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Created by: AnUyen at: 1/5/2009 11:04 AM (6 Replies)

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1/5/2009 11:04 AM	Rate (0)
AnUyen Posts: 8 Rating: (0)	Dear all Experts, I intend to use S7-300 to collect ASCII string from five Displays which can be address assigned(Displays return data on two wire Rs485 port), What Hardware/ Software should I need? Thanks so much for your help! BR, MHA
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1/5/2009 11:20 AM

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dchartier

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Joined: 9/27/2006

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Hello AnUyen;
The CP 340 could do the job (also the CP 341).
Look at the following description:

The CP 340 communications processor provides the following functionality:

Transmission rate up to 19.2 Kbaud, half duplex
Integration of the most important transmission protocols in the module firmware:

– 3964(R) procedure
– ASCII driver
– Printer driver

Table 1-1 Module variants of the communications processor
Module Order Number Integrated Interface

CP 340-RS 232C	6ES7 340-1AH02-0AE0	RS 232C interface
CP 340-20mA-TTY	6ES7 340-1BH02-0AE0	20mA-TTY interface
CP 340-RS 422/485	6ES7 340-1CH02-0AE0	X27 (RS 422/485) interface

For more information look at the CP 340 manual: PtP coupling and configuration of CP 340
http://support.automation.siemens.com/WW/view/en/1137332

Hope this helps,
Daniel Chartier

Last edited by: dchartier at: 1/5/2009 11:20 AM

1/5/2009 11:47 AM	Rate (0)
AnUyen Posts: 8 Rating: (0)	Dear dchartier, Firstly, thanks so much for your reply. I've read IM of CP340, however, as my understanding CP340 only support Point-to-Point communication. In my App, I have to collect data from five devices. I think about multi point network, but I have no experiments on this. Up to now I own one S7-300-2DP, five(05) PM4BC display from AIC(Australia) which return ASCII string with display address on its two wire RS485. Please give me some more sugestion? Thanks so much. Best Regard, AnUyen
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1/5/2009 1:25 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 11/7/2024 Posts: 12293 Rating: (2691)	Hello AnUyen; RS-485 is an electrrical standard which allows 32 participants on a single segment. As the CP 340 allows a RS-485 interfcae, it supports multipoint connections (by definition). Here is a FAQ that mentions the fact (although not as directly as you would like, probably...) http://support.automation.siemens.com/WW/view/en/416341 You will have to program a different P_Send function for each slave you wish to connect to, changing the LADDR (local address) parameter of each of the slaves to match the one provided in NETPRO, under "connections"where you will configure your PtP network. Hope this helps, Daniel Chartier

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1/5/2009 1:56 PM	Rate (0)
AnUyen Posts: 8 Rating: (0)	Dear Daniel Chartier, Thanks you so much! Your suggestion is very useful to me. I'll try with these CPs. Thanks! BR, AnUyen.
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1/5/2009 8:37 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 11/17/2023 Posts: 2705 Rating: (318)	Hi, I don't know those displays, but with a CP341 you could make a RS485 Multidropline where you could use it to communicate with the displays. The only thing you need to know is how to communicate with this displays... What did you have to send and what did you get back.... It is easier to use the small new displays, they could be programmed with WinCC Flexible 2008 and don't need any programming in the PLC.
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
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1/9/2009 10:14 AM	Rate (0)
AnUyen Posts: 8 Rating: (0)	Dear Daniel Chartier and Late, I have post my sketch system and data frame from those display at this thread, please view and clarify for me ( https://www.automation.siemens.com/tf/WW/en/Posts/26448#116837 ) ...Thank you very much for your attention! BR, AnUyen
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Created by: AnUyen at: 1/5/2009 11:04 AM (6 Replies)

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