Emerson Rosemount OCX 8800, Instruction Manual

Page: 176 / 306

Section 7: Foundation
Fieldbus
April 2017
Instruction Manual
IM-106-880C, OI
15
0
Arithmetic (ARTHM) Function
Block
Table 7-31 Arithmetic (ARTHM) Block
4 ALERT_KEY None The identification number of the plant unit. This information may be used in
the host fro 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, and other 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_LI
M
28 COMP_LO_LI
M
EU of PV Determines the high limit of the compensation input.
EU of PV . Determines the low limit of the compensation input.
32 GAIN None The proportional gain (multiplier) value.
22 GAIN_IN_1 None The proportional gain (multiplier) value for IN_1.
24 GAIN_IN_2 None The proportional gain (multiplier) value for IN_2.
26 GAIN_IN_3 None The proportional gain (multiplier) value for IN_3.
12 GRANT_DENY None Options for controlling access of host computers and local control panels to
operating, tuning, and alarm parameters of the block. Not used by the device.
14 IN Determined by source
or EU of PV _SCALE
16 IN_1 Determined by
supplying block or
source.
17 IN_2 Determined by
supplying block or
source.
18 IN_3 Determined by
supplying block or
source.
The analog input value and status. The number of inputs is an extensible
parameter in some function blocks.
The first analog input value and status.
The second analog input value and status.
The third analog input value and status.
15 IN_LO None The value used for the input whenever IN is below range.
13 INPUT_OPTS None Sets the options for using IN, IN_LO, IN_1, IN_2 and IN_3 when any are either
Bad or Uncertain.
5 MODE_BLK None The mode record of the block. MODE contains the actual, target, permitted,
and normal modes. In some function blocks, this parameter is used to request
and show the source of the setpoint, the source of the output, and/or the
block operating state.
Index
Number Parameter Units Description