Siemens 200 P119 Relay Logic Test, P121 Pump by Rate MR, Positive Logic, Negative Logic

Positive Logic

In software, all relays are programmed the same way, with ON setpoints indicating when to change the relay contact state (open or closed). This parameter allows the reversal of the operation so that relay contacts can be NORMALLY CLOSED or NORMALLY OPEN.

P118 is preset to 2 which is positive logic.

Negative Logic

When P118 = 3 (negative logic), the operation for the indexed relay is reversed from normal.

P119 Relay Logic Test

Forces the relay control logic into an ACTIVATED or DE-ACTIVATED state.

Primary Index	Relay
	0	*	OFF - Control from MultiRanger algorithms
Values
	1		Activate relay control
	2		De-activate relay control
Related	•	P111 Relay Control Function
	•	P910 Toggle Relays

This parameter tests site wiring and control logic programming. Forcing the relay to an activated or de-activated state is similar to the MultiRanger detecting an event and responding to it. Helpful in testing new installations and diagnosing control problems.

Pump Setpoint Modifiers (P121 and P122) [MR 200]

Please note that these parameters apply to the MultiRanger 200 only.

These parameters provide alternate ways of starting the pumps in the pump group. See the Pump Control section on page 58 for descriptions of the pump control algorithms.

P121 Pump by Rate [MR 200]

Sets the pump relays to accept control by rate of level change once the first ON setpoint is reached.

Primary Index	Single Point Model				Dual Point Model
		Transducer			Level
Values	0	*	OFF (pump by	level)
	1		ON (pump by rate)
	•	P007	Span
Related	• P111 Relay Control Function
	• P132 Pump Start Delay
	• Rate (P700 to P708)

Use this function when multiple pumps are to be controlled by rate of level change rather than by setpoints.

7ML19981FB06 MultiRanger 100/200 – INSTRUCTION MANUAL Page 139

Parameters