HELLO ALL !!!
I want to control three VersaMAx IC200UAL006 PLC on Modbus communication. One is the master PLC and the other two is the Slave PLC. I want to read and write the Holding Register , Discrete Inputs,outputs of slave PLC.
Master PLC Port#2 Rs-485 , Station address#1 , Baud Rate 9600
Slave PLC Port#2 Rs-485 , Station address#1 , Baud Rate 9600
Slave PLC Port#2 Rs-485 , Station address#2 , Baud Rate 9600
I've Programmed Master PLC according to the manual attached with it.
For testing i've check master PLC communication By using MODBUS POLL Software and is working great.
Now what I want to know is ...
1) Whether I've also use the COMMREQ instruction in the Slave PLC's or Not ??
2) When I connected the Slave PLC along with master it doesn't show me any data change.
According the Program ... With reference to the manual attached
Page #33 , R0125 is the slave addresses and R0831 are the master addresses for slave#1.
Page #33 , R0002 is the slave addresses and R0731 are the master addresses for slave#2.
3) With Reference to page#4 , I'm using the cable connection given on Page#4. But still it is not working.
PLEASE let me know where i'm doing mistake.
Manual Name: gfk2220a.pdf
Regards,
Unus Iqbal
I want to control three VersaMAx IC200UAL006 PLC on Modbus communication. One is the master PLC and the other two is the Slave PLC. I want to read and write the Holding Register , Discrete Inputs,outputs of slave PLC.
Master PLC Port#2 Rs-485 , Station address#1 , Baud Rate 9600
Slave PLC Port#2 Rs-485 , Station address#1 , Baud Rate 9600
Slave PLC Port#2 Rs-485 , Station address#2 , Baud Rate 9600
I've Programmed Master PLC according to the manual attached with it.
For testing i've check master PLC communication By using MODBUS POLL Software and is working great.
Now what I want to know is ...
1) Whether I've also use the COMMREQ instruction in the Slave PLC's or Not ??
2) When I connected the Slave PLC along with master it doesn't show me any data change.
According the Program ... With reference to the manual attached
Page #33 , R0125 is the slave addresses and R0831 are the master addresses for slave#1.
Page #33 , R0002 is the slave addresses and R0731 are the master addresses for slave#2.
3) With Reference to page#4 , I'm using the cable connection given on Page#4. But still it is not working.
PLEASE let me know where i'm doing mistake.
Manual Name: gfk2220a.pdf
Regards,
Unus Iqbal