Example¶

Example:¶
MODBUS interface of the client	COM1
Client writes to	Server 1
Data	abWriteBool[0] := TRUE abWriteBool[1] := FALSE abWriteBool[2] := TRUE
Source address at client	abWriteBool : ARRAY[0..2] OF BOOL
Target address at server	%MX0.1026.1 : 2011HEX = 8209DEC
The values of the BOOL variables abWriteBool[0]..abWriteBool[2] on the client are written to %MX0.1026.1..%MX0.1026.3 on the server.

MODBUS request of the client¶
Server address	Function code	Server operand address		Number of bits		Number of bytes	Data	CRC
Server address	Function code	High	Low	High	Low	Number of bytes	Data	High	Low
01HEX	0FHEX	20HEX	11HEX	00HEX	03HEX	01HEX	05HEX	B4HEX	37HEX

MODBUS response of the server¶
Server address	Function code	Server operand address		Number of bits		CRC
Server address	Function code	High	Low	High	Low	High	Low
01HEX	0FHEX	20HEX	11HEX	00HEX	03HEX	4EHEX	0FHEX

Parameterization \ of the COM_MOD_MAST Function Block inputs¶
EN	COM	SLAVE	FCT	TIMEOUT	ADDR	Number of bits	DATA
FALSE -> TRUE	1	1	15	Application- specific	8209	3	ADR (abWriteBool[0])