Dear Members ,
I am using a S7-1200 with a communication module CM-1241 , I want to read / write data from few MODBUS devices like PH meter , Density meter etc.
For every MODBUS devices , i have given a unique a node address , and same communication parameters like (baud , stop bit , parity).
I have did the connection as mentioned above in the photo , i have daisychained all modbus devices , I am getting + and -ve cable on my panel.
I have connected +ve to PIN 3 and -ve to PIN 8 and GND to PIN 5 (optional).
Apart from this connection , is there anything more which i need to connect , i heard we have to use terminal resistors in some cases , is using terminal resistors necessary ? also please can u please give me details of communication configuration which i have to do in s7-1200 PLC ?
Thanks and Regards,
Rahul P
I am using a S7-1200 with a communication module CM-1241 , I want to read / write data from few MODBUS devices like PH meter , Density meter etc.
For every MODBUS devices , i have given a unique a node address , and same communication parameters like (baud , stop bit , parity).
I have did the connection as mentioned above in the photo , i have daisychained all modbus devices , I am getting + and -ve cable on my panel.
I have connected +ve to PIN 3 and -ve to PIN 8 and GND to PIN 5 (optional).
Apart from this connection , is there anything more which i need to connect , i heard we have to use terminal resistors in some cases , is using terminal resistors necessary ? also please can u please give me details of communication configuration which i have to do in s7-1200 PLC ?
Thanks and Regards,
Rahul P