Yokogawa UT55A, UT52A Specifications

General

Specications

UT55A, UT52A
Digital Indicating Controller

(Panel Mounting Type)

GS 05P01C31-01EN

n Overview

The UT55A and UT52A digital indicating control­lers employ an easy-to-read, 14-segment large color
LCD display, along with navigation keys, thus greatly
increasing the monitoring and operating capabilities.
A ladder sequence function is included as standard.
The short depth of the controller helps save instrument
panel space. The UT55A and UT52A also support
open networks such as Ethernet communication.

The UT55A and UT52A have a DIN rail mounting type
(with option code /MDL). For more details, please see

General Specication GS 05P01C81-01EN.

n Features

• A 14-segment, active (PV display color changing
function) color LCD display is employed.

Two ve-digit, high-resolution displays are possible.
Alphabet letters can be displayed in an easy-to-read

manner. The guide display shows parameter names.

• Easy to operate
Navigation keys (SET/ENTER and Up/Down/Left/
Right arrow keys) are employed to facilitate making
settings.

• 65 mm depth

The small depth enables the mounting in a thin and

small instrumented panel.

• Ladder sequence function is included as standard.
This function allows for creating a simple sequence
control. Dedicated LL50A Parameter Setting Software
(sold separatly) allows for performing programming
using a ladder language.

• Various built-in open network functions such as Eth­ernet are available.
Easy connection with various vendors’ PLCs is possible.

(UT52A support CC-Link and RS485 communication only.)

• Quick setting function
Setting only the minimum necessary parameters for
operation is possible. (For single-loop control only)

• Equipped with a multitude of functions
Universal I/O, eight control modes (cascade con­trol, etc), and retransmission output are included as
standard. PID control, heating/cooling control, feed

forward control, etc. are available.

• LL50A Parameter Setting Software (sold separately)
The parameters and ladder programs of UTAdvanced

digital indicating controller can be built from a PC using

this software. It makes data management even easier.

• Dust-proof and drip-proof

IP66 (for front panel) (Not applicable to side-by-side

close mounting.)

NEMA4 (Hose-down test only)

nFunctionalSpecications

ControlSpecications

(1) Control Mode

Control functions of the controller can be set as control

modes.

Functional

Enhancement

UT55A UT52A

Control mode Function

SGL (1)
CAS1 (2)
CAS2 (3)

CAS (4)

BUM (5)

PVSW (6)

PVSEL (7)

PVHD (8)

*1: Remote auxiliary analog input is required.

Single-loop control
Cascade primary-loop control
Cascade secondary-loop control
Cascade control

Loop control for backup

Loop control with PV switching
Loop control with PV auto-selector (Max./Min./Ave./Diff.)
Control with PV-hold function

(*1)

(*1)

(*1)

(*1)

(*1)

2) Control period

Selectable from 50 ms

*2: Cascade control (Control mode 4) cannot be used.
“Super” function or “Super 2” function cannot be used.

(*2)

, 100 ms, and 200 ms

Table of Number of Inputs and Outputs

Model and

sufxcode

(See the

model code)

UT55A

UT52A

*3: Excluding control output

*4: The numbers in parentheses show the numbers

*5: Excluding control output relays

Number

of analog

input

points

-×0×

-×1× 2 1 9 (8) 8

-×2× 2 1 4 (3) 3

-×3× 1 1 8 8

-×4× 2 1 4 (3) 3

-×5× 2 1 9 (8) 8

-×6× 1 1 8 18

-×7× 4 1 6 (5) 3

-×0× 1 1 3 3

-×1× 2 1 3 3

-×2× 2 1 4 (3) 3

-×3× 1 1 5 5

of points in each model with RSP direct input.(/DR
option.

1 1 3 3

Number

of analog

output

(*3)

points

Number

of contact

input

(*4)

points

Number of

contact

points

(*1)

output

(*5)

Yokogawa Electric Corporation
2-9-32, Nakacho, Musashino-shi, Tokyo, 180-8750 Japan
Tel.: [phone] Fax.: [phone]

GS 05P01C31-01EN

1st Edition Jan. 16, 2009 (KP)

9th Edition Mar.14, 2016 (YK)

2

ControlComputationSpecications

(1)

Combination of types of control and control modes

Types of control

PID control √ √

ON/OFF control

Two-position, two-

level control

Heating and cooling

control

(*7)

1 2 3 4 5 6 7 8

(*6)

√
√

(*7)

√

Sample PI control √
Batch PID control √

Feedforward control √

√: Available N/A: Not Available
*6: Not selectable for Position proportional type
*7: Selectable for heating and cooling control

(2) Control Computation Function

(a) Target setting point and the number of PID param-

eter groups

Respectively, eight sets of target setpoints, alarm set-

points, and PID parameters can be set. For cascade
control, respectively, eight sets can be set for main

(primary side) and slave (secondary side).

