<Appendix 3. Arithmetic (Ar) Block>
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IM 01E21A02-03EN
A3.5 List of the Arithmetic Block Parameters
Relative
Index Parameter Name
Write
mode
Valid
Range
Default
Value
Description / Remarks
0
BLOCK_
HEADER
O/S
TAG=“AR”
Information on this block such as block tag, DD
revision, and execution time.
1
ST_REV
0
Indicates the revision level of the set parameters
associated with the Arithmetic function block. This
revision is updated if the setting value is changed.
Used to check for parameter change, etc.
2
TAG_DESC
Null
Universal parameter to store a comment explaining
tag contents.
3
STRATEGY
1
Universal parameter intended to be used for the
high-level system to separate function blocks.
4
ALERT_KEY
1-255
1
Key information to identify where an alert takes
place. Generally, this parameter is used by the
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.
5
MODE_BLK
AUTO
Universal parameter to show a block operation
state. Consists of Actual mode, Target mode,
Permit mode and Normal mode.
6
BLOCK_ERR
0
Indicates the error statuses related to the own
block. The bit used by the AR function block is as
follows:
bit1: Block Configuration Error
bit15: O/S Mode
7
PV
0
The result of a range extension function is
substituted into this.
From the viewpoint of the computing equation, PV
is the main input.
8
OUT
MAN
0
Output
9
PRE_OUT
0
Always indicates the calculation result. The value is
substituted into OUT in the AUTO mode.
10
PV_SCALE
O/S
Indicates PV scaling. (for making a memo)
11
OUT_RANGE
Output scaling for the host (for making a memo)
12
GRANT_DENY
0
The parameter for checking if various operations
have been executed. Set a bit corresponding to the
GRANT parameter before various operations are
executed. Check the DENY parameter after the
operation. If the bit for the operation is not set, it
indicates that the operation was executed.
