Mitsubishi Electric MELSEC iQ-R Series User Manual page 188

Automatic modem/TA initialization (Setting with Engineering tool)
By configuring the settings for automatic modem initialization with Engineering tool, modem initialization is executed
automatically when C24 starts up.
The 'Modem initialization completion' (X10) turns ON.
■Settings for auto initialization of the modem / TA
Select "Automatically initialize" for the auto modem initialization designation of Engineering tool.
■Considerations for initializing the modem / TA automatically
● If the modem's initialization processing is completed abnormally, C24 executes the following processing.
• C24 does not turn ON the 'Initialization/connection abnormal completion' (X13).
• C24 stores an error code in the 'Modem function error code' (Un\G545).
• C24 retries the modem initialization automatically by using the initialization/connection timeout time stored in the
'Initialization/connection timeout designation' (Un\G50), and repeats it until the initialization is completed normally.
When modem initialization is not completed normally, perform the following, and restart the station where C24 is installed.
Check the set initialization data number.
Check the registered contents of the initialization data corresponding to the set initialization data number. (If any abnormal,
correct them and register them again.) Check if the power of the modem is turned ON.
● When the 'Modem disconnection request' (Y12) is used from the C24 side, the 'Modem initialization completion' (X10) turns
OFF together with the 'Connection' (X12).
When connecting to the line again, start from the modem initialization.
When the line to C24 is disconnected from the target device side, the C24's 'Modem initialization completion'
(X10) does not turn OFF.
When desiring to disable reception by the C24 side's modem, execute line disconnect by the 'Modem
disconnection request' (Y12).
7 COMMUNICATIONS BY THE MODEM FUNCTION
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7.4 Startup of the Modem Function