(b) Selecting the PID parameter group

The following PID parameter groups can be selected.

• Target setpoint number (SPNO) (The PID number
can be set arbitrarily.)

• Measured input zone PID

• Target setpoint zone PID

• Reached target setpoint zone PID

(c) Auto-tuning

• Tuning results can be selected from two options,
Normal or Stable.

• Tuning output limit can be set. (It cannot be used in

heating/cooling control.)

(d) “Super” function: Overshoot-suppressing function
(e) “Super 2” function: Hunting-suppressing function
(f) STOP preset output function
(g) Input ERROR preset output function
(h) MANUAL preset output function

(3) Operation Mode Switching

Operation mode

switching

AUTO/MANUAL and RUN/STOP switching
CASCADE/AUTO/MANUAL switching
REMOTE/LOCAL switching

(4) Control Parameter Setting Range

Proportional band 0.1 to 999.9%

Integral time 1 to 6000 sec. or OFF (using manual reset)

Derivative time 1 to 6000 sec. or OFF

ON/OFF control

hysteresis (one or two

hysteresis points)

Preset output

value

High/low output

limiter

Tight shut

function

Rate-of-change

limiter of output

Output

deadband

0.0 to 100.0% of measured input range width

-5.0 to 105.0% (however, 0 mA or less cannot

be output)

-5.0 to 105.0%
Low limit setpoint < high limit setpoint

When manual control is carried out with 4 to

20 mA output, control output can be reduced to
about 0 mA.

0.1 to 100.0%/sec., OFF

For heating and cooling control: -100.0 to 50.0%
For position proportional control: 1.0 to 10.0%

Control mode

(*6)

√ √ √ √ √ √

N/A N/A N/A N/A

N/A N/A N/A N/A N/A N/A N/A

N/A

√ √ √ √ √ √

N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A

√ √

√ √ √
√ √ √

N/A

√

Alarm Functions

• Types of Alarm

PV (measured value) high/low limit alarm

Measured value

alarm

Deviation alarm

Rate-of-change

alarm

Setpoint alarm

Output alarm

Other alarms

Deviation high/low limit alarm
Deviation high and low limits alarm
Deviation within high and low limits alarm
Analog input PV high/low limit alarm
Analog input RSP (ROMOTE) SP high/low limit alarm
Auxiliary analog input high/low limit alarm

Feedback input high/low limit alarm

PV rate-of-change alarm
SP (setpoint) high/low limit alarm
Target SP high/low limit alarm
Target SP deviation high/low limit alarm
Target SP deviation high and low limits alarm
Target SP deviation within high and low limits alarm
Control output high/low limit alarm
Cooling control output high/low limit alarm
Heater disconnection alarm (for /HA option)
Self-diagnosis alarm
FAIL

• Alarm Functions

Alarm output

action

Number of alarm

settings

Number of alarm

output points

Alarm stand-by action

Alarm latch (forced reset) function
Alarm hysteresis
Alarm ON/OFF delay timer

8 (per loop)

Up to 18 (differs by model code)

Contact I/O Function

This function allows for allocating the input error
condition, operation condition, alarm condition or other
conditions to the contact input and contact output.

AUTO/MANUAL switching
REMOTE/LOCAL switching
STOP/START switching
Switching to CASCADE
Switching to AUTO
Switching to MANUAL
Switching to REMOTE

Contact input

Contact output

Switching to LOCAL
AUTO-TUNING START/STOP switching
OUTPUT TRACKING switching
Two-input switching
PV Hold

LCD backlight ON/OFF switching

Message interrupt displays 1 through 4

SP number specication
PID number specication
Manual preset output number specication

Loop 1 alarms 1 through 8
Loop 2 alarms 1 through 8 (for cascade control)
Status output

Ladder Sequence Function

(1) Number of I/O Points

UT55A UT52A

Number of digital input points Up to 9 Up to 5

Number of digital output points Up to 18 Up to 5

This is limited by the number of contact I/O signal

points. (See the model code.)

