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

3 SPECIFICATIONS

3.3.2 Details of I/O 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
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I/O signals for the A/D converter modules are explained in detail below.
(1) Input signals
(1) When the programmable controller 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 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 flag
(X1) turns on.
(1) This turns on when in high resolution mode.
(1) This signal is used as an interlock condition for turning on/off Operating condition
setting request (Y9) when the following setting is changed.
• A/D conversion enable/disable setting (buffer memory address 0: Un\G0)
• CH Average time/average number of times (buffer memory address 1 to 8:
Un\G1 to Un\G8)
• Averaging process setting (buffer memory address 9: Un\G9)
(2) When Operating condition setting completed flag (X9) is off, A/D conversion
processing is not performed. Under the following conditions, 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 flag
(X9)
Operating condition
setting request (Y9)
A/D conversion
completed flag (XE)
(3) Digital outputs are cleared immediately after Operating condition setting request
(Y9) turns on. Therefore, turn on A/D conversion completed flag (XE) before reading
digital outputs.
1 A watchdog timer error occurs when the program calculations are not completed
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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