Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Write Modbus Data

3. Instruction Set

API

101

Mnemonic	Operands	Function	Controllers
MODWR		Write Modbus Data	ES2/EX2	SS2	SA2 SX2
					SE

Type

Bit Devices

Word devices

Program Steps

OP

X

Y

M

S

K

H

KnX

KnY

KnM

KnS

T

C

D

E

F

MODWR: 7 steps

S1

*

*

*

S2

*

*

*

n

*

*

*

16-bit

PULSE

32-bit

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

SE

SE

SE

Operands:

S1: Device address (K0~K254)

S2: Data address

n: Data to be written

Explanations:

1.MODWR instruction supports COM2 (RS-485).

2.MODWR is an instruction exclusively for peripheral communication equipment in MODBUS ASCII/RTU mode. The built-in RS-485 communication ports in Delta VFD drives (except for VFD-A series) are all compatible with MODBUS communication format. MODRD can be used for communication (write data) of Delta drives.

3.If the address of S2 is illegal for the designed communication device, the device will respond with an error, PLC will record the error code in D1130 and M1141 will be ON. For example, if 8000H is invalid to VFD-B, M1141 will be ON and D1130 = 2. For error code explanations, please see the user manual of VFD-B.

4.The feedback (returned) data from the peripheral equipment will be stored in D1070 ~ D1085. After data receiving is completed, PLC will check the validity of the data automatically. If there is an error, M1140 will be ON

5.If peripheral device receives a correct record (data) from PLC after M1140/M1141 = ON, the peripheral device will send out feedback data and PLC will reset M1140/M1141 after the validity of data is confirmed.

6.There is no limitation on the times of using this instruction, but only one instruction can be executed at a time on the same COM port.

7.If rising-edge contacts (LDP, ANDP, ORP) or falling-edge contacts (LDF, ANDF, ORF) is used before MODWR instruction, sending request flag M1122 has to be executed as a requirement.

8.For associated flags and special registers, please refer to Points to note of API 80 RS instruction

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