Appendix IV
101
Sensors and Alarms
Your MDC2 Controller can work with the following type of sensors:
Flow Sensor: Defines an analog sensor on the logical level. The input can be analog or digital.
Flow can be summed.
Generic Sensor: Defines an analog sensor on the logical level. The input can be analog or digital.
On/Off Sensor: Defines a sensor on the logical level. The input can only be digital.
Sensor Unit of Measures
Depending on the type of sensors listed above, your sensor will be using one of the following unit of measures:
Pulse/10sec: A digital input in terms of pulses counted per 10 seconds.
mA: An analog current measurement (4-20 mA)
Alarm Triggers
Alarm triggers define what will happen when a pre-defined alarm condition is realized. These are independent of
the sensor type. Your MDC system shall take one of the following actions in an alarm situation:
Pause: Pauses the schedule specified by alarm action ID or all schedules. The pause shall take
effect immediately. This feature works only if a schedule(s) is running.
Resume: Resumes the schedule specified by alarm action ID or all schedules. The resume will take
effect immediately. This feature works only if a schedule(s) is running.
Irr. Prevent: Prevents all irrigation. The schedules will continue within the controller, but no decoders
will be activated. Currently active decoders will be stopped.
Irr. Allow: Allows previously prevented irrigation. The decoders will be activated on the next
schedule/step start. Decoders that were active on the time of “cancel inhibited irrigation”
will not be reactivated.
Irrigation Off (IrrOff): Sets the controller out of auto mode. Any running schedules will stop. Once the
“irrigation of period” is over, the controller needs to be manually put back to auto mode.
System Off: Turns the system off by taking the MDC out of Auto.
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