Relay States; Relay Output Logic; Relay Related Parameters - Siemens SITRANS L 7ML5400 Operating Instructions Manual

Communications relays
Relays controlled by communications (HART) are not affected by a fail-safe condition.
7.2.4

Relay states

The relays on the SITRANS LUT400 are programmable, allowing for many control schemes.
Relay types
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
Relay Logic (2.8.11.) (Page 210) for Alarms (2.8.)
(Page 200)
Other Control
(2.11.) (Page 216)
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.
SITRANS LUT400
Operating Instructions, 04/2021, A5E33329501-AG
Relay 1 – NO / NC (Form C)
Relay 2,3 – NO (Form A)
Elapsed Time Relay (2.11.1.)
(Page 216)
Time of Day Relay (2.11.2)
(Page 218)
External Totalizer (2.11.3)
(Page 219)
External Sampler (2.11.4.)
(Page 220)
General Operation
Parameter
Relay 1 Logic (2.8.11.1.) (Page 210)
Relay 2 Logic (2.8.11.2.) (Page 210)
Relay 3 Logic (2.8.11.3.) (Page 210)
Relay Logic (2.11.1.5.) (Page 217)
Relay Logic (2.11.2.5.) (Page 219)
Relay Logic (2.11.3.5.) (Page 220)
Relay Logic (2.11.4.6.) (Page 221)
7.2 Relays
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