Mitsubishi FX3U-232-BD User Manual page 344

FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
7.2.3 Instruction completion and error flag operation
When two or more EXTR instructions are programmed, the following flags turn ON or OFF according to the
execution result of each EXTR instruction.
For acquiring the result of each EXTR instruction, make sure to provide these flags just below each EXTR
instruction.
Device number
1. Operation of M8029 (instruction execution complete flag)
M8029 (instruction execution complete flag) operates as shown below.
In the program below, M0 and M2 turn OFF and M1 turn ON when communication is completed.
(OFF)
M0
(ON)
M1
M2
(OFF)
2. Operations of M8156 (error flag) and D8156 (error code)
M8156 (error flag) and D8156 (error code) operate as shown below.
In the program below, a communication error occurs in [1] and [3], and communication is completed normally
in [2].
M8000
RUN
monitor
E-54
M8029 Instruction execution complete
M8156 Communication error or parameter error
D8156 Error code
[1] EXTR instruction is not driven.
FNC180
EXTR
[2] EXTR instruction is driven.
FNC180
EXTR
[3] EXTR instruction is not driven.
FNC180
EXTR
[1] Communication error (no response from inverter)
FNC180
EXTR
[2] Normal communication
FNC180
EXTR
[3] Communication error (data range error)
FNC180
EXTR
7 Creating Programs (for FX2N and FX2NC PLCs)
7.2 Common Items in Inverter Communication Instructions
Description
Operation of
instruction execution
complete flag
M8029 : OFF
M8029 : ON
M8029 : OFF
Operation of Error code
communication status
error flag
D8156: K1
M8156 : ON
Error code is
stored
D8156: K1
M8156 : OFF
Error code is not
changed
D8156: K268
M8156 : ON
Error code is
stored