19 SWITCHING THE MODE AFTER STARTING
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19 SWITCHING THE MODE AFTER STARTING
This function forcefully switches the current communication protocol and transmission specifications of a designated interface
from a target device and by program after C24 starts up.
C24 starts operating with the setting values in "Module Parameter" of Engineering tool at the time of the startup.
This function is used to change the communication protocol and transmission specification of the designated
interface and continue data communications without restarting the CPU module. For mode switching by using
the dedicated instruction (UINI instruction) or the module FB (InitialUnit instruction), refer to the following
section.
Page 520 Dedicated Instructions
MELSEC iQ-R Serial Communication Module Function Block Reference
Mode switching from target device
• Mode switching can be performed when the communication protocol of an interface connected to the target device is the
MC protocol.
• The communication protocol can be changed from the MC protocol as shown below.
• The transmission specifications set with the parameter setting of Engineering tool can be changed.
Mode switching by program
• Regardless of the current communication protocol of an interface connected to the target device, mode switching can be
performed by program.
• The communication program can be changed by program as shown below.
• The transmission specifications set with the parameter setting of Engineering tool can be changed.
When using the mode switching function, set "Setting change" of the Engineering tool parameter settings (by
selecting [Basic settings] [Various control specification][Transmission Setting]) to "Enable".
(Format switching)
MC protocol
(Formats 1 to 5)
Bidirectional protocol
Nonprocedural protocol
MELSOFT connection
Predefined protocol
(Format switching)
MC protocol
(Formats 1 to 5)
Nonprocedural protocol
Bidirectional protocol
Predefined protocol
MELSOFT connection
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