Page 138 MultiRanger 100/200 – INSTRUCTION MANUAL 7ML19981FB05
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Parameters
For IN-BOUNDS and OUT-OF-BOUNDS Relay Functions (P111 = 2 and 3 respectively), a
dead band prevents relay chatter due to material level fluctuations at both the upper and
lower setpoints.
P118 Relay Output Logic
The logic applied to relays to determine the contact open or closed state.
The relay contact operation is NORMALLY CLOSED for alarms and NORMALLY OPEN for
controls. See P111
Relay Control Function
for more information.
Power Failure
When power is cut to the MultiRanger, its relays fail to the following states:
To use relays 3 or 6 as general alarm indicators, set P118 to 3 – negative logic and wire
the alarm for normally open operation. When an alarm event occurs (see below) or when
power is cut, the circuit closes and the alarm activates.
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.
Enter the dead band in either percent
of span or units of measure (P005).
The dead band value is applied both
above and below the upper and lower
bound setpoints as shown in the fig-
ure.
Primary Index Relay
Values
Value Logic
Alarm
Contact
Pump or Control
Contact
2 * Positive Normally Closed Normally Open
3 Negative Normally Open Normally Closed
Related • P111 Relay Control Function
Relay States
Relay Fail State
1,2,4,5 Open
3,6
Open or Closed
1
1.
Relays 3 and 6 are Form C types, so you can wire it either
NORMALLY OPEN or NORMALLY CLOSED. Check the wiring
before programming.
Actual ON or OFF setpoint
Actual OFF or ON setpoint
P116
P116
Setpoint set in P112 or P113
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