Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Program Example 11 COM2 RS-485, Function Code H10

3. Instruction Set

Program Example 11: COM2 (RS-485), Function Code H10

1.Function code K16 (H10): Write in multiple Word devices. Up to 16 Words can be written. For PLC COM2 ASCII mode, only 8 words can be written.

2.For ASCII or RTU mode, PLC COM2 stores the data to be sent in D1256~D1295, and the received data in D1070~D1085.

3.Take the connection between PLC COM2 and VFD-B AC motor drive for example, the tables below explain the status when PLC COM2 writes multiple word devices in VFD-B.

M1002					D1120 Set communication protocol as 9600, 8, E, 1
			MOV	H87
			SET	M1120	Retain communication protocol
			MOV	K100	D1129 Set communication timeout as 100ms					M1143 = ON
			RST	M1143	M1143 = OFF			SET	M1143
					ASCII mode					RTU mode
	X0
				M1122	Sending request
			SET
X0						H2000	D50	K2
			MODRW	K1	K16				Data length(word)
									Data storing register
									Data address: H2000
									Function code: K16
									write in multiple Words
Receiving completed									Connection device
M1127									address: K1
			Processing received data
		ASCII mode: The received data is stored in D1070~D1085 in ASCII format
		RTU mode: The received data is stored in D1070~D1085 in Hex
			RST	M1127	Reset M1127

ASCII mode (M1143 = OFF)

When X0 = ON, MODRW instruction executes the function specified by Function Code H10 PLC ÖVFD-B, PLC transmits: “01 10 2000 0002 04 1770 0012 30”

VFDÖPLC, PLC receives: “01 10 2000 0002 CD”

Registers for data to be sent (sending messages)

Register			Data			Descriptions
D1256	Low byte	‘0’		30 H	ADR 1	Address of VFD: ADR (1,0)
D1256	High byte	‘1’		31 H	ADR 0
D1257 Low byte		‘1’		31 H	CMD 1	Control parameter: CMD (1,0)
D1257	High byte	‘0’		30 H	CMD 0
D1258	Low byte	‘2’		32 H	Data Address

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