Details Of I/O Signals - Mitsubishi MELSEC-Q Q Series User Manual

3 SPECIFICATIONS

3.3.2 Details of I/O signals

I/O signals for the A/D converter modules are explained in detail below.
(1) Input signals
Device No. Signal Name
X0 Module READY
Temperature drift
X1
compensation flag
High resolution
X8
mode status flag
Operating
X9 condition setting
completed flag
1 A watchdog timer error occurs when the program calculations are not completed
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(1) When the PLC CPU is powered on or reset, this signal turns on once the
preparation for A/D conversion has been completed, and A/D conversion
processing is then performed.
(2) When the Module READY signal is off, A/D conversion processing is not performed.
Module READY (X0) turns off in the following situations:
• During offset/gain setting mode
• When the A/D converter module has a watchdog timer error
(1) When A/D conversion processing is being performed with the temperature drift
compensation function on, the flag indicating temperature drift compensation status
(X1) turns ON.
(1) This turns ON when in high resolution mode.
(1) This is used as an interlock condition for turning the operating condition setting
request (Y9) ON/OFF when the setting for A/D conversion enable/disable (buffer
memory address 0: Un\G0) is changed.
(2) When the operating condition setting completed flag (X9) is OFF, A/D conversion
processing is not performed. Under the following conditions, the operating condition
setting completed flag (X9) turns OFF.
• When Module READY (X0) is OFF
• When operating condition setting request (Y9) is ON
Module READY (X0)
Operating condition
setting completed (X9)
Operating condition
change request (Y9)
A/D conversion
completed (XE)
within the scheduled time due to malfunctions of A/D converter module hardware.
When a watchdog timer error occurs, the RUN LED for the A/D converter module
turns off.
Description
Performed by the A/D converter module
Performed by the sequence program
MELSEC-Q
1
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