(5) Ladder computation period

Ladder computation period is the same as control period.

All Rights Reserved. Copyright © 2009, Yokogawa Electric Corporation

GS 05P01C31-01EN

Mar.14, 2016-00

3

(2) Types of Command

Number of

Number of basic
command types

Number of applica­tion command types

commands

13

73

Remark

Load, AND, OR, Timer,
Counter, etc.

Comparison, reverse, addition/

subtraction/multiplication/

division, logic operation, high/
low limiter, etc.

(4) Program capacity

Max. Program capacity: 500 steps *

*: Available number of steps differs according to the

parameters, using command and control period.

(5) Ladder computation period

Ladder computation period is the same as control
period.

(3) Sequence Device

Types of device Number of points

Digital I/O

Internal device

Special device Special relay (bit data) 12

Input relay 9 (max)
Output relay 18 (max)
M relay (bit data) 256
DAT register (data) 28
P register (parameter) 10
K register (constant) 30

* Process data and process relay can be used besides

the above-mentioned.

Communication Function

Function Method Interface Targets Maxconnection

Server Ethernet PLC and others 2 connections

Modbus/TCP

A standard industry protocol
allowing communications

Gateway

Ethernet

+RS-485

between the controller and

Modbus
(RTU/ASCII)

PROFIBUS­DP

CC-Link

devices such as PCs, PLCs,
and DCSs.

Used for communication

between PLCs and
remote I/O, enabling high-

speed data transmission.

Slave RS-485

Slave RS-485 PLC and others

Modbus master

function

RS-485

Slave RS-485 PLC and others

Modbus master

function

RS-485

Slave RS-485 PLC and others

DeviceNet

Modbus master

function

RS-485

A protocol allowing multiple

Peer to peer

controllers to send and

receive data between

one another. The Ladder

Multi-drop

RS-485

(2 wire

only)

Program is used.

Coordinated
Communica­tion

A protocol to coordinate the
operation of two or more
instruments controlling the
same process.

Master/Slave RS-485

The proprietary Yokogawa

PC link

Ladder

protocol allowing
communications to PCs,
PLCs and touch panels.
A protocol to communicate
to PLCs.

Slave RS-485

*1: UT digital indicating controller, Signal conditioner JUXTA, Power monitor POWERCERT can be connected.
*2: UT digital indication controllers can be connected.

RS-485: UT75A, UT55A,

UT52A, UT35A, UT32A,

UP55A,UP35A,UM33A

(*1)

PLC and others,
UT75A, UT55A, UT52A,
UT35A, UT32A, UP55A,

UP35A, UP32A, UM33A

UT75A, UT55A,
UT52A, UT35A,

UT32A, UP55A, UP35A

UT75A, UT55A, UT52A,
UT35A, UT32A, UP55A,
UP35A, UP32A, UM33A

UT75A, UT55A,
UT52A, UT35A,

UT32A, UP55A, UP35A

UT75A, UT55A, UT52A,
UT35A, UT32A, UP55A,

UP35A, UP32A

UT75A, UT55A, UT52A,
UT35A, UT32A, UP55A,

UP35A, UP32A

(*2)

PC and others,
UT75A, UT55A, UT52A,
UT35A, UT32A, UP55A,

UP35A, UP32A, UM33A

(*2)

Number of nodes:

(Main Controller

is included.)

Number of nodes:

42 (Remote device)

(Main Controller

is included.)

Number of nodes:

(Main Controller

is included.)

