Emerson Micro Motion 3711 Configuration And Use Manual page 111

PID Control Loops
Figure 10-1 PID Loop window
Control Type = Primary Only
3. Assign a tag to this PID loop. The tag can contain up to 10 characters.
4. Specify
Control Type
•
Primary Only
•
Override Control
configured and used.
5. Set
Output Type
•
Analog
is disabled (see Section 6.5).
•
Discrete
outputs are available on the system (see Section 7.3), that sampler control is disabled (see
Section 6.4.2), and DOUT Type is set to Time Duration for both discrete outputs (see
Section 7.7).
6. Set Scanning
• If
Scanning
• If
Scanning
consumed by the PID control function.
7. Set
Mode
• If
Mode
according to the value configured for the
Point
• If
Mode
adjustment.
Configuration and Use Manual
:
– Only a primary control loop will be configured and used.
– Both a primary control loop and an override control loop will be
as required:
: a single analog output will be used for loop control. Ensure that AO Assignment
: two discrete outputs will be used for loop control. Ensure that two discrete
as required.
is enabled, the PID control loop functions as configured.
is disabled, all PID control functions are halted. No processor resources are
as required.
is set to , the PID algorithm is not executed. Outputs are adjusted
Manual
and (discrete control). See Step 10.
DO Close Point
is set to the PID algorithm is executed and used as the basis for output
Auto,
Control Type = Override Control
(analog control) or
Output Point DO Open
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