Mitsubishi Q Series User Manual

3 - 18 3 - 18
MELSEC-Q
3 SPECIFICATIONS
3.2.10 Alert function
(1) The alert function is a function which sets the system in an alert status when the
process value (PV) or deviation reaches the alert set value. It is used to turn on
the device's hazard signal or operate the safety device.
The alert function is classified as follows:
• Input alerts ............. Upper limit input alert, lower limit input alert
• Deviation alerts...... Upper limit deviation alert, lower limit deviation alert,
upper/lower limit deviation alert, within-range alert
If an alert occurs during the control, the control continues its operation. Output
doesn't turn off.
(a) Input alerts
1) Upper limit input alert
When the measured value (PV) is equal to or greater
than the alert set value, the system is put in an alert
status. The setting range is the same as the input
range.
2) Lower limit input alert
When the measured value (PV) is equal to or
less than the alert set value, the system is put in
an alert status. The setting range is the same as
the input range.
Time
Measured value (PV)
Alert status
Alert set value
Process value (PV)
Time
Measured value (PV)
Alert status
Alert set value
Non-alert status Alert status
Process value (PV)
(b) Deviation alerts
1) Upper limit deviation alert
When the deviation [measured value (PV) - set value (SV)] is equal to or
greater than the alert set value, the system is put in an alert status.
The setting range is
full-scale.
Non-alert status Alert status
[When alert set value is positive]
Time
Measured value (PV)
Alert status
Alert set value
Temperature
set value (SV)
Measured value (PV)
Time
Measured value (PV)
Alert status
Alert set value
Measured value (PV)
Temperature
set value (SV)
[When alert set value is negative]

Mitsubishi Q Series Specifications

General

Brand	Mitsubishi
Model	Q Series
Category	Control Unit
Language	English