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Manual
00809-0500-4881
Figure 8-16: PID Equation Structure
Where:
GAIN
e
s
8.9.3
Reverse and direct action
To configure the block output action, enable the Direct Acting control option. This option
defines the relationship between a change in PV and a corresponding change in output.
With Direct Acting enabled (True), an increase in PV results in an increase in the output.
You can set control options in Manual or Out of Service mode only.
Note
Track Enable, Track in Manual, SP-PV Track in Man, SP-PV Track in LO or IMAN, Use PV for
BKCAL_OUT, and Direct Acting are the only control options supported by the PID function
block. Unsupported options are not grayed out; they appear on the screen in the same
manner as supported options.
8.9.4
Reset limiting
The PID function block provides a modified version of feedback reset limiting that prevents
windup when output or input limits are encountered and provides the proper behavior in
selector applications.
8.9.5
Block errors
Table 8-26
Table 8-26: BLOCK_ERR Conditions
Condition
number
0
1
2
3
4
5
6
7
8
Rosemount OCX8800C
Proportional gain value
Error
A place operator
lists conditions reported in the BLOCK_ERR parameter.
Condition name and description
Other
Block Configuration Error: The BY_PASS parameter is not configured and is set
to 0, the SP_HI_LIM is less than the SP_LO_LIM, or the OUT_HI_LIM is less than
the OUT_LO_LIM.
Link Configuration Error
Simulate Active
Local Override: The actual mode is LO.
Device Fault State Set
Device Needs Maintenance Soon
Input Failure/Process Variable has Bad Status: The parameter linking to IN is
indicating a Bad status.
Output Failure
F
Fieldbus
™
OUNDATION
April 2023
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