Siemens SITRANS LUT400 - Backup Level Override (2.9.1); Discrete Input Logic (2.9.2)

SITRANS LUT400
208 Operating Instructions, 07/2019, A5E33329501-AC
9.2.9.1 Backup Level Override (2.9.1)
Use this feature to override the material reading by a discrete input such as a contacting
point device. The material reading will be fixed at the programmed switch level until the
discrete input is released. The LUT400 makes decisions based on the override values.
Enable (2.9.1.1)
Enables/disables the Backup Level Override function.
Options
ENABLED
*
DISABLED
Level Override Value (2.9.1.2)
This value is substituted for the current reading when the selected discrete input is enabled
and ON.
Values
Range: 0.000 to 60.000
Default: 0.000
Value is defined in current Units (2.1.1.) (Page 168), and is valid only for level (and head
when Sensor Mode (2.1.2.) (Page 168) set to Flow). (Volume is calculated based on the
Backup level.)
Discrete Input Number (2.9.1.3)
Sets the discrete input to act as the source for a level reading override when enabled.
Options
*
DISCRETE INPUT 1
DISCRETE INPUT 2
9.2.9.2 Discrete Input Logic (2.9.2)
Use the following parameters to configure the discrete input itself.
Normal state is standard operation, with the SITRANS LUT400 sensing the material level
and controlling the pumps, and no faults or alarms present. The discrete input contacts are
either NORMALLY OPEN or NORMALLY CLOSED when the system state is normal.
Discrete Input Logic
Terminal Block
Discrete Input Scaled State
Normally Open
Voltage applied
ON
No voltage applied
OFF
Normally Closed
Voltage applied
OFF
No voltage applied
ON
For example:
When discrete input logic is set to Normally Open and discrete input has no voltage applied
on the terminal block, the discrete input will be inactive (OFF).