But as I know S7-300 doesn't have modbas libraries. I am right? PAC3100 is only provided with RS485 MODBUS RTU. So i need commucnication module to s7-300 and also not free libraries to that modbas protocol. Am I right? best regards

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10/8/2010 8:28 PM

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dchartier

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Joined: 9/27/2006

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Hello Oscar;
You are right, if you need to communciate with A RS-485 Modbus RTU slave with a S7-300 Modbus RTU master, you will need:
- a CP 341 serial module with a RS-485 interface:

6ES7341-1CH02-0AE0

SIMATIC S7-300, CP341 COMMUNICATION PROCESSOR WITH RS422/485 INTERFACE INCL. CONFIG. PACKAGE ON CD

- a Modbus RTU loadable driver for CP 341 or CP 441-2:

6ES7870-1AA00-0YA0

Modbus Master f. CP341/CP441-2

Here you can download the manual explaining how Modbus functions work, how they are configured in a S7 master to collect specific data from the slave, and how the S7 functions are imple,mented to run theModbus network.
SIMATIC S7-300/S7-400 Loadable Driver for Point-to-Point CPs: MODBUS protocol, RTU format, S7 is master

Modbus is not native to S7 PLCs, so the S7 functions FC7/FC8 used with the loadable driver are actually translating S7 addresses to Modbus addresses for communications over Modbus. So please study the Modbus descriptions in the manual closely, and then determine (with the Modbus mapping of the Pac3100) what data you want to collect, how many registers you will request, and what type of Modbus function is required,so you can prepare Modbus jobs in the S7 program.

The forum can also try to help you out when you have more specific questions.

Hope this helps,
Daniel Chartier

Hope this helps,
Daniel Chartier

Last edited by: dchartier at: 10/8/2010 8:29 PM

10/8/2010 8:32 PM	Rate (0)
Ben Rad Bronze Member Joined: 7/28/2010 Last visit: 8/31/2024 Posts: 184 Rating: (11)	Oscar, This link may help you. /tf/WW/en/Posts/47061 Regards, Behnam www.sigmaprocess.ca/blog

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Created by: Oscar_83PL at: 10/8/2010 8:09 PM (2 Replies)

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