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Instruction Manual
IM-106-880C, OI
September 2009
Hazardous Area OCX 8800
7-52
Table 7-29. 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 thehost
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_LIM EU of PV Determines the high limit of the compensation input.
28 COMP_LO_LI
M
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
The analog input value and status. The number of inputs is an extensible parameter
in some function blocks.
16 IN_1 Determined by supplying
block or source.
The first analog input value and status.
17 IN_2 Determined by supplying
block or source.
The second analog input value and status.
18 IN_3 Determined by supplying
block or source.
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.
8 OUT EU of OUT_SCALE or
Percent or EU of IN
The analog output value and status. The number of outputs is an extensible
parameter in some blocks.
33 OUT_HI_LIM EU of OUT_SCALE
Supplied by IN
The maximum output value allowed.
34 OUT_LO_LIM EU of OUT_RANGE or
Supplied by IN
The minimum output value allowed.
11 OUT_RANGE None Range of the output.
9 PRE_OUT EU of OUT The pre-trip limit from SP or zero.
7 PV EU of OUT or EU of
PV_SCALE
The process variable used in block execution and alarm limit detection.