9/29/2022 4:03 PM | |
Joined: 3/30/2020 Last visit: 9/25/2024 Posts: 4789 Rating: (982) |
Hello. Modbus RTU is a software driven protocol; for that reason you are not seeing the option in the hardware configuration. There are two generations (versions) of Modbus RTU. Each of them has its strength and weakness. The newer version is recommended. It is possibly best if you have a look at this sample: ~ |
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9/30/2022 9:38 AM | |
Joined: 7/1/2020 Last visit: 8/1/2024 Posts: 46 Rating: (2) |
Hello qwazee, Thank you for the reply. I already tested and modbus is working with no 2 and no 3 instruction even there is no option for Modbus at the hardware configuration for this s7-1200 module What I found is that for number 2, I need another step which to assign static parameter MODE at the data block instance of "Modbus_Comm_Load" to 4 for RS485-mode before triggering Req for the "Modbus_Comm_Load" function. Question : if Modbus if only the software driven protocol, for S7-1500 can Modbus be done only with 6ES7540-1AB00-0AA0 SIMATIC S7-1500 CM PTP RS422/485 BA Communication module OR I still need 6ES7541-1AB00-0AB0 CM PTP RS422/485 HF Communication module ? Because at product webpage only show that 6ES7541-1AB00-0AB0 have modbus while 6ES7541-1AB00-0AB0 dont have modbus, only freeport/3964(R) Same also if see at hardware configuration in TIA Portal for the module. If yes,than it too bad because I previously bought 6ES7540-1AB00-0AA0 then I thought it cannot support modbus, so I bought another module 6ES7541-1AB00-0AB0 Regards, Faizal
AttachmentS7-1500CMPTP.pdf (358 Downloads) |
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