ChristophD

you can use i-slave communication, here one PLC is PROFIBUS Master and the Other PROFIBUS Slave.

The communication use a GSD File for dataeschange.

or you use the _xSend/_xreceive functions

 I have used I-slave communication, but it's not work. Is there a problem with the configuration in the picture?

o0yuming0o

 

ChristophD

you can use i-slave communication, here one PLC is PROFIBUS Master and the Other PROFIBUS Slave.

The communication use a GSD File for dataeschange.

or you use the _xSend/_xreceive functions

 I have used I-slave communication, but it's not work. Is there a problem with the configuration in the picture?

ChristophD

depends on the other project, here you must configured the slots mirrored 

and you see in your second picture that you have a complete other configuration for the slots.

 I chose length, not Unit, and the total length of the data configured in the 2 projects is the same.

ChristophD

but not the configured slots.

on Master you have configured 6 slots which not match the 2 slots on slave side

the total length of the data is not relevant, only the length of the configured single slots

 You are right, Can you tell me the difference between Unit and Length?

ChristophD

length -> the complete slot will be consistent accessed

unit -> only the single bytes wil be consistent accessed

 Thank you very much.