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MELSEC-Q
3 SPECIFICATIONS
3.3.2 Details of I/O signals
I/O signals for the A/D conversion modules are explained in detail below.
(1) Input signals
Device No.
Signal Name
Description
X0
Module READY
(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 conversion module has a watchdog timer error 1
X1
Temperature drift
compensation flag
(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.
X9
Operating
condition setting
completed flag
(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
A/D conversion
completed (XE)
Module READY (X0)
Operating condition
setting completed (X9)
Operating condition
change request (Y9)
XA
Offset/gain setting
mode flag
(1) This is used as an interlock condition for setting the offset/gain request (YA) to
ON/OFF when registering the value after adjustment of the offset/gain settings have
been completed.
(2) See Section 4.6 regarding the offset/gain settings.
OFF
Module READY (X0)
Offset/gain setting mode flag (XA)
User range write request (YA)
1 A watchdog timer error occurs when the program calculations are not completed
within the scheduled time due to malfunctions of A/D conversion module
hardware. When a watchdog timer error occurs, the RUN LED for the A/D
conversion module turns off.
Summary of Contents for Q64AD
Page 11: ...1 2 MELSEC Q 1 OVERVIEW MEMO...
Page 13: ...2 2 MELSEC Q 2 SYSTEM CONFIGURATION MEMO...
Page 31: ...3 18 MELSEC Q 3 SPECIFICATIONS MEMO...
Page 43: ...4 12 MELSEC Q 4 SETUP AND PROCEDURES BEFORE OPERATION MEMO...
Page 61: ...5 18 MELSEC Q 5 UTILITY PACKAGE SW0D5C QADU E MEMO...
Page 67: ...6 6 MELSEC Q 6 PROGRAMMING MEMO...
Page 76: ...Index 3 MEMO...
