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MELSEC-Q
3 SPECIFICATIONS
(9) Setting change completion flag (XnB)
(a) This signal turns on the setting change 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 (XnB) also turns off.
YnB
XnB
ON
OFF
OFF
ON
(10) Alert occurrence flag (XnC, XnD)
(a) This signal turns on at alarm occurrence on the corresponding channel.
Channel
Alert occurrence
flag
ON/OFF status
Alert occurrence data buffer
memory address
1 XnC 5H
2 XnD
OFF: Without alarm
occurrence
ON : With alarm
occurrence
6
H
(b) When an alert occurs, the alert occurrence data is stored into alert definition
(buffer memory address: 5, 6) and the alert occurrence flag (XnC, XnD)
turns on.
Alert occurrence flag
(XnC)
OFF
ON
Buffer memory
address : 5
0
Detected alarm data
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