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CP341 as slave

4/5/2010 11:23 AM	Rate (0)
Hike Posts: 138 Rating: (0)	Dear Guys i want to communicate CP341 with CPU315-2DP as slave over a DCS networkd(Non siemens). There are multiple CP341 slaves which will send data to DCS. Please guide me how should i connect them. Thanks in anticipation
Hike Posts: 138 Rating: (0)
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4/5/2010 12:26 PM	Rate (0)
Wüstenräuber Gold Member Joined: 10/3/2008 Last visit: 10/22/2025 Posts: 996 Rating: (129)	Hi, this is the conference for ModbusTCP, not for Modbus serial. @Moderators: Please move this question into the conference "Communication / Networks". Wüstenräuber

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4/6/2010 10:22 AM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Hike, you have to build up a RS485-network, each CP341 gets a distinct slave address. The master has to read the data from the Modbus slave devices. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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4/7/2010 9:17 AM	Rate (0)
Hike Posts: 138 Rating: (0)	Okz i will assign distinct addresses to each CP and will build 2 wire RS485 Network. But i have some doubt in mind. Shall i have to call 'X' times the routine FB80 (MODB_341).. say i m using two CP341 slaves so i will have to call same routine twice with different LADDR Thanks in anticipation
Hike Posts: 138 Rating: (0)
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4/7/2010 5:36 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Hike, I wonder what your configuration is about. The normal master-slave-configuration consists of one master and several slaves. If you have got two CP341, I expect they are located in two Simatic stations. So you have to call FB80 in each Simatic station once. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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4/10/2010 7:46 AM	Rate (0)
Hike Posts: 138 Rating: (0)	Basically i have two slaves working as redundant one CPU working at once. But each CPU is connected to two remote I/O's IM153-2 and each IM has one CP341. The redundancy is software redundancy with CPU315-2DP. Suppose with master working it will have two CP341 to serve. Now in that case what should in software. Shall i have to call MODBUS routine twice with different addresses in OB1. Shall this scheme work Thanks in anticipation
Hike Posts: 138 Rating: (0)
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4/10/2010 5:13 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Hike, please have a look at the attached sketch. Regards, Kaulquappe Attachment Dokument1.pdf (258 Downloads)
Kaulquappe Posts: 3093 Rating: (324)
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4/10/2010 11:12 PM	Rate (0)
Hike Posts: 138 Rating: (0)	Thanks Kaulquappe That's exactly i was asking for. Thanks again
Hike Posts: 138 Rating: (0)
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