Analog Voter function block parameters

0

The actual number of votes needed to trip or pre-trip. This can differ from NUM_TO_TRIP if there are bypassed inputs and the BYPASS_OPTS option A maintenance bypass reduces the number to trip is selected.

None

Parameter containing the runtime values of alarm conditions set by the block (inactive = 0, active = 1). The conditions are:

• Trip Active 

• Pre-Trip Active

• Bypass Active 

• Startup Override Active 

• Deviation Limit Exceeded 

• Expiration Reminder 

• Bypassed Input Pre-Tripped 

• Bypassed Input Tripped 

• Input Bad 

False

If BYPASSn is True, INn is excluded from voting to trip and pre-trip.

None

Configurable options for maintenance and startup bypass behavior. Options are kept in a bitstring internally. The options are:

• A maintenance bypass reduces the number to trip

• Multiple maintenance bypasses are allowed

• Maintenance bypass timeout is for indication only

• Startup bypass preset is allowed while active

• Startup bypass expires upon stabilization

• Reminder applies to startup bypass

• Startup bypass duration is event based.

• Bypass permit is not required to bypass

• Bypass permit control should be visible in operator interface

False

Must be True for any BYPASSn parameter to be True when the BYPASS_OPTS option  Bypass permit is not required to bypass is not selected. When this option is selected, the block ignores BYPASS_PERMIT.

0

(Seconds)

The number of seconds any BYPASSn can be True before the block sets all BYPASSn parameters to False unless the BYPASS_OPTS option Maintenance bypass timeout is for indication only is selected. If that is true or if the value of BYPASS_TIMEOUT is 0.0, the block will not remove bypasses.

0

(Seconds)

Countdown timer for the bypass function in seconds.

0

(Hours)

Countdown timer for the bypass function in hours.

0

(Seconds)

Countdown timer for the TRIP_DELAY and NORMAL_DELAY parameters to determine if the output is tripped or normal.

None

Configurable label for INn.

Greater Than

Determines the type of trip and pre-trip limit, either Greater Than or Less Than TRIP_LIM.

0

(Percent of scale)

The deadband in percent of IN_SCALE applied to the deviation limit for resetting the deviation condition in AVTR_ALERTS. Valid range is 0 to 50.

0

(Engineering Units)

The maximum expected difference between the highest and lowest INn values. When the limit is exceeded, AVTR_ALERTS Deviation Limit Exceeded is set.

None

(Engineering Units)

Process value in engineering units typically from a single sensor. INn is extensible from 1 to 16. The default input count is 3.

0.0 to 100.0

Scaling parameter common to all inputs.

0

(Seconds)

The number of consecutive seconds before OUT_D or PRE_OUT_D changes to the normal operation value after the number of votes to trip falls below the number required to trip or pre-trip.

2

The configured number of votes needed to initiate a trip condition.

0

The output of the block, either Normal (1) or Tripped (0) as determined by the trip vote function.

0

The value OUT_D would have if all BYPASSn parameters were False and a startup bypass were not active.

0

(Seconds)

Countdown timer for the TRIP_DELAY and NORMAL_DELAY parameters to determine if the output is pre-tripped or normal.

0

The output of the block, either Normal or Tripped as determined by the pre-trip vote function.

80

(Engineering Units)

The pre-trip limit value in engineering units compared to INn. PRE_TRIP_LIM is common to all inputs.

Normal

Indicates the status of the pre-trip vote and startup inhibit functions:

• Normal

• Pre-Tripped

• Pre-Trip Inhibited

• Voted to Pre-Trip - Delayed

• Voted Normal - Delayed

False

The result of the pre-trip limit check for INn. True indicates a vote for a pre-tripped condition, which is typically used for alarming.

0

The number of inputs that have voted to indicate pre-tripped. Bypassed inputs are not included in the total.

0

(Seconds)

The configured amount of time an alarm is active prior to the timeout of a maintenance or startup bypass timer.

None

Configurable options for block reporting features.

• Alarm conditions do not roll up to module level.

This option applies only to block alarms and events and not user-defined module alarms.

0

(Seconds)

The time configured to allow for process stabilization during a startup bypass. This is the number of consecutive seconds without a vote to trip while the startup bypass is active. Optionally, the startup bypass expires when the actual stabilization time reaches the configured allowed time.

0

(Seconds)

The actual number of consecutive seconds without a vote to trip while the startup bypass is active.

False

Inhibits trip detection during startups. On a rising edge of STARTUP, the block keeps OUT_D and PRE_OUT_D in the normal operating state for STARTUP_TIME seconds when the BYPASS_OPTS option Startup bypass duration is event based is not selected.

When the BYPASS_OPTS option Startup bypass duration is event based is selected, a startup bypass is active when STARTUP is True and inactive when STARTUP is False).

0

(Seconds)

The number of seconds the startup inhibit function is in effect following a rising edge of STARTUP.

0

(Seconds)

Countdown timer for the startup inhibit function.

Always Use Value

Determines the behavior when the status of any INn is Bad. Choices are:

• Always Use Value

• Will Not Vote if Bad

• Vote to Trip if Bad.

0

(Seconds)

The total number of seconds during a startup bypass until the inputs became and remained stable.

0

(Seconds)

The number of consecutive seconds with enough votes to trip or pre-trip before OUT_D or PRE_OUT_D changes to the trip state value.

0.5

(Percent of scale)

The deadband in percent of IN_SCALE applied to the trip limit for resetting a vote to trip or vote to pre-trip. Valid range is 0 to 50.

90

(Engineering Units)

The limit value in engineering units used to compare to INn to determine whether the input has voted to trip. TRIP_LIM is common to all inputs.

Normal

Indicates the status of the trip vote and startup inhibit functions:

• Normal

• Tripped

• Trip Inhibited

• Voted to Trip - Delayed

• Voted Normal - Delayed

False

A True value indicates INn is voting to trip.

0

The number of inputs that have voted to trip. Bypassed inputs are not included in the total.