Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Api, B, Uu, Nn, Abcd

3. Instruction

Set

API

Mnemonic

Operands

Function

Controllers

105

RDST

Read VFD Status

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

RDST: 5 steps

S

*

*

*

n

*

*

*

PULSE

16-bit

32-bit

ES2/EX2	SS2	SA2	SX2	ES2/EX2	SS2	SA2	SX2	ES2/EX2	SS2	SA2	SX2
		SE				SE				SE

Operands:

S: Device address n: Status content to be retrieved

Explanations:

1.M1177 = OFF (Default), RDST instruction supports COM2(RS-485).

2.M1177= ON, RDST instruction supports COM2(RS-485), COM3(RS-485).

3.M1177 has to be set up in advance for selecting the target model of VFD. When M1177 = OFF (Default), RDST instruction supports Delta’s VFD-A inverter. When M1177 = ON, the instruction supports other models of VFD inverters, e.g. VFD-B, VFD.

4.There is no limitation on the times of using RDST instruction, however only one instruction can be executed on single COM port at a time

5.Rising-edge contacts (LDP, ANDP, ORP) and falling-edge contacts (LDF, ANDF, ORF) can not be used with RDST instructions. Otherwise, the data in receiving registers will be incorrect.

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

7.M1177 = OFF, only VFD-A is supported

a)Range of S: K0 ~ K31

b)Range of n: K0 ~ K3

c)n: Status content to be retrieved

n=0,	frequency
n=1,	output frequency
n=2,	output current
n=3,	Operation command

d)The feedback data consists of 11 bytes (refer to VFD-A user manual), and will be stored

in low bytes of D1070 ~ D1080.

”Q, S, B, Uu, Nn, ABCD”

Feedback	Explanation	Data storage
Q	Header of question string: ’Q’ (51H).	D1070 low
S	Checksum: 03H.	D0171 low
B	Acknowledge back. Correct: 06H, Error: 07H.	D1072 low
U	Communication address (range: 00~31). Displayed in	D1073 low
U	ASCII format.	D1074 low
N	Status content to be retrieved (00 ~ 03). Displayed in ASCII	D1075 low

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