Mitsubishi FX3U-232-BD - 12.2 Details of Related Devices for FX2 N and FX2 NC PLCs; 12.2.1 Instruction execution complete [M8029]; 12.2.2 Extension ROM cassette check [M8104]; 12.2.3 Communication port busy [M8155]

E-103
FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
12 Related Data
12.2 Details of Related Devices for FX2N and FX2NC PLCs
A
Common Items
B
N:N Network
C
Parallel Link
D
Computer Link
E
Inverter Communication
F
Non-Protocol Communication (RS/RS2 Instruction)
G
Non-Protocol Communication (FX
2N
-232IF)
H
Programming Communication
I
Remote Maintenance
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Discontinued models
12.2 Details of Related Devices for FX2N and FX2NC PLCs
The following devices are special devices used in inverter communication.
12.2.1 Instruction execution complete [M8029]
When execution of an inverter communication instruction is completed, this device turns ON.
1. Detailed contents
When execution of an inverter communication instruction is completed, M8029 turns ON, and remains ON for
1 scan.
When an error occurs in an inverter communication instruction, M8029 turns ON.
2. Cautions on use
M8029 is used as the execution complete flag for other instructions (such as positioning instructions).
When using M8029, provide the contact just under the instruction whose execution completion is to be
checked.
12.2.2 Extension ROM cassette check [M8104]
This device remains ON while an extension ROM cassette is attached.
1. Detailed contents
M8104 remains ON while an extension ROM cassette is attached.
-FX
2N . . . . . . FX2N-ROM-E1
-FX
2NC . . . . . FX2NC-ROM-CE1
2. Cautions on use
While M8104 is OFF, EXTR instructions cannot be used.
12.2.3 Communication port busy [M8155]
This device remains ON while the communication port is being used by an EXTR instruction.
1. Detailed contents
M8155 remains ON while communication with an inverter is executed by an EXTR instruction.
When M8155 turns ON, D8155 stores the step number of an instruction using the communication port.
While M8155 is ON, another EXTR instruction cannot be executed.
12.2.4 Communication error or parameter error [M8156]
This device turns ON when an error is caused in communication with an inverter by an EXTR instruction.
1. Detailed contents
M8156 turns ON when an error is caused in communication with an inverter by an EXTR instruction.
When M8156 turns ON, D8156 stores the error code.
2. Cautions on use
M8156 is set to OFF by an EXTR instruction located in the next step in the program.
When using M8156, provide it just under the EXTR instruction whose error is to be checked.