
176 UDC 6300 Process Controller Product Manual 1/03
5.11 2 Loops of Control Overview, Continued
Override rules
The UDC 6300 allows you to select high or low output override. Refer to
Section 3 - Configuration to select High or Low.
The following rules apply for high/low override:
• Only one physical output is required when override is enabled. It is the
output from Loop 1 because Loop 2’s internal output is routed through the
selector.
• Loop 2 output can also be available at all times if desired.
• In Manual mode, the Output may be overridden.
Figure 5-5 is a block diagram of the HI/LO Override Selector.
Figure 5-5 Hi/Lo Override Selector
HI/LO
OVERRIDE
SELECTOR
PID
LOOP 1
PID
LOOP 2
PV 1
PV 2
OUTPUT 1
OT1 Value viewed
on front display
OUTPUT 2
OT2 Value viewed
on front display
OUTPUT 1 TERMINALS
OUTPUT 2 TERMINALS
IF DESIRED
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