ABB 2600T Series Instruction Manual page 112

112 2 6 0 0 T S E R I E S | P R E S S U R E T R A N S M I T T E R S | O I/ 2 6 6/ F F - E N R E V. E
If the input option is Accum:
A counter input normally comes from a Pulse Input block OUT_ACCUM. It can also be connected to the output of another integrator
block. The OUT_ACCUM of the Pulse Input block represents a continuous accumulation of pulses from the flow transducer, while
the output OUT of an Integrator represents an integration or accumulation of analog inputs.
The Integrator block should determine the number of additional counts from the counter input readings since the last execution.
As the output ACCUM_OUT of the Pulse Input block wraps up when the counting reaches 999,999 and does not increment or
decrement by more than 499,999 per cycle, the difference in counts is determined as follows:
a) If the difference between the reading in one cycle and the reading in the preceding cycle is less than 500,000 or greater than
(-500,000), the difference should be taken as the variation.
b) If the difference between the reading in one cycle and the reading in the preceding cycle is greater than or equal to
(+500,000), add (-1,000,000) and use the result as the variation.
c) If the difference between the reading in one cycle and the reading in the preceding cycle is more negative than or equal to
(-500,000), add (+1,000,000) and use the result as the variation.
If the output OUT of another integrator block is used, that block should be programmed to obey the rules listed above.
The variation of each input should be multiplied by the value, in engineering units, of each pulse given by PULSE_VAL1 or PULSE_
VAL2, as appropriate. The result is the increment in engineering units of, for example, mass, volume or energy per block execution.
Example: