Mitsubishi Electric FX3U-232-BD User Manual page 441

FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
- The PLC waits for 15 ms after acquiring the communication port, and then starts communication using
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 frees the communication port, and then executes inverter communication instructions driven in
the next step and so on.
M0
M1
M0
IVWR
instruction
(Communicating)
M1
IVCK
instruction
(Communicating)
M8151
*1. The PLC does not execute the instruction even if M8151 is turned OFF because the drive contact is
OFF.
*2. When two or more instructions are driven at the same time during communication, the next inverter
communication instruction is executed after the current instruction is completed.
*3. M8151 remains OFF until the next inverter communication instruction is driven after execution of the
current inverter communication instruction is completed.
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
completed, set the drive contact to OFF using the instruction execution complete flag M8029.
X001
M0
M8029
Instruction execution
complete
3. Communication complete flag (M8029)
When communication with an inverter is completed, 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.
FNC273
 
IVWR
FNC270
 
IVCK
*1
15ms
15ms
IVWR
FNC274

IVCK
9 Creating Programs (FX3S, FX3G, FX3GC, FX3U, FX3UC)
9.3 Common Items in Inverter Communication Instructions
 
 
15ms
IVCK IVWR
SET M0
  
RST M0
*2
15ms
*2
15ms
IVCK IVWR
*3 *3
Command is
latched
Communication is
executed
Command is
reset
E-99
A
B
C
D
E
F
G
H
I
Apx.A