Seeking help: When using a MODBUS communication module to connect a Siemens S7-300 to a Hollyland DCS, which model of CP341 should be chosen for this communication module?
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Seeking help: When using a MODBUS communication module to connect a Siemens S7-300 to a Hollyland DCS, which model of CP341 should be chosen for this communication module? Asking on behalf of someone else; please offer your advice.
This post was last edited by budaoweng123 on 2016-9-29 at 16:46. Generally, the Allen-Bradley DCS acts as the Modbus master, while the Siemens PLC functions as the Modbus slave, using the Modbus RTU protocol. If the above information is confirmed, then place an order for CP 341-RS 422/485 with the part number: 6ES7 341-1CH02-0AE0 X27 (RS 422/485), featuring a 15-pin interface. Additionally, if you do not have the capability to develop communication programs, you can purchase a ready-made dongle; the part number for this is 6ES7 870-1AB01-0YA0, which includes driver software