Yokogawa UT550 Data sheet

<<Contents>> <<Index>>

General
Specifications

MODEL UT550
Digital Indicating Controller

GS 05D01C02-01E

■General

Model UT550 Digital Indicating Controller is an intelligent,
micro-processor based digital indicating controller with
powerful control capability and the user-friendly large
numerical display. The UT550 features as standard many
functions which are necessary for various control applica­tions, and all of these functions such as control function,
control computation function, signal computation function,
etc. can be configured by using the keys on the front panel.
The instrument has eight types of control strategies and
also an overshoot suppressing function "SUPER" and a
hunting suppressing function "SUPER 2" as well as an
auto-tuning function built in as standard. It is suitable for
a diverse range of applications, with position-proportional
control model and heating/cooling control model also
available.

■Main Features

• Extra-large digital display allows the indicated values to be
read even from a long distance. LEDs of 20 mm height are
used for the process variable display. This is a five-digit
display for higher resolution.

• Eight types of control function, including single-loop
control, cascade control, loop control with PV auto­selector, and loop control with PV-hold function, enabling
the operator to start control operation immediately after
simply entering the settings.

• Parameters can be easily set using a personal computer.
("Parameter setting tool (model LL100)" sold separately is
required.)

• Universal input and output enables users to set or change
freely the type of PV inputs, PV input range, type of
control output, etc. from the front panel.

• In addition to standard type (universal output), the
position-proportional type (relay output) or the heating/
cooling type (universal output) can be specified.

• Contact inputs (up to 8 points) and contact outputs (up to 8
points) can be employed and functions can be assigned to
each contact. (The maximum number of points varies the
suffix code.)

Note: See Hardware Specifications and Contact Outputs

• Various communication function are provided.

described later.

Communication is possible with personal computer,
programmable logic controller, and other controllers.

■Functional Specifications

● Control Functions

UT Mode

The following types of basic control structure can be set as
the UT mode by the user.

Single-loop control (UT mode 1):

The most simple and basic control function.

UT550

UT550E

“E” indicates the model
with expanded functions.

Cascade primary-loop control (UT mode 2):

Output tracking function and cascade control
logic are provided. Suitable for cascade
primary-loop control.

Cascade secondary-loop control (UT mode 3):

Setpoint output and cascade control logic are
provided. Suitable for cascade secondary-loop
control.

Cascade control (UT mode 4):

Dual control function for cascade control is
available in a single instrument.

Loop control for back-up (UT mode 5):

Output tracking function is provided to back
up another control instrument. The local and
remote control outputs are switched by a
contact input.

Loop control with PV switching (UT mode 6):

Two PV inputs are switched for control
depending on the status of contact input or PV
input.

Loop control with PV auto-selector (UT mode 7):

Two PV inputs are automatically selected for
control with a high, low, average, or tempera­ture-difference value selector.

Loop control with PV-hold function (UT mode 8):

This control holds a PV input and a control
output if an external sensor is switched.

● Control Computation Functions

In each UT mode, the following control computation
functions can be selected:

Continuous PID control, Time-proportional
PID control, Relay ON/OFF control, Position­proportional PID control (for UT550-1■,
UT550-4■)and Heating/Cooling control (for
UT550-2■).

Target setpoint and PID parameters:

Maximum eight sets of target setpoint and PID
parameters can be set. These eight sets can be
set for both the main and slave loops in
cascade control.

GS 05D01C02-01E

© Copyright Feb. 2000 (YK)

2nd Edition Sept. 2000 (MC)

<<Contents>> <<Index>>

2

Zone PID selection:

Dividing PV input range into maximum 7
zones by maximum 6 reference points, PID
parameter set switching in up to 7 PV input
zones.

Auto-tuning:

Available as standard. Possible to activate
auto-tuning for both main and slave loops for
cascade control.

"SUPER" function:

Overshoots generated by abrupt changes in the
target setpoint or by disturbances can be
suppressed.

"SUPER 2" function:

This function stabilizes the state of control
that is unstable due to hunting, etc. without
requiring any change in PID constants, when
the load and/or gain varies greatly, or when
there is a difference between the characteris­tics of temperature zones.

Preset output function:

When the instrument is in STOP mode, PV
input is burnt-out, or an abnormality is found
in an input circuit, a preset value is output as a
control output.

Sampling period

Each sampling period can be selected under
the following conditions:

50 ms: Available for model code UT550-00, when

UT mode is set to Single-loop control and
the following functions are not used:
"SUPER" function, "SUPER 2" function,
heating/cooling control, PV input computa­tion, setpoint rate-of-change limiter, MV
output rate-of-change limiter, deviation
alarm, sensor grounding alarm, fault
diagnosis alarm, and FAIL output.

100 ms: Available when UT mode is not cascade

control.
200 ms: Available when UT mode is cascade control.
(Set value when shipped from the factory: 200 ms)
500 ms: Always available.

Operation Mode Switching

(Note: Communication enables all the following

mode switching to be executed.)

AUTO/MANUAL switching:

Bumpless switching between automatic
operation mode and manual control mode is
available by using the front keys or contact
input. The contact input has priority over
front key input or switching by communica­tion. The contact input is invalid for Cascade
secondary-loop control or Cascade control.

RUN/STOP switching:

Switching by contact input (bumpless for
switching from STOP to RUN). The contact
input has priority over switching by communi­cation. In RUN mode, control computation is
activated. In STOP mode, control computa­tion ceases and a preset value is output as a
control output while other functions operate
normally.

REMOTE/LOCAL switching:

Switching between remote setpoint and local
setpoint by instrument operation or contact
input. The contact input has priority over
instrument operation or switching by
communication. For remote to local switch­ing, either bumpless tracking (employing the
remote setpoint on switching as the local
setpoint) or without tracking (directly
switching the local setpoint) can be specified.

CASCADE/AUTO/MANUAL switching:

Switching by instrument operation or contact
input. The contact input has priority over
instrument operation or switching by
communication. Valid for Cascade second­ary-loop control or Cascade control.

Output tracking ON/OFF switching:

Provided for Cascade primary-loop control or
Loop control for backup. External tracking
signal and internal control output are switched
by the contact input. The contact input has
priority over the switching by communication.

Control Parameters Setting Range

Proportional band: 0.1 to 999.9%

0.0 to 999.9% (for heating/cooling PID

control), 0.0% available for ON/OFF control
Integral time: 1 to 6,000 s, or OFF (for Manual reset)
Derivative time: 1 to 6,000 s, or OFF
ON/OFF control hysteresis: 0.0 to 100.0% of PV input

range span
Preset output: -5.0 to 105.0% (0 mA or less cannot be

output)
Output limiter:

Setting range: -5.0 to 105.0% for both high

and low limits

However, "low limit setpoint < high limit

setpoint" must be satisfied.

In case of heating/cooling PID control, upper

limiter for heating and upper limiter for

cooling.
Shutdown function:

When manual control is carried out with 4 to

20 mA output, control output can be output

down to about 0 mA (shutdown is specified

for -5.0% or less).
Rate-of-change limiter for output:

OFF or 0.1 to 100.0%/s
Deadband for heating/cooling control:

-100.0 to 50.0% for output value

Deadband for position-proportional control:

1.0 to 10.0% for output

● Configuration of Input/Output Signal

PV Input Computations

Input processing, Square root extraction (voltage input only,
Input low cut 0.0 to 5.0%), Ten-segment linearizer function,
Ten-segment bias, Bias addition (-100.0 to 100.0%), and
First order lag filter (OFF, time constant 1 to 120 s)

Auxiliary Input Computations

(Applied to remote setting input only)

Input processing, Square root extraction (Input low cut 0.0 to

5.0%), Bias addition (-100.0 to 100.0%), Ratio multiplication
(0.001 to 9.999), First order lag filter (OFF, time constant 1
to 120 s)

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation

GS 05D01C02-01E 2nd Edition Sept.18, 2000-00

<<Contents>> <<Index>>

3

● Alarm Functions

Alarm types:

PV high limit, PV low limit, Deviation high
limit, Deviation low limit, Deenergized on
deviation high limit, Deenergized on deviation
low limit, Deviation high and low limits, High
and low limits within deviation, Deenergized
on PV high limit, Deenergized on PV low
limit, SP high limit, SP low limit, Output high
limit, Output low limit.

Alarm setting range:

PV/SP alarm: -100 to 100% of PV input range
Deviation alarm: -100 to 100% of PV input
range span
Output alarm: -5.0 to 105.0% of output value
Alarm hysteresis: 0.0 to 100.0% of PV input
range span

Delay timer:

0.00 to 99.59 (minute, second)
An alarm is output when the delay timer
expires after the alarm setpoint is reached.
Setting for each alarm is possible.

Stand-by action:

Stand-by action can be set to make PV/
deviation alarm OFF during start-up or after
SP change until SP reaches the normal region.

Timer function (stabilization of control status notification

event) (Alarm 1 only):
This function sets the alarm 1 output to ON
when a preset time (timer setting) elapses after
a PV has reached the control target setpoint
hysteresis band to notify that control has
reached its stabilized status. Restarted in
RUN/STOP or SP switching.

Other alarm actions:

Sensor grounding alarm: Detects sensor
deterioration and outputs an alarm.
Fault-diagnosis alarm: For input burnout, A/D
conversion error, or thermocouple reference
junction compensation error.
FAIL output: Abnormality in software or
hardware.

Number of alarm settings: 8 (maximum)

The alarm status can be read via communica­tion in addition to output as the above alarm
output.

