Yokogawa EJX930A - Manual (Page 88)

<Appendix 2. Integrator (IT) Block>
A2-4
IM 01C25T02-01E
A2.3.2 Addition
The following three options are available for addition:
• TOTAL: Adds two argument values as is.
• FORWARD: Adds two argument values, regarding a negative value as "0."
• REVERSE: Adds two argument values, regarding a positive value as "0."
You can choose these options using bit 2 and bit 3 of INTEG_OPTS as follows:
Bit 2 of INTEG_OPTS
(Flow Forward)
Bit 3 of INTEG_OPTS
(Flow Reverse)
Adder Options
H H TOTAL
L L TOTAL
H L FORWARD
L H REVERSE
The result of the adder is passed to the integrator. If only one of the inputs is connected, the value of a non-
connected input will be ignored.
When bit 7 of INTEG_OPTS (Add zero if bad) has been set, if the status of a value after addition is "Bad," the
value after addition (increment) becomes "0."
A2.4 Integrator
When addition is complete, its result will be passed to the integrator.
Integration consists of combinations of a reset method and counting up/down. There are the following seven
integration types, which can be set using INTEG_TYPE.
1. UP_AUTO: Counts up with automatic reset when TOTAL_SP is reached
2. UP_DEM: Counts up with demand reset
3. DN_AUTO: Counts down with automatic reset when zero is reached
4. DN_DEM: Counts down with demand reset
5. PERIODIC: Counts up and is reset periodically according to CLOCK_PER
6. DEMAND: Counts up and is reset on demand
7. PER&DEM: Counts up and is reset periodically or on demand
Each type of integration is independently run as a function.
There are the following four types of integrated values:
1. Total: Integrates the result of the adder as is.
2. ATotal: Integrates the absolute value of the result of the adder.
3. RTotal: Integrates the absolute value of the result of the adder only if the status of the result is "Bad."
This value is used for the RTOTAL value.
4. AccTotal: An extension function. The result of the adder is integrated as is and will not be reset.
The value is used for the ACCUM_TOTAL (expanded parameter) value.
The table A2.1 shows the details of INTEG_TYPE.