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Rosemount Model 8800C Vortex Flowmeter with FOUNDATION
TM
Fieldbus
C-8
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
the 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 OutofService 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.
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.
Block Errors Table C-2 lists conditions reported in the BLOCK_ERR parameter.
Conditions in italics are inactive for the PID block and are given here
only for your reference.
Modes The PID function block supports the following modes:
Manual (Man)—The block output (OUT) may be set manually.
Automatic (Auto)—The SP may be set manually and the block
algorithm calculates OUT.
Cascade (Cas)—The SP is calculated in another block and is provided
to the PID block through the CAS_IN connection.
RemoteCascade (RCas)—The SP is provided by a host computer that
writes to the RCAS_IN parameter.
TABLE C-2. BLOCK_ERR Conditions.
Condition
Number
Condition Name and Description
0
Other
1
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.
2
Link Configuration Error
3
Simulate Active
4
Local Override: The actual mode is LO.
5
Device Fault State Set
6
Device Needs Maintenance Soon
7
Input Failure/Process Variable has Bad Status: The parameter linked to
IN is indicating a Bad status.
8
Output Failure
9
Memory Failure
10
Lost Static Data
11
Lost NV Data
12
Readback Check Failed
13
Device Needs Maintenance Now
14
Power Up
15
Out of Service: The actual mode is out of service.