Alarm output points (see also the item "Contact Outputs")

• Number of contact (relay) outputs:
3 (standard) or 4 (if a control output relay is
used for the alarm 4 output relay.)

• Number of contact (transistor open collector)
outputs:
4 (when optional function code is specified
as 1 or 3)

From the above, up to 8 point outputs can be obtained
(except for cascade control).
Any of PV alarm, deviation alarm, SP alarm, output alarm,
Fault-diagnosis alarm, sensor grounding alarm and FAIL
output can be assigned to contacts for the above number of
outputs. However, the timer delay alarm can be assigned
to the alarm 1 output only. Also, the alarm 4 only can be
assigned to the control output relay (if a relay is not used
for control output).

● Display and Operation Functions

PV Display

PV is displayed in the 5-digit display. PV1 or PV2 is
displayed by switching them in cascade control. The number
of display digits is 4 or 5. For thermocouple or RTD, data
below the decimal point can be set not to display. The
display range is -19999 to 30000 and the display span is
30000 or less. [550.00 appearing in the product photograph
on page 1 cannot actually be displayed.]

Setpoint Display

A parameter name is displayed in the 3-digit display and data
in the 5-digit display. There are four kinds of displays :
operating display, operating parameter setting display, setup
parameter setting display and SELECT display.

Operating display:

Data necessary for operations, such as setpoint
or control output, are displayed depending on
the UT mode.

Operating parameters setting display:

The Operating parameters, which are mainly
changed during operations, such as PID
constant, are displayed.

Setup parameters setting display:

The Setup parameters to configure the
functions of the instrument before starting
operation are displayed.
UT mode is to be set in this display.

SELECT display:

Up to five displays which are frequently
accessed can be selected from the Operating
parameters setting display and Setup param­eters setting display to be displayed in the
SELECT display.

Status Indicator Lamps

Alarm indicator lamps:

Four lamps, AL1, AL2, AL3, and AL4

Status indicator lamps:

REM (remote operation), MAN (manual mode
operation), CAS (cascade operation), and LP2
(cascade secondary-loop control)

Deviation monitor:

▲Plus deviation, ▼Minus deviation, and
deviation in normal range

Operation Keys

䉭, 䉮 keys: Increase or decrease setpoints and other

parameters displayed in the setpoint display.

SET/ENT key: Used for setting or changing set data,

switching the displayed contents, and
switching operation modes except for A/M.

A/M key: Operation mode switching (Auto/Manual)

Security Function

Key-lock by parameter setting and prohibiting
operation by a password are available.

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation GS 05D01C02-01E 2nd Edition Sept. 18, 2000-00

<<Contents>> <<Index>>

4

Status indicator lamps

䊏

Deviation (䉱,

, 䉲)
Cascade operation (CAS) and remote operation (REM)
Manual operation (MAN)
Lit for secondary parameter indication (LP2)

Light-loader interface

Parameters are set via communication from a
personal computer.

Operation keys

Increase/decrease of the setting data (䉭, 䉮)
Screen switching/parameter selection/entry of set
data (SET/ENT)
Auto/manual operation mode switching (A/M)

● Communication Functions

(For optional function code ■1 or ■2 only)

This controller has four types of communication protocol
with one communication interface. Communication is
possible with personal computer, programmable logic
controller, and other controllers.

Communication Protocol

Computer link communication:

Communication protocol with a personal

Ladder communication:

Coordinated operation:

computer

Communication protocol with the ladder
program on some programmable logic
controllers.

Protocol for coordinated operation with more
than one GREEN SERIES controller. The
UT550 controller can be connected as a
master or slave station.

Measured value (PV) display

Displays PV and error codes when
errors are detected.

Setpoint display

Displays setpoints (SP), output
values, valve opening, or
parameters.

Alarm indicator lamps

Displays alarms (AL1, AL2, AL3,
or AL4).

MODBUS communication:

Communication protocol with a personal
computer, or PLC.

RS-485 Communication Interface

The RS-485 communication interface (conforms to EIA
RS485) can be used for personal computer link, MODBUS
communication, ladder communication, or for coordinated
operation.

Maximum number of connectable controllers:

31 GREEN SERIES controllers
Maximum communication distance: 1200 m
Communication method:

Two-wire half-duplex or four-wire half-

duplex, start-stop synchronization, and non-

procedural
Baud rate:

600, 1200, 2400, 4800, or 9600 bps

Examples of Communication System Configuration Diagram

(1) Personal computer link communication/
MODBUS communication

Personal computer

PV

PV

PV2

AL

REM
MAN1
MAN2
STP
CAS

A/M

DISP

SET/ENT

PV

PV2

PV2

AL

AL

REM

REM

MAN1

MAN1

MAN2

MAN2

STP

STP

CAS

CAS

A/M

A/M

DISP

DISP

SET/ENT

SET/ENT

UT550, UT520
Digital indicating controller

(3) Coordinated operation

PV

PV2

UP750, UP550 Program controller

AL

REM
MAN1
MAN2
STP
CAS

or

A/M

DISP

SET/ENT

UT750, UT550, UT520 Digital indicating controller

PV

PV

PV2

AL

REM
MAN1
MAN2
STP
CAS

A/M

DISP

SET/ENT

UT550, UT520
Digital indicating controller

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation

PV

PV2

PV2

AL

AL

REM

REM

MAN1

MAN1

MAN2

MAN2

STP

STP

CAS

CAS

A/M

A/M

DISP

DISP

SET/ENT

SET/ENT

PV

PV2

AL

REM
MAN1
MAN2
STP
CAS

A/M

DISP

SET/ENT

PV

PV2

AL

REM
MAN1
MAN2
STP
CAS

A/M

DISP

SET/ENT

(2) Ladder communication

MELSEC-A

Programmable logic controllor

PV

PV

PV2

PV2

AL

AL

REM

REM

MAN1

MAN1

MAN2

MAN2

STP

STP

CAS

CAS

A/M

A/M

DISP

SET/ENT

PV

PV2

AL

REM
MAN1
MAN2
STP
CAS

A/M

DISP

SET/ENT

DISP

SET/ENT

UT550, UT520
Digital indicating controller

GS 05D01C02-01E 2nd Edition Sept. 18, 2000-00

PV

PV2

AL

1

REM
MAN1
MAN2
STP
CAS

A/M

DISP

SET/ENT

<<Contents>> <<Index>>

5

■Hardware Specifications

● Input/Output Signal Specifications

PV Input Signal

Number of input points: 1
Input type, instrument input range, and measurement

Sampling period: 50, 100, 200, or 500 ms (selectable)
Burnout detection:

Input bias current: 0.05 µA (for TC or RTD b-terminal)
Measurement current(RTD): About 0.13 mA
Input resistance: 1 MΩ or more for TC or mV input

Unspecified (When shipped from the factory)
Thermocouple

RTD

Standard
signal

DC voltage

accuracy:
The type of input and instrument input range
can be specified from the instrument input
range codes shown in the table below.

Activated for thermocouple (TC) input, RTD
input, or standard signal of 0.4 to 2 V DC or 1
to 5 V DC.
Possible to specify a travel of upscale,
downscale, or off.
For standard signal input, set to burn out at

0.1 V or less.

About 1 MΩ for DC voltage input

Input Type

K

J
T

B

S
R
N

E
L (DIN)
U (DIN)

W (DIN)
Platinel 2
PR20-40

W97Re3-W75Re25
JPt100

Pt100

0.4 to 2V
1 to 5V
0 to 2V
0 to 10V

-10 to 20mV
0 to100mV

Instrument Input

Range Code

OFF

1
2
3
4
5
6

7

8
9

10

11
12
13
14
15
16

17

18
30
31
35
36
37
40
41
50
51
55
56

Set the data item PV input type “IN 1” to the OFF option to leave the PV input type undefined.

-10.00 to 20.00 mV

Instrument Input

Range (°C)

-270.0 to 1370.0°C

-270.0 to 1000.0°C

-200.0 to 500.0°C

-200.0 to 1200.0°C

-270.0 to 400.0°C

0.0 to 400.0°C

0.0 to 1800.0°C

0.0 to 1700.0°C

0.0 to 1700.0°C

-200.0 to 1300.0°C

-270.0 to 1000.0°C

-200.0 to 900.0°C

-200.0 to 400.0°C

0.0 to 400.0°C

0.0 to 2300.0°C

0.0 to 1390.0°C

0.0 to 1900.0°C

0.0 to 2000.0°C

-200.0 to 500.0°C

-150.00 to 150.00°C

-200.0 to 850.0°C

-200.0 to 500.0°C

-150.00 to 150.00°C

0.400 to 2.000 V

1.000 to 5.000 V

0.000 to 2.000 V

0.00 to 10.00 V

0.0 to 100.0 mV

Allowable signal source resistance:

250 Ω or less for TC or mV input

Signal source resistance effect

0.1 µV/Ω or less

2 kΩ or less for DC voltage input

Signal source resistance effect
About 0.01%/100 Ω
Allowable wiring resistance (for RTD input):

Maximum 150 Ω/wire (Conductor resistance

between three wires must be equal.)

However, it must be 10 Ω/wire for a

maximum range of -150.0 to 150.0°C.

