PLC CP1E, HMI, Arduino UNO, PID Communication

Projects Interfacing w/ Software on the Computer
1

Hi i'm making project about implementing PID on 3 phase motor. It's to hard to use PID on plc and i choose to make the PID in the Arduino to do a 2-way communication with PLC. If i want to connect Arduino Uno with PLC CP1E. What kind of Communication i shall use?

Note: I already use RS232 in plc to connect with HMI. That means i only have arduino and USB Type B in PLC to connect. I also bought MAX 232 because i thought plc has 2 port RS232.

I know this is arduino forum, but i wish someone understand the connection between plc and arduino.
Thanks.

2

Your topic has been moved. Please do not post in "Uncategorized"; see the sticky topics in https://forum.arduino.cc/c/using-arduino/uncategorized/184.

3

Hi i'm making project about implementing PID on 3 phase motor. It's to hard to use PID on plc and i choose to make the PID in the Arduino to do a 2-way communication with PLC. If i want to connect Arduino Uno with PLC CP1E. What kind of Communication i shall use?

Note: I already use RS232 in plc to connect with HMI. That means i only have arduino and USB Type B in PLC to connect. I also bought MAX 232 because i thought plc has 2 port RS232.

I know this is arduino forum, but i wish someone understand the connection between plc and arduino.
Thanks.

4

Please do not cross-post as it wastes peoples time. Your two topics on the same subject have been merged.

5

Understood. Now this is the only post about this topic right?

6

Yes.

7

One option would be to implement an I2C interface using two I/O points on your PLC. But before I did that I would look into the possibility of installing a second RS232 port or using a RS485 port.

8

Good to hear the solution but when look it up, that means i need to wire up the plc to make another way to communicate?

9

Yes, the I2C protocol uses a clock line and a data line. You would have to create a routine in the PLC to transmit/receive data from the Arduino. Probably not an easy task. That is why I suggest investigating the possibility of adding a second serial port.

There are several models that show a RS-232 port and a RS-485 port. The link I found suggests the possibility of two RS-232 ports. Try contacting Omron support to investigate the possibilities.

10

Yes, it's possible to ad another port and i just found out that my friend has the extension. Such a fun way to hear about making a route.. but yeah it's too hard for me as a student :')