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3 SPECIFICATIONS
3.4.2 Input signal functions
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(1) Module ready flag (Xn0)
(a) This signal turns on as soon as the Q64TC is ready when the PLC CPU is
powered on or reset.
(b) Read/write of Q64TC buffer memory data from the PLC CPU is performed
when the temperature control module ready flag is on.
Write command
(c) This signal turns off on detection of a watchdog timer error. The Q64TC stops
temperature control operation and turns off the output.
(2) Setting/operation mode status (Xn1)
This signal turns on in the operation mode and turns off in the setting mode.
Do not change the set value during mode shift processing.
Yn1
Xn1
Setting mode
(3) Write error flag (Xn2)
This signal turns on at write error occurrence.
A write error occurs under any of the following conditions.
• When data is set to the reserved area.
• When a setting change made to the area write-enabled in the setting mode only
is made in the operation mode.
• When data outside the setting range is set.
• When data setting is changed during default setting registration.
(4) Hardware (H/W) error flag (Xn3)
This signal turns on when the temperature control module results in a hardware
error.
X1
Used as buffer memory read/write interlock.
Operation mode
During mode
shift processing
MELSEC-Q
TOP H0
H22
K100
K1
Setting mode
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