UP55A {1/4 DIN}
Advanced Programmable Controllers with Alarms

Designed for demanding applications
(Rugged, reliable, high accuracy, feature loaded)


  • Up to 30 program patterns
  • 8 PV events, 16 time events, and 8 alarms can be monitored simultaneously
  • Up to 9 DIs and 18 DOs (combinations available)
  • Display:
    • A 14-segment, active (PV display color changing function) color LCD display is employed.
    • Two five-digit, high-resolution displays
    • Ladder Sequence Control
    • Fuzzy Logic Control
  • Control:
    • — 8 Built-in Control Modes
    • — 8 Built-in Control Types
    • 5 built-in control functions and algorithms
    • Ladder Sequence Control
    • Fuzzy Logic Control
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  • Simple operation:
    • Auto-tunning
    • Scrolling Text
    • Navigation Guide & Navigation Keys
    • Programmable Function Keys
    • User Settable Default Values
    • Compact Design
  • Communications
    • Modbus, Peer to peer
    • PC-Link & Ladder protocols and coordinated operation
    • Ethernet, RS-485, PROFIBUS-DP, CC-Link


  • Measurement, display, and control of temperature, pressure, and flow rate
  • Research and development facilities and manufacturing operations
    (heat treatment, washing, sterilizing, etc.)
  • Critical heating and cooling control


The UP55A program controller employs an easy-to-read, 14-segment large color LCD display, along with navigation keys, greatly increasing the monitoring and operating capabilities. A ladder sequence function is included as standard.

The UP55A is a versatile and well equipped controller with a convenient fast-forwarding of program operation, used to check the program pattern settings and the program pattern-2 retransmission serves as a program pattern generator. The ladder sequence control function can replace a PLC required by the application. The Sequence control and PID control can be performed simultaneously in monitoring and controlling external machinery such as Lamps, switches, timers and easily solve digital input / output logic functionality.

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It is quick and easy to assign frequently used functions, such as the operation mode switch, Run/Stop, program pattern selection, Remote/Local, alarm latch release, and PID parameter display. This full featured, reliable program controller is ideal for the most demanding applications, all you need in a small package.

UTAdvanced digital indicating controllers come standard with a sequence control function based on the ladder logic programming language, which is widely used by engineers. This product series improves design efficiency and reduces costs by eliminating the need for relays and other types of peripheral devices.

  • Literature
  • Specifications
  • Accessories
Model: Yokogawa UP55A advanced Programmable controllers
PV/SP Data display: 5 digits / 5 digits with LCD display
PV inputs: 2 universal inputs (TCs, RTDs, mV, V)
Auxiliary Analog Input: 1 for secondary PV
Control scan period: 100, 200, 500ms
Control loops: 1 or 2(cascade, dual)
Program Pattern: 30
Number of Patterns: 300
Number of Segments/ Pattern: 99
Number of (PV) Events/Segment: 8
Number of Time Events/Segment: 16
Number PID Sets: 8
Current trans input (option): 2
Ladder Sequence Function (Number of max. steps) 500
Control Algorithms: ON/OFF, 3 position, PID(Continuous,Time-proportional), Heating & Cooling
Control Computation: Continuous PID control, Time-proportional PID control, Relay ON/OFF control, Heating/Cooling control, Target setpoint , PID parameter, Auto-tuning, "SUPER" function, "SUPER2" function, Preset output function and Control cycle time
Operation Mode switching: Start of program operation (PROG)
Stop of program operation (RESET)
Start of local-mode operation (LOCAL)
Start of remote-mode operation (REM)
Pause/cancel release of program operation (HOLD)
Advance of segment (ADV)
Automatic (AUTO)/Manual (MAN) switching
Local (LSP)/CAS switching when in cascade control
Parameters: Segment PID
(Measured input zone, PID, Target setpoint zone, PID, Reached target setpoint zone, PID Local, PID Reference deviation) Proportional band, Integral time, Derivative time, ON/OFF control hysteresis
(one or two hysteresis points), Preset output value, Output limiter, Rate of change limiter of output, Dead band of heating/cooling control, Dead band of position-proportional control, Shutdown function
Analog Inputs
Standard (Max.) 1(Std) 4(Max)
Analog Outputs
Standard (Max.) 2(Std) 3(Max)
Auxiliary Analog Output
1 point, 2 points when MV is relay output (4-20mA)
Digital Outputs
Control Outputs (MV) Select from 2 sets of Relays, Voltage Pulses or 4 to 20mA
Standard (Max.) 8(Std) 18(Max)
Digital Inputs
Number: 8(Std) 9(Max)
Current Transformer Inputs
Number: 1
Remote inputs
Standard (Max.) 2(Std) 3(Max)
Auxiliary Analog Output
1 point, 2 points when MV is relay output (4-20mA)
Number: 1 or 3
Type: PV, SP, OUT, etc
Remote Input
Number: 1 point
Type: 1 to 5 V, etc
Only 1 input can be changed to universal input when specified the /DR option
Loop power supply
Number: 1 point
Type: 21.6 to 28.0 VDC
Number: 1
Type: RS-485, Ethernet, PROFIBUS-DP, CC-Link, DeviceNet
Front Protection: IP55
Power supply: Rated voltage 100 to 240V AC, (±10%), 50/60Hz
Power consumption: Max 20 VA
General Approvals UL, CE, CSA
Power Supply Consumption: 90 to 264 V AC, max. 20VA
Operating Temperature: 0 to 50°C ( 40°C or less in close mounting side-by-side)
Relative Humidity: 20 to 90% (non condensing)
Storage Temperature: -25 to 70°C
Dimensions: 96W×96H×100D (From the front panel surface) (mm)
Mounting: Direct panel mounting; mounting bracket, one each for upper and lower mounting
Weight: 0.5 kg