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

±10 V DC for TC/mV/RTD input

±20 V DC for DC voltage input

Noise rejection ratio:

Normal mode 40 dB (50/60 Hz) or more

Common mode 120 dB (50/60 Hz) or more
Reference junction compensation error:

±1.0°C (15 to 35°C), ±1.5°C (0 to 15°C and

35 to 50°C)
Applicable standards:

JIS, IEC, and DIN (ITS-90) for TC and RTD

Instrument Input

Range (°F)

-450.0 to 2500.0°F

-450.0 to 2300.0°F

-200.0 to 1000.0°F

-300.0 to 2300.0°F

-450.0 to 750.0°F

-200.0 to 750.0°F
32 to 3300°F

32 to 3100°F
32 to 3100°F

-300.0 to 2400.0°F

-450.0 to 1800.0°F

-300.0 to 1600.0°F

-300.0 to 750.0°F

-200.0 to 1000.0°F

32 to 4200°F

32.0 to 2500.0°F
32 to 3400°F

32 to 3600°F

-300.0 to 1000.0°F

-200.0 to 300.0°F

-300.0 to 1560.0°F

-300.0 to 1000.0°F

-200.0 to 300.0°F

Display range

-19999 to 30000
Display span 30000 or
less (Decimal point
position changeable)

±0.1% ±1 digit of instrument range at 0°C or more
±0.2% ±1 digit of instrument range at less than 0°C

• However, ±2% ±1 digit of instrument range for type K
at temperatures less than -200°C.
However, ±1% ± 1 digit of instrument range for type T

•
at temperatures less than -200°C.

±0.15% ±1 digit of instrument range at 400°C or more
±5% ±1 digit of instrument range at less than 400°C

±0.15% ± 1 digit of instrument range

±0.1% ± 1 digit of instrument range
±0.25% ±1 digit of instrument range for
temperature at less than 0°C

±0.1% ±1 digit of instrument range at 0°C or more
±0.2% ±1 digit of instrument range at less than 0°C

• However, ±1.5% ±1 digit of instrument range for
type E at temperature less than -200°C.

±0.2% ±1 digit of instrument range
±0.1% ± 1 digit of instrument range

±0.5% ±1 digit of instrument range at 800°C or more

Accuracy not guaranteed for temperature less than
800°C

±0.2% ± 1 digit of instrument range
±0.1% ± 1 digit of instrument range (Note 1) (Note 2)
±0.2% ± 1 digit of instrument range (Note 1)
±0.1% ± 1 digit of instrument range (Note 1) (Note 2)

±0.2% ± 1 digit of instrument range (Note 1)
±0.1% ± 1 digit of instrument range

Note 1: The accuracy is ±0.3°C of instrument range ±1 digit for a temperature range from 0 to 100°C.
Note 2: The accuracy is ±0.5°C of instrument range ±1 digit for a temperature range from -100 to 200°C.
*1: Performance in the standard operating conditions (at 23±2°C, 55±10% RH, and 50/60Hz power frequency)

Measurement Accuracy

*1

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation GS 05D01C02-01E

2nd Edition Sept. 18, 2000-00

<<Contents>> <<Index>>

6

Auxiliary Analog Input Signal

(UT550-■1, -■2, or -■4 only)
Functions: Remote setting input, tracking input, cascade

control secondary loop PV input, etc.

Input type: Settable within the range of voltage input 0 to

2 V DC, 0 to 10 V DC, 0.4 to 2.0 V DC or

1 to 5 V DC.
Number of inputs: 1 point
Sampling period: 100, 200 or 500 ms

Auxiliary analog input sampling period is

linked with PV input sampling period.

(If PV input period is 50 ms , auxiliary analog

input period is 100 ms.)
Input resistance: Approx. 1 MΩ
Input accuracy: ±0.3% ± 1 digit of input span for 0 to 2 V

DC input

±0.2% ± 1 digit of input span for 0 to 10 V

DC input

±0.375% ± 1 digit of input span for 0.4 to 2.0

V DC range

±0.3% ± 1 digit of input span for 1 to 5 V DC

range

Performance in the standard operating

conditions (at 23±2°C, 55±10% RH, and 50/

60Hz power frequency)

Feedback Resistance Input Signal

(UT550-1■ only) Valid for position proportional PID
control.

Slidewire resistance:

Total resistance 100 Ω to 2.5 kΩ (with burnout detection of
slidewire)

Measuring resolution ±0.1% of total resistance

24 V DC Loop Power Supply for Sensor

Supplies power to the 2-wire transmitter. The current signal
is converted to a voltage signal by placing a resistor
(arbitrary from 10 to 250 Ω) and is read by the PV input
terminal.

21.6 to 28.0 V DC, maximum supply current about 30 mA
(only for models with 24 V DC loop power supply for
sensor).

■24 V DC Power Supply Wiring to Two-wire Sensor

250Ω

12

PV input

1 to 5 V DC signal

13

Loop power

43

44

supply

21.6 to

28.0 V DC

External
resistor
(Note)

Two-wire transmitter

4-20mADC

Note : Connecting a 250Ω resistor to the terminals is optional.
Model : X010-250-2 (resistor with M3.5 crimp-on terminal lugs)

Retransmission Output

Any of the PV, target setpoint or control output is output.
Or this can be used for 15 V DC loop power supply.

Number of output points: 1 or 2

Retransmission output 2 is available only when

“relay” is selected as the control output type.
Output signal: 4 to 20 mA DC, 0 to 20 mA DC, 20 to 4

mA DC or 20 to 0 mA DC (0 mA or less

cannot be output)

Load resistance: 600 Ω or less
Output accuracy: ±0.1% of span (±5% for 1 mA or less)

Performance in the standard operating
conditions (at 23±2°C, 55±10% RH, and 50/
60Hz power frequency)

When using for 15 V DC loop power supply:
Supply voltage 14.5 to 18.0 V DC, maximum supply
current about 21 mA (with the protection circuit at field
short-circuit).

Control Outputs

Select 1 or 2 points (UT550-2■) from the following output
types depending on model type and UT mode. Relay contact
output for position proportional PID control (UT550-1■
UT550-4■).

Current output

Number of output points: 1 or 2 (for heating/cooling

type) (switchable to voltage pulse output)

Output signal: 4 to 20 mA DC, 0 to 20 mA DC, 20 to 4

mA DC or 20 to 0 mA DC

Load resistance: 600 Ω or less
Output accuracy:

±0.1% of span (±5% for 1 mA or less)
Performance in the standard operating
conditions (at 23±2°C, 55±10% RH, and 50/
60Hz power frequency)

Voltage pulse output

Number of output points: 1 or 2 (for heating/cooling

control) (switchable to current output)

Output signal:

ON voltage-12 V DC or more (load
resistance 600 Ω or more)
OFF voltage- 0.1 V DC or less

Resolution: 10 ms or 0.1% of output value, whichever is

greater

Relay contact output

Number of output points: 1 or 2 (for heating/cooling

control)

Output signal: At three terminals of NC, NO, and

Common

Contact rating: 250 V AC, 3 A or 30 V DC, 3 A

(resistance load)

Resolution: 10 ms or 0.1% of output value, whichever is

greater

Contact Inputs

Usage: Target setpoint switching, C/A/M mode

switching, REMOTE/LOCAL switching,
RUN/STOP switching, or PV input switching

Number of input points:

Varies with optional codes (as shown below):

UT550-■0: 2 points
UT550-■1: 8 points
UT550-■2: 3 points
UT550-■3: 7 points
UT550-■4: 3 points

Input type: Non-voltage contact input or transistor open

collector input
Input contact rating: 12 V DC, 10 mA or more
On/off detection:

For non-voltage contact input,

On .. contact resistance 1 kΩ or less;

Off.. contact resistance 20 kΩ or more

For transistor contact input,

On .. 2 V or less;

Off.. leak current 100 µA or less
Minimum status detection hold time: PV input sampling

period ×3

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation

GS 05D01C02-01E

2nd Edition Sept. 18, 2000-00

<<Contents>> <<Index>>

7

Contact Outputs

Usage: Alarm output, FAIL output
Number of output points:

Varies with optional codes (as shown below):

UT550-■0: Relay output 3 points
UT550-■1: Relay output 3 points, transistor output 4

points

UT550-■2: Relay output 3 points
UT550-■3: Relay output 3 points, transistor output 4

points

UT550-■4: Relay output 3 points

However, when a relay is not used for
control output, the relay for control output
can be used for the alarm 4. For this reason,
the number of relay output points can be

changed to 4 by adding to the above 3.
Relay contact rating: 240 V AC, 1 A or 30 V DC, 1 A
Transistor contact rating: 24 V DC, 50 mA

● Display Specifications

Measured value (PV) display:

Data display: 3 digits + 5 digits, 7-segment red color

Status indicator lamps: LEDs

5-digit 7-segment red color LED display;
height of letters 20 mm

LED display; height of letters 9.3 mm

● Conformance to Safety and EMC Standards

Safety standard:

EMC standards:

Conforms to IEC1010-1: 1990 and EN61010­1: 1992
Certified for CSA1010
The overvoltage category of each input is
CAT II (IEC1010-1)
Certified for UL508 application

To the following EMC standards. During test,
the controller continues to operate with the
measurement accuracy within ±20% of the
range:
For EMI (emission), EN55011, Class A Group 1
For EMS (immunity), EN50082-2: 1995

● Construction, Installation, and Wiring

Construction: Dust-proof and Drip-proof front panel

Material of the body: ABS resin and polycarbonate
Case color: Black
Weight: About1 kg or less
External dimensions: 96W × 96H × 100D (from the panel

Mounting: Direct panel mounting; mounting bracket, one

Panel cutout dimensions:
Mounting attitude:

Wiring connection:

conforming to IP55.
For side-by-side close installation, the
controller loses its dust-proof and drip-proof
protection.

face) (mm)

each for upper and lower mounting

92

+0.8

0

W ×

92

+0.8

H (mm)

0

Up to 30 degrees from horizontal; Must not
face downward.

