AH500 Programming Manual
6-404
API
Instruction code
Operand Function
1804 RDST
S, D
Reading the statuses of the AC motor
drives
Device
X Y M S T C HC D L SM SR E PR K
16#
“$” DF
Pulse instruction
16-bit instruction (5 steps)
32-bit instruction
Symbol:
S
：
Unit address Word
D
：
Initial device in which the data is stored Word
Explanation:
1. The operand S should be within the range between 1 and 255. It can not be 0.
2. D: The data which the PLC receives from the AC motor drives is stored in the device specified
by users.
3. The instruction is used to read the states of the devices at the addresses 16#2100~16#2104 in
the AC motor drive. (Please refer to AC Motor Drive User Manual for more information about
the states of the devices.) The data which is received is stored in the device specified by D.
However, the data in D can not be altered if the communication timeout occurs or an error
occurs during the reception of the data. Therefore, make sure of the setting of SM100/SM101
before the PLC reads the states of the devices in the AC motor drive.
4. The operand D occupies five registers, i.e. D
n
, D
n
+1, D
n
+2, D
n
+3, and D
n
+4.
Example:
1. The PLC is connected to the VFD series AC motor drive (ASCII mode: SM210 and SM212 are
OFF). If the communication timeout occurs, the PLC retries the sending of the command.
2. The PLC reads the states of the devices at the addresses 16#2100~16#2104 in the AC motor
drive. The data which is received is stored in D100~D104.
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