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MELSEC-Q
3 SPECIFICATIONS
3.5.3 Alert definition (buffer memory address 5, 6: Un\G5, Un\G6)
(1) The bit associated with the alert detected on the corresponding channel turns to
"1".
When the cause of the detected alert is removed, the corresponding bit turns to
"0".
Associated bit
number
Alert definition
b0 PV rose above the upper limit* of the preset input range.
b1 PV fell below the upper limit* of the preset input range.
b2 to b7 Unused
b8 Alert 1 turned on.
b9 Alert 2 turned on.
b10 Alert 3 turned on.
b11 Alert 4 turned on.
b12 Unused
b13 Loop disconnection was detected.
b14 Unused
b15 Unused
(2) When each alert detects errors during control, the control is continued. Output
does not turn OFF.
3.5.4 Measured value (PV value) (buffer memory address 9,10: Un\G9, Un\G10)
(1) Stores the Q62HLC-detected value on which the following processings have
been performed:
• Linearization
• Sensor compensation
(2) This flag checks whether the measured value (PV) is within approach band.
(3) This flag turns to "1" when the measured value (PV) is within approach band.
Setting the soak time criteria (buffer memory address:168) will cause this flag to
turn to "1" when the measured value remains within approach band for the set
time.
3.5.5 Manipulated value (MV value) (buffer memory address 13, 14: Un\G13, Un\G14)
(1) The result of PID operations, which are performed based on the measured
value, is stored.
(2) The value stored is in the range -50 to 1050 (-5.0% to 105.0%).
(3) The manipulated value is % to full-scale (16mA) of output range (4 to 20mA).
0% outputs 4mA, 50% outputs 12mA and 100% outputs 20 mA.
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