With M3.5 screw terminals (for signal, power
and grounding wiring)

● Power Supply and Isolation

Power supply: Rated voltage 100 to 240 V AC (±10%),

Power consumption: Max. 20 VA (Max. 8.0 W)
Data backup: Non-volatile memory. Service life about

Withstanding voltage:

Isolation resistance:

Grounding: Class 3 grounding (grounding resistance of

Isolation Specifications

PV input terminal:

Auxiliary analog input terminal:

15 V DC loop power supply terminal:

24 V DC loop power supply terminal:

Control output (current output or voltage pulse output) and

Relay contact control output terminals:

Contact input terminals:

Relay contact output terminals:

50/60 Hz

100,000 times of writings
1500 V AC for 1 min.

(Note)

between primary terminals and secondary
terminals

1500 V AC for 1 min.

(Note)

between primary terminals and ground
terminal

1500 V AC for 1 min.

between ground terminal and secondary
terminals

500 V AC for 1 min.

between secondary terminals

where primary terminals stand for power
and relay output terminals and secondary
terminals stand for analog input and output
signal terminals, voltage pulse output
terminals, and contact input terminals.

Note: The withstanding voltage is specified as

2300 V AC per minute to provide a margin
of safety.

20 MΩ or more for 500 V DC applied
between power terminals and ground terminal

100 Ω or less)

Isolated from other input/output terminals, but
not isolated from internal circuit.

Isolated from other input/output terminals and
internal circuit.

Not isolated from analog current output and
voltage pulse control output, but isolated from
other input/output terminals and internal
circuit.

Isolated from 4-20mA analog ouptut, other
input/output terminals and internal circuit.

retransmission output: Not isolated between
control output and retransmission output, but
isolated from other input/output terminals and
internal circuit.

Isolated between contact output terminals, and
from other input/output terminals and internal
circuit.

Not isolated between contact input terminals
and from communication terminals, but
isolated from other input/output terminals and
internal circuit.

Not isolated between relay contact outputs,
but isolated from other input/output terminals
and internal circuit.

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation GS 05D01C02-01E

2nd Edition Sept. 18, 2000-00

<<Contents>> <<Index>>

8

Transistor contact output terminals:

Not isolated between transister contact
outputs, but isolated from other input/output
terminals and internal circuit.

RS-485 communication terminals:

Not isolated from contact input terminals, but
isolated from other input/output terminals and
internal circuit.

Feedback slidewire resistance input terminals:

Not isolated from control output terminals
(current or voltage pulse output) and
retransmmision output, but isolated from other
input/output terminals and internal circuit.

Power terminals:

Isolated from other input/output terminals and
internal circuit.

Ground terminal:

Isolated from other input/output terminals and
internal circuit.

● Environmental Conditions

Normal operating conditions:

Ambient temperature: 0 to 50°C (40°C or less for side­Temperature change rate limit: 10°C/h or less

Ambient humidity: 20 to 90% RH (no condensation)
Magnetic field: 400 A/m or less
Continuous vibration (5 to 14 Hz):

Continuous vibration (14 to 150 Hz):
Short-period vibration: 14.7 m/s

Shock: 147 m/s2 or less, 11 ms
Installation altitude: 2000 m or less above sea level
Warm-up time: 30minutes or more after power on

Transportation and storage conditions:

Temperature: -25 to 70°C
Temperature change rate: 20°C/h or less
Humidity: 5 to 95% RH (no condensation)

Effects of operating conditions

Effect of ambient temperature:

Effect of power supply fluctuation (within rated voltage

by-side close mounting )

Peak-to-peak amplitude 1.2 mm or less

2

or less

4.9 m/s

2

, 15 s or less

Whichever is greater, ±1 µV/°C or ±0.01%

of F.S./°C for voltage or thermocouple

inputs.

±0.02% of F.S./°C for Auxiliary input

±0.05°C/°C (ambient temperature) or less

for RTD inputs.

±0.05% of F.S./°C or less for analog

outputs.

range):

Whichever is greater, ±1 µV/10 V or

±0.01% of F.S./10 V for analog inputs.

±0.05% of F.S./10 V or less for analog

outputs.

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation

GS 05D01C02-01E 2nd Edition Sept. 18, 2000-00

<<Contents>> <<Index>>

■Function Block Diagram for Single-loop Control
(Model UT550-0■ ,UT550-2■ or UT550-3■)

9

PV input terminals

12 1311

, and

Input selection

Unit selection

Analog input range conversion

Analog input bias

Square root extraction

Analog input filter

10-seg. linearizer approx./bias

PV input bias
PV input filter

Remote input

terminals and

Input selection

Unit selection

Analog input range conversion

Analog input bias

Square root extraction

Analog input filter

Remote setting filter

Ratio/bias calculation

2221

CommunicationAux. Input
RMS=COMRMS=RSP

REMOTE

R/L

Target setpoint ramp-rate function

Communication

terminals to

RS485

LOCAL

2723

DI3 DI4 DI5 DI6 DI1 DI2 DI8INPUT1 INPUT3

Target
setpoint
selection

SPN

Target setpoints 1 to 8

REMOTE(ON)/LOCAL(OFF) switching

Contact input

Manual operation

Preset output Output limiter

24V loop power supply

LPS

Terminals and

4443

Legend

Control computation

MAN

A/M

AUTO

AUTO(ON)/MAN(OFF) switching

RUNSTOP

S/R

OT1

Control output

OUTPUT1 OUTPUT1 OUTPUT1 OUTPUT3

Current or

pulse terminals

and

Terminal Parameter Function

Analog Signal Contact Signal Front Panel Key

STOP(ON)/RUN(OFF) switching

15V loop power supply

Relay terminals

, and

1716

2 31

RT2 RT1

Current*

terminals

and

* Unavailable when control output is current or pulse.

Retransmission output

Current

terminals

1716

and

1514

Alarm function

ON in
normal
condition

DO7DO4DO3DO2DO1

Alarm 1 Alarm 2 Alarm 3 Alarm 4 FAIL output

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation GS 05D01C02-01E

2nd Edition Sept. 18, 2000-00

<<Contents>> <<Index>>

■Function Block Diagram for Single-loop Heating/Cooling Control (Model UT550-2■)

10

PV input terminals

12 1311

, and

Input selection

Unit selection

Analog input range conversion

Analog input bias

Square root extraction

Analog input filter

10-seg. linearizer approx./bias

PV input bias
PV input filter

Remote input

terminals and

Input selection

Unit selection

Analog input range conversion

Analog input bias

Square root extraction

Analog input filter

Remote setting filter

Ratio/bias calculation

2221

CommunicationAux. Input

RMS=COMRMS=RSP

R/L

Target setpoint ramp-rate function

Communication

terminals to

RS485 DI3 DI4 DI5 DI6 DI1 DI2 DI8INPUT1 INPUT3

2723

LOCALREMOTE

REMOTE(ON)/LOCAL(OFF) switching

Contact input

Target
setpoint
selection

SPN

Target setpoints 1 to 8

Heating-side
preset output

OUTPUT1 OUTPUT1

Current or

pulse terminals

Control computationManual operation

AUTOMAN

A/M

Heating/cooling computation

Heating-side output limiter Cooling-side output limiter

OT1

Heating-side

output

Relay

terminals

and

1716

2 31

, and

* Unavailable when heating-side output is current output or pulse.

AUTO(ON)/MAN(OFF) switching

OT1

Cooling-side

output

OUTPUT2 OUTPUT2

Current or pulse

terminals

and

4746

Relay

terminals

, and

49 5048

Cooling-side
preset output

15V loop

power supply

RT2 RT1

OUTPUT1 OUTPUT3

Current*

terminals

and

1716

S/R

STOP(ON)/RUN(OFF) switching

Retransmission

output

Current

terminals

and

Alarm function

ON in
normal
condition

DO7DO4DO3DO2DO1

Alarm1Alarm2Alarm3Alarm4FAIL

output

1514

Legend

Terminal Parameter Function

Analog Signal Contact Signal Front Panel Key

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation

GS 05D01C02-01E

2nd Edition Sept. 18, 2000-00

<<Contents>> <<Index>>

■Function Block Diagram for Single-loop Position-proportional Control
(Model UT550-1■ or UT550-4■)

PV input terminals

12 1311

, and

Remote input

terminals and

2221

Communication

terminals to

RS485 DI3 DI4 DI5 DI6 DI1 DI2 DI8INPUT1 INPUT3

2723

Contact input

11

Input selection

Unit selection

Analog input range conversion

Analog input bias

Square root extraction

Analog input filter

10-seg. linearizer approx./bias

PV input bias
PV input filter

In MAN operation, relay
is ON when or
key is hold down.

