General Operation
7.3 Discrete Inputs
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
91
Timed Setpoints
Timed setpoints are based on interval, duration, or time of day. These setpoints are set
separately for each pump within each pump control, and for each non-pump control function:
Modifiers (2.7.2.)
(Page 187)
(for Pumps (2.7.)
(Page 184))
Pump Run-On (Page 193) Run-On Interval (2.7.2.3.2.) (Page 193)
Run-On Duration Pump 1 (2.7.2.3.3.)
(Page 193)
Run-On Duration Pump 2 (2.7.2.3.4.)
Pump Start Delays (Page 193) Delay Between Starts (2.7.2.4.1.)
(Page 194)
Power Resumption Delay (2.7.2.4.2.)
Other Control
(2.11.) (Page 212)
Elapsed Time Relay (2.11.1.)
(Page 213)
Interval (2.11.1.2.) (Page 213)
Relay Duration (2.11.1.3.) (Page 213)
Time of Day Relay (2.11.2)
(Page 214)
Activation Time (2.11.2.2.) (Page 214)
Relay Duration (2.11.2.3.) (Page 214)
External Totalizer (2.11.3)
Relay Duration (2.11.3.3.) (Page 216)
External Sampler (2.11.4.)
(Page 216)
Interval (2.11.4.3.) (Page 217)
Relay Duration (2.11.4.4.) (Page 217)
7.2.5 Relays controlled by HART Communications
A relay can be controlled directly by a remote system through communications. HART
commands can be used for this purpose. An expert knowledge of HART, and the use of
HART commands is recommended. For further details on configuring relays controlled by
HART, contact your Siemens representative.
7.3 Discrete Inputs
SITRANS LUT400 has two discrete inputs to trigger or alter the way SITRANS LUT400
controls devices. A Backup Level Override, Pump Interlock, or a Switch (DI) Alarm can be
configured using discrete inputs, and discrete input logic can be reversed if necessary for the
application.
7.3.1 Backup Level Override
Backup level override provides the option of overriding the ultrasonic input (signal from a
transducer) with another contacting point level device, such as the Pointek CLS200, to
determine the level output.
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