Read/Write: 4

Read only : 28

Master : 1 unit

Slave : 31 units

(*2)

31 units

31 units

126

31 Units

31 Units

64

31 Units

units

units

31units

Communication

Data

PV, SP, OUT,

ALM etc

All Rights Reserved. Copyright © 2009, Yokogawa Electric Corporation

GS 05P01C31-01EN

Mar.14, 2016-00

Physical Interface

Ethernet

Standard : IEEE802.3 (10BASE-T, 100BASE-TX)

Max segment length : 100m

Max. Connecting Congguration : Cascade Max. 4 level (10BASE-T), Max. 2 level (100BASE-TX)

RS-485 Standard : EIA RS-485
Communication method : Two-wire harf-duplex or four-wire harf-duplex, start-stop synchoronization

Baud rate : 600, 1200, 2400, 4800, 9600, 19200 or 38400bps

and non-procedural

(*3)

, Peer to peer communication is xed at

19200bps

Maximum communication distance : 1200m

Terminating resistor : 220Ω (External)

*3: “38400 bps” is available only for UT55A (Type 3 code = 1) and UT52A (Type 2 code = 1)

PROFIBUS-DP Standard : Field bus (IEC61158)

Corresponding version : DP V0
Baud rate : 9.6k

,

19.2k, 45.45k, 93.75k, 187.5k, 0.5M, 1.5M, 3M, 6M, 12M

, AUTO

(*4)

Communication distance : 1200m (9.6k to 93.75k) 1000m (187.5k)

400m (0.5M) 200m (1.5M)

100m (3M to 12M)

*4: AUTO automatically sets the baud rate to that of the host controller (PROFIBUS-DP master).

CC-Link Supported version : Remote device (Ver.1.10, Ver.2.00)

Baud rate : 156k, 625k, 2.5M, 5M, 10M bps
Transmission distance : 1.2km (156k bps), 600m (625k bps), 200m (2.5M bps), 150m (5M bps),

100m (10M bps)

When using optical repeater : 7.6 km (156k) to 4.3 km (10M)

DeviceNet Field bus (IEC61158)
Baud rate: 125k, 250k, 500k bps
Transmission distance: 500m (125k bps), 250m (250k bps), 100m (500k bps)

4

All Rights Reserved. Copyright © 2009, Yokogawa Electric Corporation

GS 05P01C31-01EN

Mar.14, 2016-00

5

nHardwareSpecications

DisplaySpecications

• PV display
5-digit, 14-segment active color LCD (white/red)

Character height: 21.5 mm for UT55A and 13.0 mm
for UT52A

• Data display
5-digit, 11-segment color LCD (orange)

• Bar graph display
12-segment color LCD (orange and white)

UniversalInputSpecications

• Number of input points: 1

• Types of input, instrument range, and measurement

accuracy (see the table below)

Types of input

-270.0 to 1370.0°C -450.0 to 2500.0°F ±0.1% of instrument

K

-270.0 to 1000.0°C -450.0 to 2300.0°F

-200.0 to 500.0°C -200.0 to 1000.0°F

J -200.0 to 1200.0°C -300.0 to 2300.0°F

-270.0 to 400.0°C -450.0 to 750.0°F

T

0.0 to 400.0°C -200.0 to 750.0°F

B 0.0 to 1800.0°C 32 to 3300°F

S 0.0 to 1700.0°C 32 to 3100°F
R 0.0 to 1700.0°C 32 to 3100°F

N -200.0 to 1300.0°C -300.0 to 2400.0°F

E -270.0 to 1000.0°C -450.0 to 1800.0°F ±0.1% of instrument

Thermocouple

L -200.0 to 900.0°C -300.0 to 1600.0°F

-200.0 to 400.0°C -300.0 to 750.0°F

U

0.0 to 400.0°C -200.0 to 1000.0°F

(*2)

0.0 to 2300.0°C 32 to 4200°F

W

Platinel

0.0 to 1390.0°C 32.0 to 2500.0°F

2

PR20-40 0.0 to 1900.0°C 32 to 3400°F

W97

0.0 to 2000.0°C 32 to 3600°F

Re3-W75

Re25

-200.0 to 500.0°C -300.0 to 1000.0°F

JPt100

-150.00 to 150.00°C -200.0 to 300.0°F

-200.0 to 850.0°C -300.0 to 1560.0°F

(RTD) 3-wire

Resistance-temperature

detector

Standard

signal

DC voltage

DC current 0.00 to 20.00 mA -

All Rights Reserved. Copyright © 2009, Yokogawa Electric Corporation

-200.0 to 500.0°C -300.0 to 1000.0°F

Pt100

-150.00 to 150.00°C -200.0 to 300.0°F

0.400 to 2.0000 V -

1.000 to 5.000 V -

4.00 to 20.00 mA -

0.000 to 2.000 V -

0.00 to 10.00 V -

-10.00 to 20.00 mV -

Instrument range

°C °F

Accuracy

range ±1 digit for 0°C
or more
±0.2% of instrument
range ±1 digit for less
than 0°C
However, ±2% of
instrument range
±1 digit for less than

