12/26/2019 6:42 AM | |
Posts: 1 Rating: (0) |
Hi, We have currently installed simatic PLC CPU 315F-2PN/DP which is connected to plant DCS via Modbus RTU RS 485 CP341 RS485 (6ES7 341-1CH02-0AE0) We are going to have one more PLC which we want to multidrop the RS 485 modbus RTU from the above PLC. Can you share the cable type and connector type for establishing the above multi drop configuration.
------------------------------------------------------------------------------------------ AttachmentRTO PLC INTERFACE-1.pdf (42 Downloads) |
Last edited by: Jen_Moderator at: 12/27/2019 09:10:59New subject after splitting |
|
12/27/2019 1:28 PM | |
Joined: 9/27/2006 Last visit: 9/24/2024 Posts: 12282 Rating: (2685) |
Hello nasikethanp; The CP 341 installation manual has a chapter on Connecting cables that you should look at for the information you need.. https://support.industry.siemens.com/cs/gb/en/view/1117397 As you can see in the screenshot below you need Sub-D 15-pin connectors on the CP 341 (RS-485) with a 2-pair cable using pins 2, 8 and 9.(Ta-, Gnd, Tb+, for RS-485 2-wire connections). For connection your your DCS, you will need to match the RS-485 pins of your CP 341 with the signals required by your DCS master on that cable. Note also that a Modbus RTU network can onl;y have one master in its design, so: can your DCS act as a Modbus RTU slave? If not, your CP 341s must be setup as slaves to the DCS. Hope this helps. |
Last edited by: dchartier at: 12/27/2019 13:30:39Last edited by: dchartier at: 12/27/2019 15:08:46 |
|
Follow us on