IM 01E20F02-01E
A-22
APPENDIX 3. ARITHMETIC (AR) BLOCK
A3.5 List of the Arithmetic Block Parameters
TA0305-01.EPS
Relative
Index
Parameter
Write Mode Valid Range Initial Value
View
2
1
3
5
5
5
5
5
5
5
4
4
O/S
MAN
O/S
2
11
2
2 2
BLOCK_HEADER
TAG_DESC
4
4
MODE_BLK
OUT
OUT_RANGE
IN_LO
IN_1
IN_2
IN_3
ST_REV
IN
TAG=“AR”
2
STRATEGY
5
5
PV
2
2
BLOCK_ERR
5
5
PRE_OUT
2
GRANT_DENY
11
PV_SCALE
RANGE_HI
4
4
4
RANGE_LO
BIAS_IN_1
GAIN_IN_1
4
4
4
4
4
BIAS_IN_2
GAIN_IN_2
BIAS_IN_3
GAIN_IN_3
COMP_HI_LIM
4
COMP_LO_LIM
ALERT_KEY
1-255
1
0
2
8
15
16
17
18
14
5
11
1
3
7
6
9
12
10
19
20
21
22
23
24
25
26
27
28
4
0
Null
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
+INF
-INF
1
AUTO
13
INPUT_OPTS
0
2
Description / Remarks
Information relating to this function block, such as block tag, DD revision, and execution time
A universal parameter that stores comments describing tag information
Block output
Always indicates the calculation result. The value is substituted into OUT in Auto mode.
Indicates PV scaling (for making a memo).
Output scaling for the host (for making a memo)
Function
Bit
0
1
2
3
4
5
6
7
8 to 15
Handles IN as “good” input if its status is “uncertain.”
Handles IN_LO as “good” input if its status is “uncertain.”
Handles IN_1 as “good” input if its status is “uncertain.”
Handles IN_1 as “good” input if its status is “bad.”
Handles IN_2 as “good” input if its status is “uncertain.”
Handles IN_2 as “good” input if its status is “bad.”
Handles IN_3 as “good” input if its status is “uncertain.”
Handles IN_3 as “good” input if its status is “bad.”
Reserved
Input block
Auxiliary input 1
Auxiliary input 2
Auxiliary input 3
High limit for switching to a high-range transmitter by the range extension function.
Low limit for switching to a low-range transmitter by the range extension function.
IN_1 bias
IN_1 gain
IN_2 bias
IN_2 gain
IN_3 bias
IN_3 gain
High limit of compensation factor f
Low limit of compensation factor f
A universal parameter intended for use by a high-level system to identify function
blocks
A universal parameter representing the operation status of the Arithmetic block. It
consists of the Actual, Target, Permit, and Normal modes.
The result of a range extension function is substituted into this.
When viewed from the computing equation, PV is the main input.
Input for a low-range transmitter.
This is used for the range extension function.
Determines whether an input is used as a “good” input when the input status is "bad"
or “uncertain.”
Indicates the error status relating to the Arithmetic block.
The bit used by this function block is as follows:
Bit 1: Block Configuration Error
Bit 15: O/S mode
The parameter used to check if various operations have been executed. The bits in
the GRANT parameter corresponding to various operations are set before any of
them are executed. After the operations are complete, the DENY parameter is
checked to find out if any bit corresponding to the relevant operation has been set. If
no bit has been set, it is evident that the operations have been executed successfully.
Indicates the revision level of the set parameters associated with the Arithmetic
block. If a setting is modified, this revision is updated. It is used to check for
parameter changes, etc.
Key information used to identify the location at which an alert has occurred.
Generally, this parameter is used by a high-level system to identify specific areas in a
plant that are under the control of specific operators, to separate necessary alerts
only. This is one of the universal parameters.