Input selection

Unit selection

Analog input range conversion

Analog input bias

Square root extraction

Analog input filter

Remote setting filter

CommunicationAux. Input

RMS=RSP

Ratio/bias calculation

RMS=COM

R/L

Target setpoint ramp-rate function

Control computationManual operation

Output limiter

AUTOMAN

A/M

AUTO(ON)/MAN(OFF) switching

Target
setpoint
selection

SPN

Target setpoints 1 to 8

LOCALREMOTE

REMOTE(ON)/LOCAL(OFF) switching

Preset output

RUNSTOP

FEEDBACK

and

45

47

terminals ,

46

Feed-back input

Signal comparison

L relay

( key)

terminals ,

S/R

OUTPUT

49 50

and

M

STOP(ON)/RUN(OFF) switching

15V loop power supply

H relay

( key)

48

Relay output
Direct/reverse signal

Motor-driven valve

Retransmission output

RT2 RT1

OUTPUT1 OUTPUT3

1716

OUTPUT3

terminals

and

OUTPUT1

terminals

and

Alarm1Alarm2Alarm3Alarm4FAIL

1514

Valve position
sliding resistor

Legend

43 44

- terminals : 24VDC loop power supply

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation GS 05D01C02-01E

Terminal Parameter Function

Analog Signal Contact Signal Front Panel Key

Alarm function

ON in
normal
condition

DO7DO4DO3DO2DO1

output

2nd Edition Sept. 18, 2000-00

<<Contents>> <<Index>>

■Function Block Diagram for Cascade Control

12

Cascade primary PV

Communication

input terminals

, and

12 1311

Input selection Ratio/bias

Unit selection

Analog input range conversion

Analog input bias

Square root extraction

Analog input filter

10-seg. linearizer approx./bias

PV input bias
PV input filter

terminals

2723

to

RS485

calculation

Secondary PV
input terminals

2221

and

DI3 DI4 DI5 DI6INPUT1 INPUT3

Input selection

Unit selection

Analog input range conversion

Analog input bias

Square root extraction

Analog input filter

10-seg. linearizer approx./bias

PV input bias
PV input filter

RMS=COM

R/L

SPN

Primary target setpoint

LOCALREMOTE

Target setpoint ramp-rate function

Control computation 1

Contact inputs

Cascade

➝

ON)

(OFF

Target
setpoint
selection

If receives the FAIL signal
(burnout or A/D converter error)
from primary PV input, operation
is switched to AUTO.

SPN

Secondary target setpoint

Automatic

➝

(OFF

ON)

Manual

(OFF

DI8 DI7DI1 DI2

➝

ON)

Output limiter

Tracking in

C/A/M

AUTO or MAN

Tracking signal

Preset output

Output limiter

RUNSTOP

S/R

OT2

STOP(ON)/RUN(OFF) switching

24V loop

power supply

15V loop

power supply

Control

output

OUTPUT1 LPSOUTPUT1 OUTPUT1 OUTPUT3

Current or pulse

terminals

1716

and

Relay

terminals

2 31

, and

Terminals

4443

and

RT2 RT1

Current*1

terminals

and

*1 Unavailable when control output is current or pulse.

AUTO, MANCAS
Cascade switching

Manual operation

Retransmission

output

Current

terminals

1716

and

1514

Control computation 2

MAN

C/A/M

A/M

CAS, AUTO

MAN switching

Alarm function

DO7DO4DO3DO2DO1

Alarm 1 Alarm 2 Alarm 3 Alarm 4 FAIL output

ON in normal

condition

Legend

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation

Terminal Parameter Function

Analog Signal Contact Signal Front Panel Key

GS 05D01C02-01E

2nd Edition Sept. 18, 2000-00

<<Contents>> <<Index>>

■Function Block Diagram for Loop Control for Backup

13

PV input

Communication

terminals

12 1311

, and

Input selection

Unit selection

Analog input range conversion

Analog input bias

Square root extraction

Analog input filter

10-seg. linearizer approx./bias

PV input bias

PV input filter

Target setpoint ramp-rate function

terminals

2723

to

RS485

Ratio/bias

calculation

RMS=COM

R/L

Tracking signal

(Manipulated output from host)

terminals and

2221

DI3 DI4 DI5 DI6 DI1 DI2 DI8INPUT1 INPUT3

Input selection

Unit selection

Analog input range conversion

Analog input bias

Analog input filter

SPN

Target setpoints

1 to 8

LOCALREMOTE

Contact inputs

Target
setpoint
selection

Tracking switching signal

Manual operation

Control output
can not be
changed when
contact input 8 (DI8)
is set to ON.

Preset output

24V loop

power supply

LPS

Terminals

4443

and

Control computation

AUTOMAN

A/M

AUTO(ON)/MAN(OFF) switching

Tracking (ON)

Output limiter

RUNSTOP

S/R

OT1

OUTPUT1 OUTPUT1 OUTPUT1 OUTPUT3

Current or

pulse terminals

and

STOP(ON)/RUN(OFF) switching

Control

output

Relay

terminals

1716

2 31

, and

15V loop

power supply

RT2 RT1

Current *1

terminals

and

Retransmission

1716

*1 Unavailable when control output is current or pulse.

output

Current

terminals

and

Alarm function

ON in normal

condition

DO3DO5DO4DO2DO1

Alarm 1 Alarm 2 Alarm 4 Alarm 3 FAIL output

1514

Legend

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation GS 05D01C02-01E

Terminal Parameter Function

Analog Signal Contact Signal Front Panel Key

2nd Edition Sept. 18 2000-00

<<Contents>> <<Index>>

■Function Block Diagram for Loop Control with PV Switching

14

PV input 1

terminals

12 1311

, and

Input selection

Unit selection

Analog input range conversion

Analog input range conversion

Analog input bias

Square root extraction

Square root extraction

Analog input filter

PV input 2

terminals

22

21

and

Input selection

Unit selection

Analog input bias

Analog input filter

Communication

10-seg. linearizer approx./bias 10-seg. linearizer approx./bias
PV input Switching (Temp. range, Temp. upper limit, or DI)

Burnout occurs when
the burnout of PV
input 1 or PV input 2
occurs.

PV input bias
PV input filter

RMS=COM

R/L

Target setpoint ramp-rate function

Control computationManual operation

AUTOMAN

A/M

AUTO(ON)/MAN(OFF) switching

terminals

2723

to

RS485

Ratio/bias

calculation

DI3 DI4 DI5 DI6 DI1 DI2 DI8INPUT1 INPUT3

U1

Upper limit

U2

Lower limit

U3

Operation

SPN

Target setpoints 1 to 8

LOCALREMOTE

Contact inputs

Target
setpoint
selection

PV input
switching
(U3=2)

PV input 1(OFF)/
PV input 2(ON)

Preset output

24V loop

power supply

LPS

Terminals

4443

and

Output limiter

RUNSTOP

S/R

OT1

OUTPUT1 OUTPUT1 OUTPUT1 OUTPUT3

Current or

pulse terminals

and

STOP(ON)/RUN(OFF) switching

Control

output

Relay

terminals

1716

2 31

, and

15V loop

power supply

RT2 RT1

Current *1

terminals

and

Retransmission

1716

*1 Unavailable when control output is current or pulse.

Legend

Terminal Parameter Function

Analog Signal Contact Signal Front Panel Key

output

Current

terminals

and

Alarm function

ON in normal

condition

DO7DO4DO3DO2DO1

Alarm 1 Alarm 2 Alarm 3 Alarm 4 FAIL output

1514

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation

GS 05D01C02-01E

2nd Edition Sept. 18, 2000-00

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation GS 05D01C02-01E

1
2
3
4
5
6
7
8
9

10

41
42
43
44
45
46
47
48
49
50

31
32
33
34
35
36
37
38
39
40

21
22
23
24
25
26
27
28
29
30

11
12
13
14
15
16
17
18
19
20

8
9

Power supply

10

L

N

A

llowable range: 100-240 V AC (10%)

(free voltage)
50/60 Hz shared

Power supply

12
13

TC input

11
12

RTD input

13

12
13

mV/V input

21
22

Remote input

*

Wiring can only be carried out for

controllers with remote input.

Specify in a range of
1-5 V DC, 0-2 V DC,
or 0-10 V DC.

23
24

RS-485 communication

* Wiring can only be carried out
for controllers with communication
functions.
Maximum baud rate: 9600 bps

25
26
27

SDB(+)

SDA(-)

RDB(+)

RDA(-)

SG

*

The functionality of a contact input can be varied by changing the setting of the contact

input registration parameter.

* Factory-set to “PV retransmission.”

* Retransmission output 1 is not available if a

15 V DC loop power supply is used.

24 V DC loop

power supply

*Wiring can only be carried out for controllers with
24 V DC loop power supply.

1
2

Relay contact output

3

Control output

NC

NO

COM

Contact rating: 250 V AC, 3 A

30 V DC, 3 A (resistance load)

*Time proportional PID relay contact
output is configured at factory
before shipment.

Note: Select this option from
the OT1 parameter.

CAUTION

Before carrying out wiring, turn off the power
to the controller and check that cables to be
connected are not alive with a tester or the like
because there is a possibility of electric shock.

Installation category (overvoltage category): II (IEC1010-1)

A
b

B

NOTE

-

+

-

+

-

+

21.6-28.0VDC

(30 mA DC max.)

43
44

+

-

Default: 1-5 V DC

OT1=0 (factory-set default) OT1=1

Correspondence between parameter OT1 and control output types

OT1=2

OT1=3

* OT1 is a setup parameter.
You can change the settings of the parameter OT1 to change the control output type.

