Mode Switching Operation And Contents That Can Be Changed; Settings That Can Be Changed With Mode Switching; Operation For Mode Switching - Mitsubishi Electric MELSEC iQ-R Series User Manual

19.1
Mode Switching Operation and Contents that can
be Changed
This section describes the settings that can be changed with the mode switching function and the operation of C24 after mode
switching.

Settings that can be changed with mode switching

The settings that can be changed with mode switching are as shown below.
Switching the communication protocol
• The communication protocol setting of each interface can be switched.
• The communication protocol after mode switching is specified with the 'Switching mode No. designation' (Un\G144/304) in
the area for designation of mode switching on the buffer memory.
Switching the transmission specifications
• The transmission setting of each interface can be switched.
• The transmission setting after mode switching is specified with the 'Transmission specifications after switching designation'
(Un\G145/305) in the area for designation of mode switching on the buffer memory.
With the mode switching function, the settings corresponding to "Communication protocol setting" and
"Transmission setting" in the parameter settings of Engineering tool can be changed.

Operation for mode switching

The following describes C24 operation for mode switching.
Processing currently in execution
• When a mode switching request is issued, the mode switching process starts immediately.
• If one of the following processing was being performed when a mode switching request was issued, the processing is
terminated.
(Data communications using the MC protocol)
Command message receive processing and response message or on-demand data transmission processing are all
terminated.
The transmission completion signal for an on-demand data transmission request is not turned ON.
(Data communications using the nonprocedural, bidirectional, or predefined protocol)
Transmit and receive processing are all terminated.
All the input signals from the CPU module related to transmit and receive processing are turned OFF.
While received data from the target device was being stored to C24, the received data up to that point is ignored and the
data is processed with the current receive data quantity treated as "0".
Modification of buffer memory stored value
• Special applications area (Un\G594 to 595/610 to 611)
The communication protocol status and transmission specifications after mode switching has been completed are stored.
The values stored to areas other than the above are not changed. The contents before mode switching are preserved.
• User setting area (Un\G1024 to 6911, 9728 to 16383)
The stored value is not changed. The contents before mode switching are preserved.
19 SWITCHING THE MODE AFTER STARTING
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19.1 Mode Switching Operation and Contents that can be Changed