Walchem W600 - Sensor Input Alarm Bitfield; Digital Input Alarm Bitfield

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5.5.3 Sensor Input Alarm Bitfield
Sensor Input Alarm Bitfield
Bit Name
Bit No.
Description
SI Types
Low
1
The sensor reading drops below the Low Alarm setpoint.
All sensor types
High
2
The sensor reading rises above the High Alarm setpoint.
All sensor types
Low Low
3
The sensor reading drops below the Low Low Alarm setpoint.
All sensor types
High High
4
The sensor reading rises above the High High Alarm setpoint.
All sensor types
Replace
Electrode †
5 Electrode in service longer than alarm time setpoint.
Corrosion sensor
only
Unused †
6
Input Failure † 7
The sensor reading is invalid (out of range, sensor fault,
wiring incorrect, sample error, or I/O card failure). This alarm
will stop the control for any output using the sensor.
All sensor types
Calibration
Required
8 The sensor requires calibration. All sensor types
† Compatibility Note: In controller software versions 3.09 and earlier, Bit 5 was used for “Out of Range”
errors and Bit 6 was used for “Sensor Fault” alarms. In software versions 3.11 and later, these alarms
are combined with other types of sensor “Input Failures” reported using Bit 7.
5.5.4 Digital Input Alarm Bitfield
Digital Input Alarm Bitfield
Bit Name
Bit No.
Description
DI Types
DI State
1
The input is in the state selected to generate an alarm.
DI State only
Total 2 The meter total exceeds the limit.
All Digital
Meters
Total Range 3 The range of the totalizer is exceeded.
All Digital
Meters
Input Failure
4
This digital input circuit is no longer functioning.
All DI Types
Flow Verify 5 Feed Monitor unable to verify chemical feed.
Flow Monitor
only
Low 6 Flowrate below the Low Alarm setpoint.
Paddlewheel
only
High 7 Flowrate above the High Alarm setpoint.
Paddlewheel
only
Unused
8