Time proportional control

Relay output

(terminals , and )

1

2

3

Time proportional control

Voltage pulse output
(terminals and )

16

17

Current output

(terminals and )

16

17

On-off control
Relay output

(terminals , and )

1

2

3

PV input

* Not configured at factory before shipment

19
18

External contact inputs

40
39
38
37

20

28
30

DI1

DI2

DI3
DI4
DI5
DI6

COM

COM

DI8

AUTO when DI1=ON
MAN when DI1=OFF

STOP when DI2=ON

RUN when DI2=OFF

DI3
DI4

1.SP2.SP 3.SP4.SP
ON

ONOFF

OFF

ON

ON OFF

OFF

5.SP6.SP7.SP8.SP
ON

ONOFF

OFF

ON

ON OFF

OFF
DI5
DI6

OFF
OFF

OFF
OFF

OFF
OFF

ON

OFF

ON

OFF

ON
OFF

ON

OFF

OFF

ON

Common

Remote when DI8=ON
Local when DI8=OFF

Common

When switching among target setpoints 1 to 8:

19
18
40
39
38
37

20

28
30

DI1
DI2
DI3
DI4

DI5
DI6

COM

COM

DI8

+5V
+5V
+5V
+5V
+5V
+5V

36

DI7

36

DI7

+5V

+5V

Contact Transistor contact

Contact rating: 12 V DC, 10 mA or more

No function

16
17

Current/voltage

pulse output

0-20mADC,
4-20mADC
Voltage pulse (12 V)

Control output

14
15

Retransmission output 1*

4-20 or
0-20 mA DC

14
15

15 V DC loop power supply*

14.5-18.0 V DC
(21 mA DC max.)

* Retransmission output 2 is available
only when “relay” is selected as the
type of control output.

16
17

Retransmission

output 2*

Default: 4-20 mA DC

Default: 4-20 mA DC

0-20mADC,
4-20mADC

UT

* If all of the contact inputs are set to OFF,
the controller uses the immediately
preceding target setpoint.

-

+

-

+

-

+

-

+

6
5

External contact outputs

4
7

34
33

DO1

DO2
DO3

COM

DO4

DO5

Relay Transistor

No function

Alarm 1 output

Alarm 2 output

Alarm 3 output

Common

Alarm 4 output

32

DO6

31

DO7

35

COM

No function

Common

UT

FAIL output

(ON when normal)

Relay contact rating: 240 V AC, 1 A
30 V DC, 1 A (resistance load)
Transistor contact rating: 24 V DC, 50 mA

Load resistance: 600

Ω or less

12

13

Note: Connecting a 250 Ω resistor to the terminals is
optional.
Model: X010-250-2 (resistor with M3.5 crimp-on terminal
lugs)

*

When receiving 4-20 mA DC current signals,

set the PV input type to 1-5 V DC (setpoint “41”).

䊏

Receiving 4-20 mA DC Current

Signals with the Controller

250 Ω

4-20mA

-

+

Default: Unspecified

retransmission type

Note: Select this option from the OT1 parameter.

Note: External Contact Input
If the power is turned on when the external contact input is OFF, the mode (SPN, R/L, or A/M)
existing before the power is turned off will be continued. (except for RUN/STOP)

*Alarm 4 output is available only when
"current/voltage pulse" is selected as the
type of control output.

■UT550 Single-loop Control (Model UT550-0■, UT550-2■or UT550-3■), Terminal Arrangements

<<Contents>> <<Index>>

2nd Edition Sept. 18, 2000-00

15

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation

1
2
3
4
5
6
7
8
9

10

41
42
43
44
45
46
47
48
49
50

31
32
33
34
35
36
37
38
39
40

21
22
23
24
25
26
27
28
29
30

11
12
13
14
15
16
17
18
19
20

Heating-side control output

Current/voltage pulse output

Cooling-side control
output

Cooling-side control
output

12
13

11
12
13

12
13

A

b

B

23
24
25
26
27

SDB(+)

SDA(-)

RDB(+)

RDA(-)

SG

8
9

10

L

N

1
2
3

NC

NO

COM

48
49
50

NC

NO

COM

+

-

+

-

CAUTION

Before carrying out wiring, turn off the power
to the controller and check that cables to be
connected are not alive with a tester or the like
because there is a possibility of electric shock.

Power supply

Power supply

Relay contact output

Contact rating: 250 V AC, 3 A

30 V DC, 3 A (resistance load)

Contact rating: 250 V AC, 3 A

30 V DC, 3 A (resistance load)

*Time proportional PID relay contact
output is configured at factory
before shipment.

*Time proportional PID
relay contact output is
configured at factory
before shipment.

* Wiring can only be carried out for controllers
with communication functions.
Maximum baud rate: 9600 bps

*

Wiring can only be carried out for

controllers with remote input.

TC input

RTD input

mV/V input

Installation category (overvoltage category): II (IEC1010-1)

21
22

Remote input

Specify in a range of
1-5 V DC, 0-2 V DC,
or 0-10 V DC.

-

+

RS-485 communication

Relay contact output

NOTE

Default: 1-5 V DC

OT1=4 (factory-set default) OT1=5

Correspondence between parameter OT1 and heating side output types/cooling side output types

OT1=6

OT1=7 OT1=8 OT1=9 OT1=10 OT1=11 OT1=12

The types of control output, “relay output” and “voltage pulse output” shown in the table above refer to those of time proportional control.
To change to a relay output for on-off control, select “Relay Terminals” and change the setpoint of the proportional band to “0.”

Heating side: Relay output
(terminals , and )
Cooling side: Relay output
(terminals , and )

1

2

3

Heating side: Voltage pulse output
(terminals and )
Cooling side: Relay output
(terminals , and )

16 17

Heating side: Current output
(terminals and )
Cooling side: Relay output
(terminals , and )

16

17

Heating side: Relay output
(terminals , and )
Cooling side: Voltage pulse output
(terminals and )

1

2

3

Heating side: Relay output
(terminals , and )
Cooling side: Current output
(terminals and )

1

2

3

Heating side: Voltage pulse output
(terminals and )
Cooling side: Voltage pulse output
(terminals and )

16 17

Heating side: Current output
(terminals and )
Cooling side: Voltage pulse output
(terminals and )

16 17

Heating side: Voltage pulse output
(terminals and )
Cooling side: Current output
(terminals and )

16

17

Heating side: Current output
(terminals and )
Cooling side: Current output
(terminals and )

16 17

* Factory-set to “PV retransmission.”

* Retransmission output 1 is not available if a

15 V DC loop power supply is used.

Heating-side
control output

14
15

Retransmission output 1*

4-20 or
0-20 mA DC

14
15

15 V DC loop power supply*

14.5-18.0 V DC
(21 mA DC max.)

* Retransmission output 2 is available
only when “relay” is selected as the
type of control output.

Default: 4-20 mA DC

-

+

-

+

*

The functionality of a contact input can be varied by changing the setting of the contact

input registration parameter.

* OT1 is a setup parameter.
You can change the settings of the parameter OT1 to
change the control output type.

19
18

External contact inputs

40
39
38
37

20

28
30

DI1

DI2

DI3
DI4
DI5
DI6

COM

COM

DI8

AUTO when DI1=ON
MAN when DI1=OFF

STOP when DI2=ON

RUN when DI2=OFF

DI3
DI4

1.SP2.SP 3.SP4.SP
ON

ONOFF

OFF

ON

ON OFF

OFF

5.SP6.SP7.SP8.SP
ON

ONOFF

OFF

ON

ON OFF

OFF
DI5
DI6

OFF
OFF

OFF
OFF

OFF
OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

OFF

ON

Common

Remote when DI8=ON

Local when DI8=OFF

Common

When switching among target setpoints 1 to 8:

19
18
40
39
38
37

20

28
30

DI1
DI2
DI3
DI4

DI5
DI6

COM

COM

DI8

+5V
+5V
+5V
+5V
+5V
+5V

36

DI7

36

DI7

+5V

+5V

Contact Transistor contact

Contact rating: 12 V DC, 10 mA or more

No function

UT

* If all of the contact inputs are set to OFF,
the controller uses the immediately
preceding target setpoint.

6
5

External contact outputs

4
7

34
33

DO1

DO2
DO3

COM

DO4

DO5

No function

Alarm 1 output

Alarm 2 output

Alarm 3 output

Common

Alarm 4 output

32

DO6

31

DO7

35

COM

No function

Common

UT

FAIL output

(ON when normal)

Relay contact rating: 240 V AC, 1 A
30 V DC, 1 A (resistance load)
Transistor contact rating: 24 V DC, 50 mA

48

47

46

47

46

47

46

47

46

47

46

47

46

49

50

48

49

50

48

49

50

46

47

+

-

0-20 mA DC
4-20 mA DC,

voltage pulse (12 V)

PV input

16
17

Current/voltage

pulse output

0-20mADC,
4-20mADC
Voltage pulse (12 V)

16
17

Retransmission

output 2*

Default: 4-20 mA DC

0-20mADC,
4-20mADC

-

+

-

+

A

llowable range: 100-240 V AC (10%)

(free voltage)
50/60 Hz shared

Load resistance: 600

Ω or less

12

13

Note: Connecting a 250 Ω resistor to the terminals is
optional.
Model: X010-250-2 (resistor with M3.5 crimp-on terminal
lugs)

*

When receiving 4-20 mA DC current signals,

set the PV input type to 1-5 V DC (setpoint “41”).

䊏

Receiving 4-20 mA DC Current

Signals with the Controller

250 Ω

4-20mA

-

+

* Not configured at factory before shipment

Default: Unspecified

retransmission type

Note: Select this option from
the OT1 parameter.

Note: Select this option from the
OT1 parameter.

Note: Select this option from the OT1 parameter.

Note: External Contact Input
If the power is turned on when the external contact input is OFF,
the mode (SPN, R/L, or A/M) existing before the power is turned
off will be continued. (except for RUN/STOP)

Relay Transistor

*Alarm 3 output is
available only when
"current/voltage pulse"
is selected as the type
of cooling-side control
output.

*Alarm 4 output is
available only when
"current/voltage pulse"
is selected as the type
of heating-side control
output.

