Mitsubishi Electric MELSEC Q Series User Manual page 66

3 SPECIFICATIONS
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(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 E
• OFF : Completion of write to E
• ON : Failure of write to E
ON
2
E PROM backup
OFF
start command (Yn8)
2
E PROM write
OFF
completion flag (Xn8)
2
E PROM write
OFF
failure flag (XnA)
2
(b) E PROM write failure flag (XnA) turns off at normal completion of write to
2
E PROM.
(c) When E
are undefined.
Hence, powering on the programmable controller CPU again or resetting it
with the E
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 Setting change command (YnB) turns on.
(b) When Setting change command (YnB) turns off, Setting change completion
flag (YnB) also turns off.
Setting change
OFF
command (YnB)
Setting change
OFF
completion flag (XnB)
(10) Alert occurrence flag (XnC to XnF)
(a) This signal turns on at alarm occurrence on the corresponding channel.
Channel
1
2
3
4
(b) When an alert occurs, the alert definition is stored into Alert definition (buffer
memory address: 5
CH1 Alert flag (XnC)
Alert defintion
(buffer memory address: 5
search engine
2
PROM backup start command (Yn8) turns on.
2
PROM
2
PROM (Write could not be completed normally)
During write
2
to E PROM Error detection of write to E
2
PROM write failure flag (XnA) has turned on, the E
2
PROM write failure flag on will make the buffer memory contents
ON
ON
Alert occurrence
ON/OFF status
flag
XnC OFF: Without alarm
XnD occurrence
ON : With alarm
XnE
occurrence
XnF
to 8 ) and the alert occurrence flag turns on.
H H
OFF
0
)
H
MELSEC-Q
ON
2
PROM
2
PROM contents
Alert definition
(buffer memory address)
5
H
6
H
7
H
8
H
ON
Detected alert data
2
PROM
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