3. Instruction Set
3-283
API Mnemonic Operands Function
105
RDST
Read VFD Status
Controllers
ES2/EX2 SS2 SA2
SE
SX2
Bit Devices Word devices Program Steps Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S
* * *
n * * *
RDST: 5 steps
PULSE 16-bit 32-bit
ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2
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 D1073 low
U
Communication address (range: 00~31). Displayed in
ASCII format.
D1074 low
N Status content to be retrieved (00 ~ 03). Displayed in ASCII D1075 low
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