Owner's manual

FOUNDATION
TM
Fieldbus Function Blocks
4-2
TABLE 4-1. Arithmetic Block Parameters
Index Parameter Description
1 ST_REV The revision level of the static data associated with the function block. The revision value
will increment each time a static parameter value in the block is changed.
2 TAG_DESC The user description of the intended application of the block.
3 STRATEGY The strategy field can be used to identify grouping of blocks. This data is not checked or
processed by the block.
4 ALERT_KEY The identification number of the plant unit. This information may be used in the host for
sorting alarms, etc.
5 MODE_BLK The actual, target, permitted, ad normal modes of the block. Target: The mode to “go to”,
Actual: The mode the “block is currently in”, Permitted: Allowed modes that target may
take, Normal: Most common mode for target.
6 BLOCK_ERR This parameter reflect the error status associated with the hardware or software
componets associated with a block. It is a bit string so that multiple errors may be
shown.
7PV
8 OUT The analog output value and status.
9 PRE_OUT Displays what would be the OUT value if the mode was “Auto” or lower.
10 PV_SCALE
11 OUT_RANGE The high and low scale values, engineering units code, and number of digits to the tight
of the decimal point associated with OUT.
12 GRANT_DENY 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)
13 INPUT_OPTIONS Option bit string for handling the status of the auxiliary inputs.
14 IN The block input value and status.
15 IN_LO Input of the low range transmitter, in a range extension application.
16 IN The block input value and status.
17 IN The block input value and status.
18 IN The block input value and status.
19 RANGE_HI Constant value above which the range extension has switch to the high range
transmitter.
20 RANGE_LO Constant value below which the range extension has switch to the high range
transmitter.
21 BIAS_IN_1 The bias value for IN_1.
22 GAIN_IN_1 The proportional gain (multiplier) value for IN_1.
23 BIAS_IN_2 The bias value for IN_2.
24 GAIN_IN_2 The proportional gain (multiplier) value for IN_2.
25 BIAS_IN_3 The bias value for IN_3.
26 GAIN_IN_3 The proportional gain (multiplier) value for IN_3.
27 COMP_HI_LIM Determines the high limit of the compensation input.
28 COMP_LO_LIM Determines the low limit of the compensation input.
29 ARITH_TYPE The set of 9 arithmetic functions applied as compensation to or augmentation of the
range extended input.
30 BAL_TIME 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 The bias value is used to calculate the output.
32 GAIN The gain value is used to calculate the output.
33 OUT_HI_LIM The maximum output value allowed.
34 OUT_LO_LIM The minimum output value allowed.
35 UPDATE_EVT This alert is generated by any changes to the static data.
36 BLOCK_ALM Used for all configuration, hardware, connection failure, or system problem in the block.
The cause of the alert is entered in the subcode field. The first active alarm will set the
active status in the status parameter. When the Unreported status is cleared by the alert
reporting test other block alert may be reported without clearing the Active status, if the
subcode has changed.