Siemens SITRANS LUT400 Series - Discrete Input Logic

A5E33329501 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS Page 71
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General Operation
Discrete Input Logic
Discrete input logic affects the reaction of the discrete input. Normal state is standard
operation, with the SITRANS LUT400 sensing the material level and controlling the
pumps.
The contacts of the signalling device connected to the discrete inputs may be normally-
open or normally closed.
Example:
Normal state for a backup high level switch is open, and the contacts on the discrete
input are wired as normally open.
This logic can also be reversed (NORMALLY OPEN to NORMALLY CLOSED or vice versa).
Use the Discrete Input logic parameters to set the state of each discrete input.
Read the current state of discrete input 1 in
2.9.2.2. Discrete Input 1 Scaled State and the
current state of discrete input 2 in
2.9.2.4. Discrete Input 2 Scaled State .
See
Discrete inputs on page 28 for complete details on wiring the discrete inputs. To
override a level using a discrete input, see 2.9.1. Backup Level Override on page 171.
Function Parameter
2.9. Discrete Inputs
2.9.2. Discrete Input Logic 2.9.2.1. Discrete Input 1 Logic
2.9.2.3. Discrete Input 2 Logic