■UT550 Single-loop Heating/Cooling Control (Model UT550-2■), Terminal Arrangements

<<Contents>> <<Index>>

GS 05D01C02-01E

2nd Edition Sept. 18, 2000-00

16

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation GS 05D01C02-01E

1

2
3
4
5
6
7
8
9

10

41
42
43
44
45

46
47
48
49
50

31
32
33
34
35
36
37
38
39
40

21
22
23
24
25

26
27
28
29
30

11
12
13
14
15

16
17
18
19
20

Feedback input

Resistance: 100 to 2.5 k

Position proportional control output

48
49

Relay contact output

50

H

(Direct)

L

(Reverse)

COM

Con

ta

ct

ra

tin

g: 250 V AC, 3 A

30 V DC, 3 A (resista

n

c

e

loa

d

)

8
9

10

L

N

23
24

* Wiring can only be carried out
for controllers with communication
functions.
Maximum baud rate: 9600 bps

25
26
27

SDB(+)

SDA(-)

RDB(+)

RDA(-)

SG

12

13

11
12
13

12
13

14
15

14
15

A
b

B

24 V DC loop

power supply

*Wiring can only be carried out for controllers with 24 V
DC loop power supply.

Power supply

Power supply

CAUTION

Before carrying out wiring, turn off the power
to the controller and check that cables to be
connected are not alive with a tester or the like
because there is a possibility of electric shock.

+

-

+

-

+

-

+

-

Retransmission output 1

15 V DC loop power supply

14.5-18.0VDC
(21 mA DC max.)

* PV retransmission is configured at factory
before shipment.

* If 15 V DC loop power supply is used,
retransmission output 1 cannot be used.

Installation category (overvoltage category): II (IEC1010-1)

NOTE

21
22

Remote input

* Wiring can only be carried out for
controllers with remote input.

Specify in a range of
1-5 V DC, 0-2 V DC,
or 0-10 V DC.

-

+

RS-485 communication

TC input

RTD input

mV/V input

21.6-28.0VDC

(30 mA DC max.)

43
44

+

-

Default: 1-5 V DC

0%

100%

47
46

45

*

The functionality of a contact input can be varied by changing the setting of the contact

input registration parameter.

19
18

External contact inputs

40
39
38
37

20

28
30

DI1

DI2

DI3
DI4
DI5
DI6

COM

COM

DI8

AUTO when DI1=ON
MAN when DI1=OFF

STOP when DI2=ON

RUN when DI2=OFF

DI3
DI4

1.SP2.SP 3.SP4.SP
ON

ONOFF

OFF

ON

ON OFF

OFF

5.SP6.SP7.SP8.SP
ON

ONOFF

OFF

ON

ON OFF

OFF

DI5

DI6

OFF
OFF

OFF
OFF

OFF

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

OFF
ON

Common

Remote when DI8=ON

Local when DI8=OFF

Common

When switching among target setpoints 1 to 8:

19
18
40
39
38
37

20

28
30

DI1
DI2
DI3

DI4

DI5
DI6

COM

COM

DI8

+5V
+5V
+5V
+5V
+5V
+5V

36

DI7

36

DI7

+5V

+5V

Contact Transistor contact

Contact rating: 12 V DC, 10 mA or more

No function

UT

* If all of the contact inputs are set to OFF,
the controller uses the immediately
preceding target setpoint.

6
5

External contact outputs

4
7

34
33

DO1

DO2
DO3

COM

DO4

DO5

Relay Transistor

No function

Alarm 1 output

Alarm 2 output

Alarm 3 output

Common

Alarm 4 output

32

DO6

31

DO7

35

COM

No function

Common

UT

FAIL output

(ON when normal)

Relay contact rating: 240 V AC, 1 A
30 V DC, 1 A (resistance load)
Transistor contact rating: 24 V DC, 50 mA

PV input

A

llowable range: 100-240 V AC (10%)

(free voltage)
50/60 Hz shared

* Not configured at factory before shipment

12

13

Note: Connecting a 250 Ω resistor to the terminals is
optional.
Model: X010-250-2 (resistor with M3.5 crimp-on terminal
lugs)

*

W

h

en receiving 4-20 mA DC current signals,

set the PV input type to 1-5 V DC (setpoint “41”).

䊏

Receiving 4-20 mA DC Current

Signals with the Controller

250 Ω

4-20mA

-

+

16
17

Retransmission

output 2

Default: 4-20 mA DC

0-20mADC,
4-20mADC

Default: 4-20 mA DC

4-20 mA DC,
0-20 mA DC

-

+

Default: Unspecified

retransmission type

Load resistance: 600

Ω or less

䊏

24 V DC Power Supply Wired to Sensor in
Two-wire System Configuration

12

13

43

44

250

Two-wire
transmitter

PV input

1-5 V DC

signal

Loop power

supply

21.6-

28.0 V DC

External
resistor
(Note)

Note: Connecting a 250  resistor to the terminals is optional.
Model: X010-250-2 (resistor with M3.5 crimp-on terminal lugs)

* The following method of wiring is only possible when the
controller is equipped with a 24 V DC loop power supply.

4-20mADC

Note: External Contact Input
If the power is turned on when the external contact input is OFF, the mode (SPN, R/L, or A/M)
existing before the power is turned off will be continued. (except for RUN/STOP)

■UT550 Single-loop Position Proportional Control (Model UT550-1■ or UT550-4■), Terminal Arrangements

<<Contents>> <<Index>>

2nd Edition Sept. 18, 2000-00

17

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation

1
2
3
4
5
6
7
8
9

10

41
42
43
44
45
46
47
48
49
50

31
32
33
34
35
36
37
38
39
40

21
22
23
24
25
26
27
28
29
30

11
12
13
14
15
16
17
18
19
20

8
9

Power supply

10

L

N

A

llowable range: 100-240 V AC (10%)

(free voltage)
50/60 Hz shared

Power supply

12
13

TC input

11
12

RTD input

13

12
13

mV/V input

21
22

Auxiliary input

Secondary PV input

Specify in a range of
1-5 V DC, 0-2 V DC,
or 0-10 V DC.

23
24

RS-485 communication

* Wiring can only be carried out
for controllers with communication
functions.
Maximum baud rate: 9600 bps

25
26
27

SDB(+)

SDA(-)

RDB(+)

RDA(-)

SG

*

The functionality of a contact input can be varied by changing the setting of the contact

input registration parameter.

*

The functionality of a contact output can be varied by
changing the setting of the contact output registration
parameter.

* Factory-set to “PV retransmission.”

* Retransmission output 1 is not available if a

15 V DC loop power supply is used.

24 V DC loop

power supply

*Wiring can only be carried out for controllers with
24 V DC loop power supply.

1
2

Relay contact output

3

Control output

NC

NO

COM

Contact rating: 250 V AC, 3 A

30 V DC, 3 A (resistance load)

*Time proportional PID relay contact
output is configured at factory
before shipment.

Note: Select this option from
the OT2 parameter.

CAUTION

Before carrying out wiring, turn off the power
to the controller and check that cables to be
connected are not alive with a tester or the like
because there is a possibility of electric shock.

Installation category (overvoltage category): II (IEC1010-1)

A

b

B

NOTE

-

+

-

+

-

+

21.6-28.0VDC

(30 mA DC max.)

43
44

+

-

Default: 1-5 V DC

OT2=0 (factory-set default) OT2=1

Correspondence between parameter OT2 and control output types

OT2=2

OT2=3

* OT2 is a setup parameter.
You can change the settings of the parameter OT2 to change the control output type.

Time proportional control

Relay output

(terminals , and )

1

2

3

Time proportional control

Voltage pulse output
(terminals and )

16

17

Current output

(terminals and )

16

17

On-off control

Relay output

(terminals , and )

1

2

3

Primary PV input

* Not configured at factory before shipment

19
18

External contact inputs

40
39
38
37

20

28
30

DI1

DI2

DI3
DI4
DI5
DI6

COM

COM

DI8

Cascade switching when

DI1 changes to on

Automatic switching when

DI2 changes to on

DI3
DI4

1.SP2.SP 3.SP4.SP
ON

ONOFF

OFF

ON

ON OFF

OFF

5.SP6.SP7.SP8.SP
ON

ONOFF

OFF

ON

ON OFF

OFF
DI5
DI6

OFF
OFF

OFF
OFF

OFF
OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

OFF

ON

Common

Manual switching when

DI8 changes to on

Common

When switching among target setpoints 1 to 8:

19
18
40
39
38
37

20

28
30

DI1
DI2
DI3
DI4

DI5
DI6

COM

COM

DI8

+5V
+5V
+5V
+5V
+5V
+5V

36

DI7

36

DI7

+5V

+5V

Contact Transistor contact

Contact rating: 12 V DC, 10 mA or more

STOP when DI7=ON
RUN when DI7=OFF

16
17

Continuous/voltage

pulse output

0-20mADC,
4-20mADC
Voltage pulse (12 V)

Control output

14
15

Retransmission output 1*

4-20 or
0-20 mA DC

14
15

15 V DC loop power supply*

14.5-18.0 V DC
(21 mA DC max.)

* Retransmission output 2 is available
only when “relay” is selected as the
type of control output.

16
17

Retransmission

output 2*

Default: 4-20 mA DC

Default: 4-20 mA DC

0-20mADC,
4-20mADC

UT

* If all of the contact inputs are set to OFF,
the controller uses the immediately
preceding target setpoint.

