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AJITnayak

Delta plc Communication Issue

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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

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Modbus RTU protocol ---->modbus module and plc setting must match baud rate,parity,Stop bit & data length

The attached program is for Dvp-Es2. PLC Com1  is for download/upload and MODBUS address id is "1".PLC Com3 MODBUS address id is "2". MY MODBUS MODULE HAVE TO START FROM 3 ONWARDS.
DOWNLOAD "MODBUS  POLL" SLAVE AND INSTALL ON COMPUTER.WITH A RS485 ATTACH TO COMPUTER COM PORT AND TEST WITH THE PLC.

 

 

ModBUS_REV2_ES2.isp

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