-200°C of thermocouple
K ±1% of instrument
range ±1 digit for less
than -200°C of thermo­couple T
±0.15% of instrument
range ±1 digit for 400°C
or more
±5% of instrument
range ±1 digit for less
than 400°C
±0.15% of instrument
range ±1 digit
±0.1% of instrument
range ±1 digit
±0.25% of instrument
range ±1 digit for less
than 0°C

range ±1 digit for 0°C
or more
±0.2% of instrument
range ±1 digit for less
than 0°C
However, ±1.5% of
instrument range ±1 digit
for less than -200.0°C of
thermocouple E
±0.2% of instrument
range ±1 digit
±0.1% of instrument
range ±1 digit
±0.5% of instrument
range ±1 digit for 800°C
or more
Accuracy not guaran­teed for less than 800°C

±0.2% of instrument
range ±1 digit

±0.1%

of instrument
range ±1 digit
±0.1% of instrument
range ±1 digit
±0.1%
range ±1 digit

±0.1% of instrument
range ±1 digit

±0.1% of instrument
range ±1 digit

(*1)

of instrument

(*1)

The accuracy is that in the standard operating condi­tions: 23 ±2°C, 55 ±10%RH, and power frequency at
50/60 Hz.

*1:

±0.3°C and ±1 digit in the range between 0 and 100°C
±0.5°C ±1 digit in the range between -100 and 200°C

*2:

W-5% Re/W-26% Re (Hoskins Mfg.Co.), ASTM E988

•

Applicable standards: JIS, IEC and DIN (ITS-90) for ther­mocouples and resistance-temperature detectors (RTD)

• Input sampling period: Synchronized to control period

• Burnout detection
Upscale and downscale of function, and OFF can
be specied for the standard signal of thermocou­ple and resistance-temperature detector (RTD).
For integrated signal input, 0.1 V or 0.4 mA or less

is judged as a burnout.

• Input bias current: 0.05 μA (for thermocouple and

resistance-temperature detector (RTD))

• Resistance-temperature detector (RTD) measured

current: About 0.16 mA

• Input resistance

1 MΩ or more for thermocouple/mV input
About 1 MΩ for voltage input

About 250 Ω for current input (with built-in shunt

resistance)

• Allowable signal source resistance

250 Ω or less for thermocouple/mV input

Effect of signal source resistance: 0.1 μV/Ω or less
2 kΩ or less for DC voltage input
Effect of signal source resistance: about

0.01%/100 Ω

• Allowable wiring resistance
Up to 150 Ω per line for resistance-temperature

detector (RTD) input (conductor resistance

between the three lines shall be equal)

Effect of wiring resistance: ±0.1°C/10 Ω

• Allowable input voltage/current

±10 V DC for thermocouple/mV/mA or resistance­ temperature detector (RTD) input
±20 V DC for V input
±40 mA DC for mA input

• Noise reduction ratio
40 dB or more (at 50/60 Hz) in normal mode
120 dB or more (at 50/60 Hz) in common mode

• Reference junction compensation error
±1.0°C (15 to 35°C)
±1.5°C (-10 to 5°C and 35 to 50°C)

AuxiliaryAnalogInputSpecications

• This function can be used for remote setpoint setting,

external compensating input, auxiliary input for com­putation, etc.

• Number of input points: see the model code table.

• For types of input, instrument range, and measure-

ment accuracy, see the table below.

Types of input Instrument range Accuracy

Integrated signal

DC voltage

DC voltage with High input

impedance

0.400 to 2.000 V

1.000 to 5.000 V

0.000 to 2.000 V

0.00 to 10.00 V

0.000 to 1.250 V

• Input sampling period: Synchronized to control period

• Input resistance: about 1 MΩ
However, 10 MΩ or more for high input impedance

• Burnout detection: Functions at standard signal
Burnout is determined to have occurred if it is

0.1 V or less.

GS 05P01C31-01EN

±0.2% of instrument range
±1 digit

±0.1% of instrument range
±1 digit

±0.2% of instrument range
±1 digit

±0.1% of instrument range
±1 digit

±0.1% of instrument range
±1 digit

Mar.14, 2016-00