DVP-ES2-EX2-SS2-SA2-SX2-Operation Manual

3. Instruction Set
API Mnemonic Operands Function
105 RDST Read VFD Status
Controllers
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 * * *
Operands:
S: Device address n: Status content to be retrieved
PULSE 16-bit 32-bit
ES2/EX2 SS2 SA2
SA2
SA2
SX2 ES2/EX2 SS2 SX2 ES2/EX2 SS2
SE SE SE SX2
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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