ABB 2600T Series Instruction Manual page 111

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
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Description
The function of this block is in keeping with common industry practice. There is nothing to be tested here concerning the
calculation of the integral term. The following description is a guide to the use of the parameters.The basic function of the
Integrator block is to integrate an analog value over time. It can also accumulate the pulses coming from Pulse Input blocks or from
other Integrator blocks. This block is normally used to totalize flow, giving total mass or volume over a certain time, or totalize
power, giving the total energy.
Inputs
The block has two dual purpose inputs, IN_1 and IN_2. If IN_2 is not connected (does not have a corresponding link object) then
calculations for IN_2 may be omitted. Each input can receive a measurement per unit of time (rate) or an accumulated number of
pulses. The usage is as follows:
Rate - Used when the variable connected to the input is a rate, i.e., Kg/s, w, Gal/hour, etc. This input can come from the rate output
OUT of a Pulse Input block or from the output of an Analog Input block.
Accum - Used when the input comes from the OUT_ACCUM output of a Pulse Input block, which represents a continuous
accumulation of pulse counts from a transducer, or from the output of another Integrator block.
The input type is configured in the bit string parameter INTEG_OPTS. The bits corresponding to IN_1 and IN_2 can be set false for
Rate or true for Accum.
If the input option is Rate:
Each input needs a parameter to define the rate time unit: TIME_UNIT1 or TIME_UNIT2. The time units are used to convert the two
rates in units of mass, volume or energy per second The second analog input may have to be converted into the same units of the
first input. This is achieved by a unit conversion factor, given by the parameter UNIT_CONV.
Each rate, multiplied by the block execution time, gives the mass, volume or energy increment per block execution.
This increment should be added or subtracted in a register, according to some rules defined below.
The following diagram is an example of the use of two Rate inputs: