Yokogawa AXFA14G/C - Manual (Page 65)

IM 01E20F02-01E A-6
APPENDIX 2. INTEGRATOR (IT) BLOCK
APPENDIX 2. INTEGRATOR (IT) BLOCK
IN_1: Block input 1 (value and status)
IN_2: Block input 2 (value and status)
REV_FLOW1: Indicates whether the sign of IN_1 is
reversed. It is a discrete signal.
REV_FLOW2: Indicates whether the sign of IN_2 is
reversed. It is a discrete signal.
RESET_IN: Resets the integrated values. It is a
discrete signal.
RESET_CONFIRM: Reset confirmation input. It is a
discrete signal.
OUT: Block output (value and status)
OUT_PTRIP: Set if the target value exceeds
PRE_TRIP. It is a discrete signal.
OUT_TRIP: Set if the target value exceeds
TOTAL_SP (or 0). It is a discrete signal.
The Integrator (IT) block adds two main inputs and
integrates them for output. The block compares the
integrated or accumulated value to TOTAL_SP and
PRE_TRIP and generates discrete output signals
OUT_TRIP or OUT_PTRIP when the limits are
reached.
The output is as represented by the following equation
(for counting upward and rate conversion).
OUT.Value = Integration start value + Total
Total = Total + Current Integral
Current Integral = (x + y)
ϫ ∆t
x: IN_1 value whose unit has been converted
y: IN_2 value whose unit has been converted
∆t: block execution period
A2.1 Schematic Diagram of Integrator Block
The following shows the schematic diagram of the Integrator block.
OUT
IN_1
RESET_IN
REV_FLOW1
–1
TIME_UNIT2
IN_2
REV_FLOW2 PULSE_VAL2
–1
UNIT_CONV
OP_CMD_INT
(RESET)
INTEG_OPTS
(CARRY)
Reverse
Forward
Forward
OUT_PTRIP
OUT_TRIP
INTEG_OPTS
(FLOW TYPE)
Add
Compare
Compare
TOTAL / RTOTAL
Integrate
INTEG_TYPE
INTEG_OPTS (QUALITY)
GOOD_LIM
UNCERT_LIM
CLOCK_PER
N_RESET
MAN
MAN
MAN
Convert Rate
Convert Accum
Convert Rate
Convert Accum
TOTAL_SP
PRE_TRIP
INTEG_OPTS
(INPUT TYPE)
PULSE_VAL1
TIME_UNIT1
INTEG_OPTS
(INPUT TYPE)
RESET_CONFIRM
Reverse
FA0201.EPS
Figure A2.1 Integrator Block
The Integrator block is classified into the following
five sections for each function:
• Input process section: Determines the input value
status, converts the rate and accumulation,
and determines the input flow direction.
• Adder: Adds the two inputs.
• Integrator: Integrates the result of the adder into the
integrated value.
• Output process section: Determines the status and
value of each output parameter.
• Reset process section: Resets the integrated values.