
82 UDC 6300 Process Controller Product Manual 1/03
4.6 Algorithm Data Set Up Group
Introduction
This data deals with various algorithms in the controller:
• Control algorithm,
• Input Math algorithms,
• Selecting the Number of PID Loops, and
• Output Override.
Algorithm group
prompts
Table 4-5 lists all the function prompts in the Algorithm setup group and
their definitions.
Table 4-5 Algorithm Group Definitions
Lower Display
Prompt
Upper Display
Range of Setting
or Selection
Parameter
Definition
LOOP RATE Loop 1 Loop 2
1 12X
1 9X 2 3X
1 6X 2 3X
1 3X 2 3X
The LOOP RATE is the Loop sampling rate per second
for inputs 1 through 4 and is selectable from 3 to 12
conversions per second for each loop (1 or 2). A faster
sampling rate reduces the number of inputs that can be
used.
Input 5 cannot be used for Loop 1 selections faster than
3X, nor for either Loop when using the
1 9X 3X selection.
The table below shows the available selections.
Loop Maximum
Rate Loop 1 Loop 2 Number of
Selection High Level
Inputs
1 12X 12X N/A 1
1 9X 3X 9X 3X 2
1 6X 2 3X 6X 3X 3
1 3X 2 3X 3X 3X 4
CONT ALG
The CONTROL ALGORITHM lets you select the type of
control that is best for your process.
ON-OFF
ON/OFF is the simplest control type. The output can be
either ON (100%) or OFF (0%). The Process Variable
(PV) is compared with the setpoint (SP) to determine the
sign of the error (ERROR = PV-SP). The ON/OFF
algorithm operates on the sign of the error signal.
In Direct Acting Control, when the error signal is positive,
the output is 100%; and when the error signal is negative,
the output is 0%. If the control action is reverse, the
opposite is true. An adjustable overlap (Hysteresis Band)
is provided between the on and off states.
Other prompts affected: “OUT HYST”
Continued next page
Table 4-5 continued on next page
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