Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Program Example COM2 RS-485, Fwd

3. Instruction Set

5.If rising-edge (LDP, ANDP, ORP) or falling-edge (LDF, ANDF, ORF) contacts are used before FWD, REV, STOP instructions, sending request flags M1122 (COM2) / M1316 (COM3) has to be enabled in advance for obtaining correct operation.

6.For detailed information of associated flags and special registers, please refer to RS instruction.

7.M1177 = OFF, only Delta VFD-A is supported and the definition of each operand is:

a)S1 = Address of VFD-A. Range of S1: K0 ~ K31

b)S2 = Operation frequency of VFD. Set value for VFD A-type inverter: K0 ~ K4,000 (0.0Hz ~ 400.0Hz).

c)n = Communication mode. Range: K1 ~ K2. n = 1: communicate with VFD at designated

address. n = 2: communicate with all connected VFDs. .

d)The feedback data from the peripheral equipment will be stored in D1070 ~ D1080 After data receiving is completed, PLC will check if all data are correct automatically. If there is an error, M1142 will be ON. When n = 2, PLC will not receive any data.

Program Example: COM2 (RS-485)

1.Communication between PLC and VFD-A series inverter. Retry for communication time-out and data receiving error.

M1002					Set up communication protocol as
		MOV	H0073	D1120
					4800, 8, O, 1
		SET	M1120	Retain communication protocol
		MOV	K100	D1129	Set up communication time-out: 100ms
	X0

M1129

M1142

SET M1122 Sending request

Retry when receiving time-out occurs

Retry when data receiving error

X0					Communication instruction setting:
					Device address: 0
	FWD	K0	K500	K1	Frequency: 500Hz
Receiving completed					K1: communicate with the designated VFD
M1127				The received data is stored in low byte
	Processing received data			of D1070 ~ D1080 in ASCII format.
	RST	M1127	Reset M1127

PLC VFD-A, PLC sends: “C ♥ ☺ 0001 0500 ”

VFD-A PLC, PLC receives: “C ♥ ♠ 0001 0500 ”

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