Alerts Function - Mitsubishi Electric MELSEC Q Series User Manual

3 SPECIFICATIONS

3.2.11 Alerts function

1) Upper limit input alert
When the process 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.
Process value (PV)
Alert set value
Alert status
Process value (PV)
Alert set value
Temperature
set value (SV)
Alert status
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(1) The alerts 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 alerts is classified as follows:
• Input alerts function ..............Upper limit input alert, lower limit input alert
• Deviation alerts function .......Upper limit deviation alert, lower limit deviation alert,
(a) Input alerts
Process value (PV)
(b) Deviation alerts
1) Upper limit deviation alert
When the deviation [process 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.
[When alert set value is positive]
Process value (PV)
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upper/lower limit deviation alert, within-range alert
2) Lower limit input alert
When the process 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.
Process value (PV)
Alert set value
Time
Alert status
[When alert set value is negative]
Process value (PV)
Temperature
set value (SV)
Alert set value
Time
Alert status
MELSEC-Q
Process value (PV)
Non-alert status Alert status
Process value (PV)
Non-alert status Alert status
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Time
Time