Mitsubishi FX3U-232-BD User Manual page 398

FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
12.4 Details of Related Devices for FX
The following devices are special devices used in inverter communications.
12.4.1 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, and remains ON for 1 scan
in the same way.
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.
12.4.2 Serial communication error [M8063 and M8438]
These devices turn ON when an error occurs during communication with an inverter.
1. Detailed contents
M8063 or M8438 turns ON when a parity error, overrun error or framing error occurs during communication
with inverters or when on inverter communication error occurs.
M8063 turns ON when an error occurs during communication using ch1. When M8063 turns ON, D8063
stores the error code.
M8438 turns ON when an error occurs during communication using ch2. When M8438 turns ON, D8438
stores the error code.
2. Cautions on use
M8063 and M8438 do not turn OFF even if the communication recovers its normal status. Clear them by
switching the PLC mode from STOP to RUN.
12.4.3 Inverter communication ON [M8151 and M8156]
These devices remain ON while the communication port is used by an inverter communication instruction.
1. Detailed contents
M8151 or M8156 remains ON while communication with an inverter is executed by an inverter communication
instruction.
M8151 remains ON while communication port ch1 is used. While M8151 remains ON, D8151 stores the step
number of an instruction using the communication port.
M8156 remains ON while communication port ch2 is used. While M8156 remains ON, D8156 stores the step
number of an instruction using the communication port.
2. Cautions on use
While M8151 or M8156 remains ON, another inverter communication instruction cannot be executed.
E-108
12.4 Details of Related Devices for FX3U and FX3UC PLCs
and FX PLCs
3U 3UC
12 Related Data