E-86
FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
9 Creating Programs (for FX3G, FX3U and FX3UC PLCs)
9.3 Common Items in Inverter Communication Instructions
- 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.
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.
M0
M1
FNC273
IVWR
FNC270
IVCK
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.
M0
M1
M8151
IVWR
instruction
IVCK
instruction
Note 2
Note 1
15ms 15ms 15ms
X001
SET M0
Command is
latched
RST M0
M8029
Instruction execution
complete
FNC274
IVCK
M0
Communication is
executed
Command is
reset
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