YOKOGAWA UTAdvanced UT55A, User Manual

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1-5
IM 05P01C31-01EN
Introduction to Functions
1
1.3 Control Functions
Control mode schematic diagram Description
Cascade control
PV1
OUT
PV2 (RSP)
PID1
PID2
“Cascade control” uses two control computation
units and permits Cascade control using just a
single controller.
Remote input (RSP) terminal is required for
Loop-2 PV input.
► 8.1.4 Cascade Control, Cascade Heating/
cooling Control, and Cascade Position
Proportional Control
Loop control
for backup
PV
OUT from host
(RSP)
OUT
DI
PID
“Loop control for backup” allows control in
connection with host control equipment (such as
another controller or programmable controller
(PLC)). If the host control equipment breaks down
and the controller receives the FIAL signal, the
controller performs backup control operations.
Remote input (RSP) terminal is required for output
tracking input.
► 8.1.5 Loop Control for Backup, Heating/
cooling Loop Control for Backup, and Position
Proportional Loop Control for Backup
Loop control
with
PV switching
PV1 PV2 (RSP)
OUT
DI
PID
“Loop control with PV switching” uses two PV
inputs, which are switched according to input
contact signals or measurement ranges.
Remote input (RSP) terminal is required for
Loop-2 PV input.
► 8.1.6 Loop Control with PV Switching,
Heating/cooling Loop Control with PV
Switching, and Position Proportional Loop
Control with PV Switching
Loop control
with
PV auto-selector
PV1
PV2
(RSP)
PV3
(AIN2)
PV4
(AIN4)
OUT
PID
SELECT
“Loop control with PV auto-selector” automatically
selects or calculates the max. value, the min.
value, the average, or difference (of PV1 and PV2)
of two to four PV inputs.
Remote input (RSP) terminal and auxiliary analog
input terminal are required for the inputs 2, 3, and 4.
► 8.1.7 Loop Control with PV Auto-selector,
Heating/cooling Loop Control with PV Auto-
selector, and Position Proportional Loop
Control with PV Auto-selector
Loop control
with
PV-hold function
PV
OUT
DI
PID
HOLD
“Loop control with PV-hold function” holds the PV
input value and control output value according to
the input contact signals.
► 8.1.8 Loop Control with PV-hold Function,
Heating/cooling Loop Control with PV-hold
Function, and Position Proportional Loop
Control with PV-hold Function