9-11
PPC Manual Revision 1
Alarm Latch Function
Latch 1
Latch 2
Latch 3
Latch 4
PV
Lit Lit
Contact type in the figure above: Energized when an event occurs (factory default).
Alarm hysteresis
Unlit Unlit
ON
ON ON
ONOFF
OFF
OFF
ON ONOFF OFF
Time
PV high limit
alarm setpoint
PV high limit
alarm indicator
alarm output
(no latch action)
PV high limit alarm output
of latch 1 action
PV high limit alarm output
of latch 2 action
ON ONOFF OFF
PV high limit alarm output
of latch 3 action
ON ON ON
OFF during the
sampling period
OFF
PV high limit alarm output
of latch 4 action
Release order Release order
Release order Release order
Release order
Release order
Release order
Release order
Chapter 9: Alarm Functions
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