The nine arithmetic functions are: flow compensation linear, flow compensation
square root, flow compensation approximate, BTU flow, traditional multiply and
divide, average, summer, fourth order polynomial, and simple HTG compensate
level.
This arithmetic function block supports mode control (Auto, Manual, or Out of
Service). There is no standard alarm detection in this block.
Table 8-28: Arithmetic (ARTHM) Block
Index number Parameter Units Description
4 ALERT_KEY None The identification number of the plant
unit. This information may be used in the
host for sorting alarms, etc.
29 ARITH_TYPE None The set of 9 arithmetic functions applied
as compensation to or augmentation of
the range extended input.
30 BAL_TIME Seconds Specifies the time for a block value to
match an input, output, or calculated
value or the time for dissipation of the
internal balancing bias.
31 BIAS None The bias value.
21 BIAS_IN_1 None The bias value for IN_1.
23 BIAS_IN_2 None The bias value for IN_2.
25 BIAS_IN_3 None The bias value for IN_3.
36 BLOCK_ALM None This block alarm is used for all
configuration, hardware, connection
failure, or system problems in the block.
The cause of the alert is entered in the
subcode field. The first alert to become
active will set the Active status in the
Status parameter. As soon as the
Unreported status is cleared by the alert
reporting task, another block alert may be
reported without clearing the Active
status, if the subcode has changed.
6 BLOCK_ERR None The summary of active error conditions
associated with the block. The possible
block errors are Block configuration
error, Simulate active, Local
override, Input failure/process
variable has Bad status, Output
failure, Readback failed, Out of
service, and Other. Each function block
reports none or a subset of these error
conditions.
27 COMP_HI_LIM EU of PV Determines the high limit of the
compensation input.
Manual FOUNDATION
™
Fieldbus
00809-0500-4880 December 2022
Rosemount OCX8800A 195
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