Send two values at the same time with modbus rtu

Hello,

do you have any example about that?

So, I try to explain what I want to do:

I have aCPU 1212C with 1241 module. I want to read two analog input (0/10V) and i want to send the two values  at two diferent slave panel meter with modbus rtu communication.

I have created part of the program, but how i can send the values at the same time (automaticly)

Can you help me?

My "siemens level" is very very low ...

Thank you very much!!

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Split from Modbus RTU a few slaves.

I believe that you can use the Modbus master to send a broadcast message to all of the Modbus slaves at the same time.

The S7-1200 manual describes this under the Modbus_Master instruction. The address is 0, only certain Modbus functions will work (writing output bits or holding registers), and their is no reply from the slaves.

Hi pedroso,

basically modbus is an serial communication which communicates with one after the another it cannot happen simultaneously ...may be you can reduce 500ms to some 100ms call that block in ob35..

u can use help menu where u can find the sample program and procedure..

keep ur mouse point on your MB master block under communication modbus help menu link appears..