Delta PLC Communication issue

[nayakajit87]

Dear all

I have DVP14SS211R series Delta PLC Which is having 24V DC supply voltage. I am using PLC as master and My end device as slave. My slave device set device_iD=1
I am using Modbus RTU protocol for Function code1
baud rate =9600
parity =none
Stop bit=1
data length=8

I would like to know how to send request with Function code 1(Read coil Register). i have attached code reference. Communication block it wont give error it shows 0 .means No error

 

[KlausST]

Hi,

I'm not familiar with these PLCs..

But I recognized one issue:
* in text and on first picture you say "8 N 1"
* but picture 4 shows "8 E 1"
--> parity mismatch: none vs even

Klaus

 

[nayakajit87]

I would like to know What is the Address to be set for MODRD/MODWR/MODRW function. If my salve id set is 1 FC1 start address 1 length is 32.

I have checked i made it correct . But i wanted to what should be register to get value.