ABB AX416 User Manual page 39

Single and Dual Input Analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468
Note. The following examples illustrate
defined set point.
Low Alarm Actions
defined set point.
Process Variable
Relay De-energized, LED On
Fig. 5.2 High Failsafe Alarm without Hysteresis and Delay
Process Variable
Relay De-energized, LED On
Fig. 5.3 High Failsafe Alarm with Hysteresis but no Delay
Process Variable
Delay
Relay De-energized, LED On
Fig. 5.4 High Failsafe Alarm with Hysteresis and Delay
IM/AX4PH Issue 9
, i.e. the alarm is activated when the process variable exceeds the
High Alarm Actions
are the same, except the alarm is activated when the process variable drops below the
High Set Point
Relay Energized,
LED Off
High Set Point
Hysteresis
Relay Energized,
LED Off
High Set Point
Hysteresis
Relay Energized,
LED Off
Process Variable
Relay Energized, LED On
Fig. 5.5 High Non-Failsafe Alarm without Delay and Hysteresis
Process Variable
Delay
Relay De-energized, LED On
Fig. 5.6 High Failsafe Alarm with Delay but no Hysteresis
5 PROGRAMMING
High Set Point
Relay De-energized,
LED Off
High Set Point
Relay Energized,
LED Off
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