Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Program Example 3 COM2 RS-485, Stx, Adr, Cmd, Lrc Chk

DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming

Program Example 3: COM2 RS-485

1.Connect PLC to VFD-B series AC motor drives (AC motor drive in ASCII Mode; PLC in 16-bit mode and M1161 = OFF).

2.Write the data to be sent into registers starting from D100 in advance in order to read 6 data starting from address H2101 on VFD-B

M1002		H86	D1120	Set up communication protocol as
	MOV
				9600,7,E,1
	SET	M1120	Retain communication protocol
	MOV	K100	D1129	Set up communication time-out as 100ms
Pulse for
sending request
	Write transmitting data in advance
	SET	M1122	Sending request
X0		D100		D120	K35
	RS		K17
Receiving
completed

M1123

Processing received data

RST M1123 Reset M1123

PLC Ö VFD-B, PLC sends “: 01 03 2101 0006 D4 CR LF “

VFD-B Ö PLC, PLC receives “: 01 03 0C 0100 1766 0000 0000 0136 0000 3B CR LF “

Registers for sent data (PLC sends out messages)

Register		Data			Explanation
D100 low	‘: ’		3A H	STX
D100 high	‘0’		30 H	ADR 1	Address of AC motor drive: ADR (1,0)
D101 low	‘1’		31 H	ADR 0
D101 high	‘0’		30 H	CMD 1	Instruction code: CMD (1,0)
D102 low	‘3’		33 H	CMD 0
D102 high	‘2’		32 H
D103 low	‘1’		31 H	Start data address
D103 high	‘0’		30 H
D104 low	‘1’		31 H
D104 high	‘0’		30 H
D105 low	‘0’		30 H	Number of data (counted by words)
D105 high	‘0’		30 H
D106 low	‘6’		36 H
D106 high	‘D’		44 H	LRC CHK 1	Error checksum: LRC CHK (0,1)
D107 low	‘4’		34 H	LRC CHK 0
D107 high	CR		D H	END
D108 low	LF		A H

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