Allen-Bradley ProcessLogix 1756-IA16, Reference Manual, Page: 47 / 120

Publication 1757-RM810A-EN-P - May 2002
Functional Blocks 3-7
TOTALIZER
Description Periodically adds an input value (P1) to an accumulator value (PV); sets status flags to indicate when accumulator
value is “near”, “nearer”, “nearest” the user specified target value.
Function Typically used to accumulate flows. For situations where flow transmitter may not be precisely calibrated near
zero-flow value, a zero-flow cutoff feature is provided such that when P1 is below the cutoff value it clamps to 0
(zero).
Block also supports warm restart.
Input One input (P1) is required:
•
P1 is the value to be accumulated -- input value may be real, integer or Boolean, but is stored as a real number.
•
P1 must be fetched from another block.
•
Number of process input connections is 1.
Outputs The following outputs are produced:
•
Accumulated value (PV) and its status (PVSTS), as well as a Boolean flag, PVSTSFL.BAD, to indicate to other
function blocks, that this block’s PV status is bad.
•
Flags, indicating if accumulated value has reached user-specified target value or one of the accumulator deviation
trip points (ACCTVFL and ACCDEV.FL(1-4]).
Equations You can configure PVEQN to specify how the block should handle bad input and warm restarts. Specific handling
combinations for a given PVEQN selection are:
Equation Bad Input Handling Warm Restart Handling
EqA Stop accumulation while input is bad Continue after input turns valid
EqB Use last good value if input is bad Continue after input turns valid
EqC Stop if the input is bad and set PV to NaN Continue after input turns valid
EqD Stop accumulation while input is bad Stop after a warm restart
EqE Use last good value if input is bad Stop after a warm restart
EqF Stop if the input is bad and set PV to NaN Stop after a warm restart
Parameters ACCDEV.FL [1..4]
ACCDEV.TP [1..4]
ACCTV
ACCTVFL
CI
CMDATTR
COMMAND
CUTOFF.LM DELTATIME
DESC
LASTGOOD
OLDAV
ORDERINCM
P1
P1STS
PV PVEQN
PVFORMAT
PVSTS
PVSTSFL.BAD
PVSTSFL.MAN
PVSTSFL.NORM
PVSTSFL.UNCER
PVVALSTS RESETFL
RESETVAL
STARTFL
STATE
STOPFL
TIMEBASE
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