PC-based Setup Parameters & Custom Computation Building Tools

For UTAdvanced Series Controllers
LL50A Parameter Setting Software

The LL50A Parameters Setting Software is designed to build and set parameters, ladder programs, and the like of the UTAdvanced digital indicating controllers from a PC. The tuning and monitoring of ladder programs are possible during communication with the controllers.

  • Parameter Setting Function
  • Tuning Function
  • Ladder Program Building Function
  • Network Profile Creating Function
LL200 connection image

Parameter Setting Display

This function is used to set the parameters of the main unit. There are setup parameters for setting the basic functions of a main unit controller and operation parameters used for setting functions necessary to operate the main unit. It is also possible to set them using the Setting wizard.

Proper management of the setting file minimizes the downtime during maintenance and inspection.

Program pattern setting function

This function is used to set the program pattern of the UP55A/UP52A

Monitoring function

With the PC connected to one controller, the tuning function tunes PID parameters by displaying PV input values (PV), target setpoints (SP), control output values (OUT), etc. on the PC screen. Furthermore, it also enables the PV, SP, and OUT values to be displayed as trend data and acquired together with the loop information and fixed registers in the Tuning window. Acquired trend data can be saved in a file of .csv format.

Monitoring/changing registers

The register monitoring function enables the main unit’s registers to be monitored and/or changed during ladder program debugging.

Upload/download/comparison function

This function downloads parameter data, program pattern data and/or ladder program data to the main unit, uploads it from the main unit, and compares it with the main unit data. You can specify all data, or individual data items, to be uploaded or downloaded.

File management/print function

This function enables you to save created parameter data, program pattern data and/or ladder program data in a file. It also allows data to be printed out for submission to the customer.

Ladder program building function

In ladder programs, there are various computations for input and output signals, and sequence processing can be built using four fundamental arithmetic operations, logical operation, temperature compensation factor calculation, and pressure compensation factor calculation and between input and output contacts.
Configuration of ladder program
A ladder program consists of three parts: the input ladder calculation executed before control computation, and the output ladder calculation and the user ladder calculation performed after control computation. Each calculation section is respectively executed every control period.
The sequence of calculation is: input, input ladder calculation, control computation, output ladder calculation, user ladder calculation, and output.

Building a ladder program

A ladder program is built by editing the default ladder programs provided for each control mode of system data.
It is recommended that the user ladder calculation section be used if a sequence is 2 desired to be configured regardless of controller control computation. As the initial status, the default ladder programs are described in the input ladder calculation and output ladder calculation sections on a control mode basis. No program
is written in the user ladder calculation section.