Siemens SITRANS LUT400 - Relay States; Relay Output Logic; Relay Related Parameters

General Operation
7.2 Relays
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
89
7.2.4 Relay states
The relays on the SITRANS LUT400 are programmable, allowing for many control schemes.
Relay types
Relay 1 – NO / NC (Form C)
Relay 2,3 – NO (Form A)
7.2.4.1 Relay output logic
Affects relay reaction. Reverses the logic (normally-open to normally-closed or vice versa).
Relay logic can be modified separately for alarms, and controls. (Logic for pumps cannot be
reversed.)
Function
Parameter
Relay Logic (2.8.11.) (Page 206) for Alarms (2.8.)
(Page 196)
Relay 1 Logic (2.8.11.1.) (Page 206)
Relay 2 Logic (2.8.11.2.) (Page 206)
Relay 3 Logic (2.8.11.3.) (Page 207)
Other Control
(2.11.) (Page 212)
Elapsed Time Relay (2.11.1.)
(Page 213)
Relay Logic (2.11.1.5.) (Page 213)
Time of Day Relay (2.11.2)
(Page 214)
Relay Logic (2.11.2.5.) (Page 215)
External Totalizer (2.11.3)
(Page 215)
Relay Logic (2.11.3.5.) (Page 216)
External Sampler (2.11.4.)
(Page 216)
Relay Logic (2.11.4.6.) (Page 217)
7.2.4.2 Relay related parameters
Some parameters affect how relays react during normal conditions:
Setpoints
When a setpoint is reached, the corresponding action is taken. The setpoint can be an ON or
OFF setpoint related to a process variable, or a timed setpoint based on interval and
duration.