Global Function - Mitsubishi Electric MELSEC IQ-R series Reference Manual

13.2

Global Function

The global function is a function to turn ON/OFF the global signals (input signals: X1A/X1B) of serial communication module
connected to external devices with the multidrop communications.
This is used as interlock signals for emergency command, simultaneous startup, and applicability of data transmission/
reception to CPU modules.
The command can only be used for C24 (including multidrop connection station) connected to the external
device. It cannot be used via network.
The global signal is turned OFF by powering OFF, resetting, or switching the mode of CPU module.
Compatibility with global function of Computer link module
This function (command: 1618) is compatible with GW command for dedicated protocol of Computer link module.
■Operation of serial communication module when GW command is received
When GW command is executed from Computer link module connected with the multidrop connection, the global signal (input
signal: X1A/X1B) at the side where the command was received turns ON/OFF.
• Received from CH1: X1A
• Received from CH2: X1B
■Command: Operation of computer link module when 1618 is received
When this function (command: 1618) is used to Computer link module, the global signal (input signal: X2) of Computer link
module turns ON/OFF.
13 SERIAL COMMUNICATION MODULE DEDICATED COMMANDS
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13.2 Global Function
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