Example of an Exchange from a Slave to a Slave Application

At a Glance

The Slave transmits a communication function to the slave application (Ad2).

Transmission

The PLC sender generates an unsolicited data request:

SEND_REQ(ADDR('0.0.1.7'), 16#00FC, %MW100:10, %MW130:4, %MW120:1)

Parameters of the request:

Parameters	Description
ADDR(‘0.0.1.7’)	0 : rack 0 : module 1 : channel 1 7 : transmitting address Ad1
16 #00FC	unsolicited data request
%MW100 = 16#FE 00	destination slave address (Ad2 = 11)
%MW101 = 16#FE 05
%MW102 = 16#00 0B
%MW103 to %MW109	application data to transmit

Reception

The PLC data receiver:

IF RE(%I0.3.4) AND NOT %MW100.0 THEN

(* initialization of the data to receive *)

%MW103:= 0;

(* communication function *)

DATA_EXCH(ADDR('0.0.1.11'), 3, %MW110:1, %MW100:4, %MW120:10)

END_IF;

Parameters of the request:

Parameters	Description
ADDR(’0.0.1.11’)	0 : rack 0 : module 1 : channel 1 11 : address Ad2
3	receive mode
%MW120 = 16#FE 00	xx: exchange number of the transmitter function
%MW121 = 16#FE xx	xx: exchange number of the transmitter function