15
DISCRETE INPUT FUNCTIONS
When a Discrete Input programmed for “Call Pump 1 (2, 3, 4) Last” is closed, it assigns the respective pump to
standby status, where it will always be called to run last.
If more than one but not all of the pumps are assigned to standby status, they will all be available to run if needed,
but in a fixed order, and always after the pumps not assigned standby status.
If all the pumps are assigned to standby status, then alternation will occur normally, as though none of them were
assigned standby status.
Telemetry E - D - Functions 19 - 30
Low Level Alarm - Function 17
When a Discrete Input programmed for “Low Level Alarm“ is closed, the Low Level indicator will come on and the
Low Level Alarm relay contacts will close. This Function is for alarm and indication only and will not disable pump
operation. Also see Function 32.
High Level Alarm - Function 18
When a Discrete Input programmed for “High Level Alarm“ is closed, the High Level indicator will come on and
the High Level Alarm relay contacts will close. This Function is for alarm and indication only and will not affect
pump operation. Also see Function 38.
When the Discrete Input(s) programmed for “Telemetry E-D” are closed, no control Function in the Controller is
performed, only the status of the Discrete Inputs is placed in predetermined Coils in SCADA Registers 40001 and
40008. These Functions are use to assign any of the available Discrete Inputs to a specific Coil. See Page 28.
Call Pump 1 (2, 3, 4) Last - Functions
When a Discrete Input programmed for “Normal Pump Operation Disable” is closed, all the pumps are disabled
(not allowed to run), the Fault indicator will come on, and Fault Code 15 will be generated. However, this Function
does allow pump operation from Float Backup using Functions 32 - 38, or Level Probe Backup using Parameters
b.01 - b.07.
This Function is used when it is required that a backup system have complete control of the pumps. The Discrete
Input must be connected to contacts that closes when external logic determines that switching control of the
pumps to the backup system is necessary.
Normal Pump Operation Disable - Function 31
Float Backup - Low Level - Function 32
When a Discrete Input programmed for “Float Backup - Low Level“ is closed, the Low Level indicator will come on
and the Low Level Alarm relay contacts will close. Also see Function 17.
Pump Down Mode (Parameter P.19 = 1)
All pump operation will be disabled when the “Float Backup - Low Level“ input closes.
When the “Float Backup - Low Level“ input opens the “Pump Re-enable Delay” (set using Parameter P.37),
must expire before pump operation is allowed.
Pump Up Mode (Parameter P.19 = 2)
All available pumps will be called to run when the “Float Backup - Low Level“ input closes, assuming that the
“Float Backup - Off Level“ input is closed.
See Page 42.
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