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3 SPECIFICATIONS
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2
(8) E
PROM write failure flag (XnA)
(a) This signal turns on at a failure of write of buffer memory contents to E
which starts when the E
• OFF : Completion of write to E
• ON
: Failure of write to E
ON
Yn8
OFF
XnA
OFF
Xn8
OFF
During write
2
to E PROM
2
(b) The E
PROM write failure flag turns off at normal completion of write to
2
E
PROM.
2
(c) When the E
are undefined.
Hence, powering on the PLC CPU again or resetting it with the E
write failure flag on will make the buffer memory contents undefined, causing
the Q64TC to operate with the default values.
(9) Setting change completion flag (XnB)
(a) This signal turns on after completion of reflection of buffer memory settings on
control which starts when the setting conversion command (YnB) turns on.
(b) When the setting change command (YnB) turns off, the setting change
completion flag also turns off.
ON
OFF
YnB
OFF
XnB
(10) Alert occurrence flag (XnC to XnF)
(a) This signal turns on at alarm occurrence on the corresponding channel.
Alert occurrence
Channel
1
2
3
4
(b) When an alert occurs, the alert occurrence data is stored into buffer memory
(05
to 08
) and the alert occurrence flag turns on.
H
H
OFF
Alert occurrence flag
(XnC)
Alert occurrence data
0
storage buffer
memory (05H)
2
PROM backup command (Yn8) turns on.
2
PROM
2
PROM (Write could not be completed normally)
Error detection of write to E PROM
PROM write failure flag has turned on, the E
ON
ON/OFF status
flag
XnC
OFF: Without alarm
XnD
occurrence
ON : With alarm
XnE
occurrence
XnF
ON
Detected alert data
MELSEC-Q
ON
2
2
PROM contents
Alert occurrence data storage
buffer memory address
5
6
7
8
2
PROM
2
PROM
H
H
H
H
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