Example¶

Example:¶
MODBUS interface of the client	COM1
Client reads from	Server 1
Data	%MX0.1026.4 = FALSE %MX0.1026.5 = TRUE %MX0.1026.6 = FALSE
Source address at server	%MX0.1026.4 : 2014HEX = 8212DEC
Target address at client	abReadBool: ARRAY[0..2] OF BOOL
The values of the flags %MX0.1026.4..%MX0.1026.6 on the server are written to the ARRAY abReadBool on the client.

MODBUS request of the client¶
Server address	Function code	Server operand address		Number of bits		CRC
Server address	Function code	High	Low	High	Low	High	Low
01HEX	01HEX	20HEX	14HEX	00HEX	03HEX	37HEX	CFHEX

MODBUS response of the server¶
Server address	Function code	Number of bytes	Data	CRC
Server address	Function code	Number of bytes	Data	High	Low
01HEX	01HEX	01HEX	02HEX	D0HEX	49HEX

Parameterization of the COM_MOD_MAST Function Block \ inputs\ NB = Number of bits¶
EN	COM	SLAVE	FCT	TIMEOUT	ADDR	NB	DATA
FALSE -> TRUE	1	1	1	Application- specific	8212	3	ADR (abReadBool[0])