Mitsubishi FX3U-232-BD User Manual page 365

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FX Series PLC User's Manual - Data Communication Edition

Inverter Communication

- Even if the drive condition turns ON, the PLC does not start execution of an inverter communication

instruction until the communication port busy flag M8151 turns OFF from ON, if M8151 is already set to

ON by another inverter communication instruction.

The PLC waits for 15 ms after freeing the communication port, and then executes the inverter

communication instructions driven in the next step and so on.

Note 1: If the drive contact is OFF in 15 ms after M8151 is turned OFF from ON, the instruction

cannot be executed.

Note 2: When two or more instructions are driven at the same time during communication, the latter

inverter communication instruction in the program is executed after the current

communication with the inverter is finished.

2) Cautions on programming

When communicating with inverters for two or more items, let the drive contact for inverter

communication instruction remain ON until sending is completed. After communication with all inverters is

finished, set the drive contact to OFF using the instruction execution complete flag M8029.

3. Communication complete flag (M8029)

When communication with an inverter is finished, the instruction execution complete flag M8029 turns ON,

and remains ON for 1 scan.

For the M8029 use method, refer to program examples shown below.

Instruction execution

9 Creating Programs (for FX3U and FX3UC PLCs)

9.3 Common Items in Inverter Communication Instructions

Communication is

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