Delta DVP plc Modbus Communication with SCADA

amit22

Member
Join Date
Jun 2008
Location
gujarat
Posts
64
Hello All,

can anybody help with the Sample program of the Delta PLC and SCADA with modbus communication through RS485 port.





Regards
Amit
 
Hi,
Almost every SCADA has Modbus driver. Delta PLC supports RTU as well as ASCII Modbus. Read DVP protocol manual given on Delta site. Modbus addressing for DI , DO , registers etc is explained there.
 
hello Shrirampendse

yes you are write but can you post ladder sample prgram which helps us to understand how to use Modbus function to read and write data.

Regards
amit
 
Hi,
In your DVP software open comm programm menu , configure RS485 port and set para as per your requirement.
send me your mail ID , I will send sample programme.
 
I also try to make communication between CITECT V7.2 and DELTA PLC ES2
PROTOCOL modbusA /9600/even/7/1
and whem i compile every think is ok but when i try to run runtime its rell me modbusA not initialize what is the problem

The second quistion what the diferent between modbusA,modbusA2,modbusA3.....
 
Check all comm settings like port , device , baud rate , parity etc.
In computer setup editor
you need to add parameters in modbusa2 section , maxbits = 128 , inittype =3

modbus a1 , 2 ,3 differ in register start address etc.
 
Dear shrirampendse can you see my configuration in captures and tell me whats wrong and what the next step must i do

 
Last edited:
Dear Abbas,
Today I am busy. I will send you checked OK prj backup in two days. Meanwhile Use Modbusa2 instead of Modbusa . Do Computer setup parameters as I posted earlier.
 
(1) While installing Citect did you install Modbus drivers ?
May be NOT, that is why "No serial Drivers error" , reinstall modbus drivers from Citect DVD.
(2) There are too many devices , ports , etc .
(3) Network address not specified . Give local IP or 127.0.0.1
(4) Enter computer setup editor parameters as shown in screen shot.
(5) Before connecting to SCADA ensure your USBserial cable & PLC comm is OK. PLC node address & parameters are OK.
(6) Dont keep PLC in wrapped condition (overheating).
Best of Luck.
I use VijeoCitect or else I would have sent backup.
 
(1) While installing Citect did you install Modbus drivers ?
May be NOT, that is why "No serial Drivers error" , reinstall modbus drivers from Citect DVD.

In my folder i dont find modbus driver how can i find it
how can i know if modbus driver installed or not


(2) There are too many devices , ports , etc .

I don't know why that is happened because when i delete device or port is deleted but record number don't decrease.

(3) Network address not specified . Give local IP or 127.0.0.1

Is this important in serial RS232
(4) Enter computer setup editor parameters as shown in screen shot.

Which parameter you mean


(5) Before connecting to SCADA ensure your USBserial cable & PLC comm is OK. PLC node address & parameters are OK.

I checked its ok because i can dawnload programe by ISPSOFT

(6) Dont keep PLC in wrapped condition (overheating).

Than you i run PLC to test communication only .
Best of Luck.

Than you


I use VijeoCitect or else I would have sent backup.

Many thak you for your assistance me

I am new in CITECT and i can change to vejio citect.
 
Is this ok or not
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