Global Function: For Serial Communication Modules - Mitsubishi MELSEC Q Series Reference Manual

3.10 Global Function: for Serial Communication Modules

3.10.1 Commands and contents of the character area
—
(subcommand)
Function
Global signal
OFF
Global
Global signal
ON
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3 WHEN COMMUNICATING USING THE QnA COMPATIBLE 3E/3C/4C FRAMES OR 4E FRAME
The global function turns global signals (X1A/X1B) of the programmable controller
CPU of the C24 loaded station connected to an external device over a multidrop link
on/off.
This function is used to set for emergency instructions, simultaneous startup, and data
communication enable/disable interlock signals issued to the programmable controller
CPU.
The following examples describe the control procedure for using the global function.
POINT
(1) When an external device issues the GW command by an A compatible 1C
frame to a computer link module on a station connected by multidrop link, the
global signal (input signal) X1A or X1B is turned on/off on that interface on the
serial communication module of the Q/L/QnACPU station.
(Example)
When the GW command was received from the C24 CH1 interface, the
C24 turns X1A on/off.
(2) When the global function is issued to an ACPU + C24 station connected over
a multidrop link, the ACPU X2 signal is turned on/off.
(3) When the programmable controller CPU is restarted after the global signal is
turned either on or off, the global signal is turned off.
(4) The function can only be used with the Q/L/QnACPU + C24 stations (including
stations connected by multidrop) connected to an external device.
Other ACPU + C24 stations connected over a network system cannot use this
function.
The following explains the commands and contents of the character area (data section
during communication in binary code) in the control procedure when an external device
turns on/off the global signals of the C24.
(1) Commands
Command
1618 (0000)
1618 (0001)
in the programmable controller CPU status field in the table above indicates that execution is possible.
Processing
Turns off the global signal.
Turns on the global signal.
Programmable controller CPU
status
During RUN
During
Write Write
STOP
enabled disabled
Reference
Section 3.10.2
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