Programming; Common Items In Inverter Communication Instructions - Mitsubishi Electric FX5 User Manual

The following settings are unnecessary (fixed values).
Items
Start Bit
Header
Terminator
Control Mode
Sum Check Code
Control Procedure
FX3 Series-compatible SM/SD
When using the FX3 Series compatible SM/SD storage area, set to use special devices for either the FX3 Series CH1 or CH2.
FX3 Series compatible devices corresponding to the specified channel can be used.
For details, refer to the following.
Page 123 Related Devices
4.8

Programming

This section explains how to create programs which change parameters of inverters and give operation commands to
inverters.
A program example is shown for each inverter communication instruction.
For details on related devices, refer to Page 123 Related Devices.

Common items in inverter communication instructions

Inverter communication types
The PLC and inverter communicate using inverter communication instructions.
There are six types of inverter communication instructions that differ according to data communication direction and
parameter writing/reading direction as follows.
Instruction
IVCK
IVDR
IVRD
IVWR
IVBWR
IVMC
Function and operation
■Communication start timing
At the rising edge (OFFON) of the drive contact of the inverter communication instruction, the PLC starts communication
with an inverter.
Even if the drive contact turns OFF during communication with an inverter, the PLC executes communication until the last
instruction.
When the drive contact is always ON, the PLC executes communication repeatedly.
Function
Monitors operations of an inverter
Controls operations of an inverter
Reads a parameter from an inverter.
Writes a parameter to an inverter.
Writes multiple parameters to an
inverter.
Multiple inverter commands
Description
1 bit
Not Added
Not Added
None
Not Added
None
Control direction
PLCInverter
PLCInverter
PLCInverter
PLCInverter
PLCInverter
PLCInverter
4 INVERTER COMMUNICATION
Reference section
Page 103
Page 105
Page 107
Page 109
Page 111
Page 114
4.8 Programming
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