Serial event on ml1400 series-a

scadagetco

Member
S
Join Date
Mar 2013
Location
gujarat
Posts
6
hello friends

i am communicating my ML-1400 PLC(SERIES A) with some device (currently I am using a microcontroller based on ATmega 328 popularly known a ARDUINO) that is capable to send ASCII characters and integers as if its connected to HYPERTERMINAL on a PC.

so now I am able to
1> Send ASCII characters to my PLC.

Now I want my PLC to do the following.
1> Decode those ASCII values and take proper action like energize one of the PLC's digital outputs.

2> Aslo want my PLC to decode those ASCII values and return the STATUS OF INPUT/OUPUT coils on the same serial port.

CAN ANYONE PROVIDE SAMPLE PROGRAME FOR THIS
i am a newbie

Thank you very much.
And waiting for your reply!!
 
I strongly recommend that you use a Modbus RTU protocol library for Arduino, instead of attempting to write your own protocol in ASCII.

Connections like yours are the entire reason Modbus RTU protocol exists.

The Arduino will be a Modbus RTU master, and the MicroLogix serial port will be a Modbus RTU Slave.

If you are in the SCADA business, Modbus RTU is a core technology that you need to master. This is a great opportunity to do so.
 
I thought the question looked familiar.

Thanks for that link to the configuration example; it might be easier to follow than the User Manual.
 
Ken Roach said:
I thought the question looked familiar.

Thanks for that link to the configuration example; it might be easier to follow than the User Manual.
Click to expand...

You're welcome. :)

It should get him started in any case. My take on his question is that he's all set on the Arduino side of things and just needs help with the AB side.
 
thank you so much to all for all your interest in my topic

as per ken roach sir told
i will try with modbus porotocol
thanks for your suggestion sir
 
Serial event on ml1400 series-A

HELLO FRIENDS


one more thing i want to know that while serially connecting PLC AND ARDUINO do i need RS-232 TTL convertor or directly connecting PLC-TX to ARDUINO-RX and PLC-RX to ARDUINO-TX will work???
 
Serial event on ml1400 series-A

Thanks sir for replying

i am using ARDUINO MEGA which is having more than one serial port

it means that i have to buy a shield which you have shown in the link to communicate between PLC and ARDUINO MEGA

am i correct sir ???

waiting for your reply
 
scadagetco said:
it means that i have to buy a shield which you have shown in the link to communicate between PLC and ARDUINO MEGA
Click to expand...

I certainly would. The shield should take care of the dirty work of translating voltage levels and give you a bit of isolation anyway.

But finding a RS232 shield for the Mega might be tough. I would go with one of these and just hook it directly to the Mega's header.

http://www.elechouse.com/elechouse/...ducts_id=585&zenid=q4ivfcrge0ob3s4l8b0e9831e7
 

Similar Topics

O
about serial event
hello friends this is my first post so hope i will get my doubt solved is it possible to program PLC to take an action when an event occurs on...
Replies
11
Views
4,141
only11
O
K
MICROLOGIX-1400 serial event
Hello, I got a MICROLOGIX-1400 Series A PLC and for some purpose I want to control it remotely through some means over internet. So my setup is...
Replies
0
Views
1,687
kevalvakani
K
tlf30
AOI for Modbus rs-485 on L62 serial port?
Does anyone know of an AOI using the user ASCII protocol select on the L6x controllers that will talk Modbus RTU using RS-485? Thanks, Trevor...
Replies
1
Views
125
tlf30
tlf30
E
Modbus serial data from multiple devices to M340 controller
I have 9 field devices, three METSEPM5110 power meters and six ACE949-2 rs285 interface modules. I want to read this Modbus rtu data through rs485...
Replies
8
Views
304
Enggshab
E
W
9030 serial port
I have lm9030 program on my toughbook CF-29 cannot get my program to hook up with the serial port.
Replies
2
Views
64
Steve Bailey
Steve Bailey
Back
Top Bottom