Modbus Query

S

Thread Starter

SPR

Is modbus protocol safe for carrying out peer-to-peer sharing of data between 2 controllers?

I have a requirement where a PLC and another controller are involved. The controller will control the process through hard-wired I/Os; PLC is required for monitoring and providing sequencing to the controller.

Is it safe to implement this using modbus?

I have come across recommendations saying modbus should not be used for such applications where control data is shared. Is it true?
 
I don't know what you mean by "safe", but there's no reason why Modbus wouldn't work just as well as any other protocol. You have to look at what protocols your PLC supports however to see what is even available to you.
 
F

Flavio Souza

I would only use for monitoring and non critical controls.

For safety, critical controls must be hard wired.

Modbus problems generally are:

- *Timeout* when one of the nodes are not connected or have failure. This will delay communication and therefore that exchanged between controllers will be late.

- *Lost of communication* If wiring is cut accidentally.
 
Thread starter Similar threads Forum Replies Date
A Modbus 4
P Modbus 3
N Modbus 3
K Modbus 2
D Modbus 6
Top