YOKOGAWA UT55A - Chapter 8: Control Functions; 8.1 Setting Control Mode (CTLM)

8-1
IM 05P01C31-01EN
Control Functions
8
8.1 SettingControlMode(CTLM)
8.1.1 Single-loop Control, Single-loop Heating/cooling Control, Single-loop
PositionProportionalControl,andSingle-loopTwo-positionTwo-level
Control
Setting Details
Parameter
symbol
Name Displaylevel Setting range Menusymbol
CTLM Control mode STD
SGL: Single-loop control
CAS1: Cascade primary-loop
control
CAS2: Cascade secondary-loop
control
CAS: Cascade control
BUM: Loop control for backup
PVSW:Loop
controlwithPV
switching
PVSEL:LoopcontrolwithPVauto-
selector
PVHD:LoopcontrolwithPV-hold
function
CTL
 CAUTION
• Someparameterswillbeinitializedifthecontrolmode(CTLM)ischanged.
• When using the ladder program, the control mode cannot be changed.
Description
These control modes provide the basic control function having one control computation
unit.
Single-loop control can be used for Standard type or Heating/cooling type controller.
Single-loop heating/cooling control can be used for Heating/cooling type controller.
Single-loop position proportional control can be used for Position proportional type
controller.
Single-loop two-position two-level control can be used for Heating/cooling type controller.
► PIDcontrol,Heating/coolingcontrol,andTwo-positiontwo-levelcontrol:8.2SettingControl
Type (CNT)
Uptofour10-segmentlinearizerapproximation/10-segmentlinearizerbiasescanbe
used for the input unit or output unit.
The Function block diagram describes only the basic functions.
Parameter symbols in the Function block diagram describe representative parameters.
For the functions and parameters which are not described in Function block diagram, see
the following.
► Contactinputassignment:12.1SettingContactInputFunction
► Contactoutputassignment:12.2SettingContactOutputFunction
► Contactoutputassignmenttoretransmissionoutputterminal:10.1SettingControlOutputType
► Analogoutputrangechange:10.14ChangingCurrentOutputRange
Chapter8ControlFunctions