Communicating Allen Bradley Micrologix 1500 LRP with LAPTOP through Modbus RTU

engr83

Member
Join Date
Jun 2013
Location
Karachi
Posts
5
Hi,

Need to communicate Allen Bradley Micrologix 1764 LRP with my Laptop to read data (coil & holding registers) via modbus rtu protocol using MODSCAN32 software.

Thanks & Regards.
 
Last edited:
Thanx for Reply Mickey,

i m communicating with the laptop using 1761-cbl-pm02 through COMM port 0, i need to know which modbus protocol should be used, is it slave or master ?

Is there any requirement of function to be written on Ladder program?

Thanx
 
MODSCAN32 is a Modbus Master so configure your ML1500 as a Modbus RTU Slave.


Is there any requirement of function to be written on Ladder program?

Just configure the port and map the addresses you want to read under Channel configuration.
 
Last edited:
First of all Thanx, it workss...wana share my experience

After mapping the data table & successfully check in modscan32, need to communicate the micrologix with DCS. But the distance between RTU & MTU is around 150 m, so i tried RS232-RS485 converter without external power supply which did not work. i found in some article that if set the baud rate up to 9600 the cable distance on RS232 will increase. See the reference below

http://www.lammertbies.nl/comm/info/RS-232_specs.html

So implement the above method & it works :)

Also found some useful document related to this matter, see the attached file.


Thanx & regards

1761-cbl-pm02.gif
 

Attachments

  • QuickStart_uLogix_ModBus.doc
    163 KB · Views: 53
Last edited:
Thanks for the feedback.

I have never seen a cable length chart like that before. I have done 150' at 9600 baud before without issues.
 

Similar Topics

Hi All I am having troubles with communication between plc(micro850) and hmi(Delta Dop-b) Have any one successfully did a connection between...
Replies
1
Views
2,888
i am trying to network a 6182 with a controllogix5555 plc together. they communicated fine before, and i can still see the plc on my rslink on my...
Replies
3
Views
3,262
Dear All Please help me about Below picture problem.PLC not communicating proper.
Replies
4
Views
161
I need to recommend a PC to replace a customer's old Windows 7 computer. The only thing I need to think through is the serial com port to...
Replies
21
Views
640
Hello Friends, We have a powerflex that stopped working sometime last week. It doesn't communicate over the network, or use CCW directly from my...
Replies
1
Views
403
Back
Top Bottom