-

+

-

+

-

+

-

+

6
5

External contact outputs

4
7

34
33

DO1

DO2
DO3

COM

DO4

DO5

Relay Transistor

No function

Alarm 1 output

Alarm 2 output

Alarm 3 output

Common

Alarm 4 output

32

DO6

31

DO7

35

COM

No function

Common

UT

FAIL output

(ON when normal)

Relay contact rating: 240 V AC, 1 A
30 V DC, 1 A (resistance load)
Transistor contact rating: 24 V DC, 50 mA

Load resistance: 600

Ω or less

12

13

Note: Connecting a 250 Ω resistor to the terminals is
optional.
Model: X010-250-2 (resistor with M3.5 crimp-on terminal
lugs)

*

When receiving 4-20 mA DC current signals,

set the PV input type to 1-5 V DC (setpoint “41”).

䊏

Receiving 4-20 mA DC Current

Signals with the Controller

250 Ω

4-20mA

-

+

Default: Unspecified

retransmission type

Note: Select this option from the OT2 parameter.

Note: External Contact Input
If the power is turned on when the external contact input (either of Cascade, Automatic, and Manual) is ON,
the controller judges that the external contact input is changed to ON.

■UT550 Cascade Control, Terminal Arrangements

<<Contents>> <<Index>>

GS 05D01C02-01E

2nd Edition Sept. 18, 2000-00

18

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation GS 05D01C02-01E

1
2
3
4
5
6
7
8
9

10

41
42
43
44
45
46
47
48
49
50

31
32
33
34
35
36
37
38
39
40

21
22
23
24

25
26
27
28
29
30

11
12
13
14
15
16
17
18
19
20

8
9

Power supply

10

L

N

A

llowable range: 100-240 V AC (10%)

(free voltage)
50/60 Hz shared

Power supply

12
13

TC input

11
12

RTD input

13

12
13

mV/V input

21
22

Auxiliary input

Tracking Signal
(host device operation output)

Specify in a range of
1-5 V DC, 0-2 V DC,
or 0-10 V DC.

23
24

RS-485 communication

* Wiring can only be carried out
for controllers with communication
functions.
Maximum baud rate: 9600 bps

25
26
27

SDB(+)

SDA(-)

RDB(+)

RDA(-)

SG

*

The functionality of a contact input can be varied by changing the setting of the contact

input registration parameter.

*

The functionality of a contact output can be varied by
changing the setting of the contact output registration
parameter.

* Factory-set to “PV retransmission.”

* Retransmission output 1 is not available if a

15 V DC loop power supply is used.

24 V DC loop

power supply

*Wiring can only be carried out for controllers with
24 V DC loop power supply.

1
2

Relay contact output

3

Control output

NC

NO

COM

Contact rating: 250 V AC, 3 A

30 V DC, 3 A (resistance load)

*Time proportional PID relay contact
output is configured at factory
before shipment.

Note: Select this option from
the OT1 parameter.

CAUTION

Before carrying out wiring, turn off the power
to the controller and check that cables to be
connected are not alive with a tester or the like
because there is a possibility of electric shock.

Installation category (overvoltage category): II (IEC1010-1)

A
b

B

NOTE

-

+

-

+

-

+

21.6-28.0VDC

(30 mA DC max.)

43
44

+

-

Default: 1-5 V DC

OT1=0 (factory-set default) OT1=1

Correspondence between parameter OT1 and control output types

OT1=2

OT1=3

* OT1 is a setup parameter.
You can change the settings of the parameter OT1 to change the control output type.

Time proportional control

Relay output

(terminals , and )

1

2

3

Time proportional control

Voltage pulse output
(terminals and )

16

17

Current output

(terminals and )

16

17

On-off control
Relay output

(terminals , and )

1

2

3

PV input

* Not configured at factory before shipment

19
18

External contact inputs

40
39
38
37

20

28
30

DI1

DI2

DI3
DI4
DI5
DI6

COM

COM

DI8

AUTO when DI1=ON
MAN when DI1=OFF

STOP when DI2=ON

RUN when DI2=OFF

DI3
DI4

1.SP2.SP 3.SP4.SP
ON

ONOFF

OFF

ON

ON OFF

OFF

5.SP6.SP7.SP8.SP
ON

ONOFF

OFF

ON

ON OFF

OFF
DI5
DI6

OFF
OFF

OFF
OFF

OFF
OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

OFF

ON

Common

Output of tracking signal when DI8=ON

Output of PID computation when DI8=OFF

Common

When switching among target setpoints 1 to 8:

19
18
40
39
38
37

20

28
30

DI1
DI2
DI3
DI4

DI5
DI6

COM

COM

DI8

+5V
+5V
+5V
+5V
+5V
+5V

36

DI7

36

DI7

+5V

+5V

Contact Transistor contact

Contact rating: 12 V DC, 10 mA or more

No function

16
17

Current/voltage

pulse output

0-20mADC,
4-20mADC
Voltage pulse (12 V)

Control output

14
15

Retransmission output 1*

4-20 or
0-20 mA DC

14
15

15 V DC loop power supply*

14.5-18.0 V DC
(21 mA DC max.)

* Retransmission output 2 is available
only when “relay” is selected as the
type of control output.

16
17

Retransmission

output 2*

Default: 4-20 mA DC

Default: 4-20 mA DC

0-20mADC,
4-20mADC

UT

* If all of the contact inputs are set to OFF,
the controller uses the immediately
preceding target setpoint.

-

+

-

+

-

+

-

+

6
5

External contact outputs

4
7

34
33

DO1

DO2
DO3

COM

DO4

DO5

Relay Transistor

Alarm 3 output

Alarm 1 output

Alarm 2 output

FAIL output

(ON when normal)

Common

Alarm 4 output

32

DO6

31

DO7

35

COM

No function

No function

Common

UT

Relay contact rating: 240 V AC, 1 A
30 V DC, 1 A (resistance load)
Transistor contact rating: 24 V DC, 50 mA

Load resistance: 600

Ω or less

12

13

Note: Connecting a 250 Ω resistor to the terminals is
optional.
Model: X010-250-2 (resistor with M3.5 crimp-on terminal
lugs)

*

When receiving 4-20 mA DC current signals,

set the PV input type to 1-5 V DC (setpoint “41”).

䊏

Receiving 4-20 mA DC Current

Signals with the Controller

250 Ω

4-20mA

-

+

Default: Unspecified

retransmission type

Note: Select this option from the OT1 parameter.

Note: External Contact Input
If the power is turned on when the external contact input is OFF, the mode (SPN, R/L, or A/M)
existing before the power is turned off will be continued. (except for RUN/STOP)

■UT550 Loop Control for Backup, Terminal Arrangements

<<Contents>> <<Index>>

2nd Edition Sept.18, 2000-00

19

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation

1
2
3
4
5
6
7
8
9

10

41
42
43
44
45
46
47
48
49
50

31
32
33
34
35
36
37
38
39
40

21

22
23
24
25
26
27
28
29
30

11
12
13
14
15
16
17
18
19
20

8
9

Power supply

10

L

N

A

llowable range: 100-240 V AC (10%)

(free voltage)
50/60 Hz shared

Power supply

12
13

TC input

11
12

RTD input

13

12
13

mV/V input

21
22

Auxiliary input

Specify in a range of
1-5 V DC, 0-2 V DC,
or 0-10 V DC.

23
24

RS-485 communication

* Wiring can only be carried out
for controllers with communication
functions.
Maximum baud rate: 9600 bps

25
26
27

SDB(+)

SDA(-)

RDB(+)

RDA(-)

SG

*

The functionality of a contact input can be varied by changing the setting of the contact

input registration parameter.

*

The functionality of a contact output can be varied by
changing the setting of the contact output registration
parameter.

* Factory-set to “PV retransmission.”

* Retransmission output 1 is not available if a

15 V DC loop power supply is used.

24 V DC loop

power supply

*Wiring can only be carried out for controllers with
24 V DC loop power supply.

1
2

Relay contact output

3

Control output

NC

NO

COM

Contact rating: 250 V AC, 3 A

30 V DC, 3 A (resistance load)

*Time proportional PID relay contact
output is configured at factory
before shipment.

Note: Select this option from
the OT1 parameter.

CAUTION

Before carrying out wiring, turn off the power
to the controller and check that cables to be
connected are not alive with a tester or the like
because there is a possibility of electric shock.

Installation category (overvoltage category): II (IEC1010-1)

A
b

B

NOTE

-

+

-

+

-

+

21.6-28.0VDC

(30 mA DC max.)

43
44

+

-

Default: 1-5 V DC

OT1=0 (factory-set default) OT1=1

Correspondence between parameter OT1 and control output types

OT1=2

OT1=3

* OT1 is a setup parameter.
You can change the settings of the parameter OT1 to change the control output type.

Time proportional control

Relay output

(terminals , and )

1

2

3

Time proportional control

Voltage pulse output
(terminals and )

16

17

Current output

(terminals and )

16

17

On-off control
Relay output

(terminals , and )

1

2

3

PV input 1

PV input 2

* Not configured at factory before shipment

19
18

External contact inputs

40
39
38
37

20

28
30

DI1

DI2

DI3
DI4
DI5
DI6

COM

COM

DI8

AUTO when DI1=ON
MAN when DI1=OFF

STOP when DI2=ON

RUN when DI2=OFF

DI3
DI4

1.SP2.SP 3.SP4.SP
ON

ONOFF

OFF

ON

ON OFF

OFF

5.SP6.SP7.SP8.SP
ON

ONOFF

OFF

ON

ON OFF

OFF
DI5
DI6

OFF
OFF

OFF
OFF

OFF
OFF

ON

OFF

ON

OFF

ON

OFF

ON
OFF

OFF

ON

Common

PV input 2 when DI8=ON

PV input 1 when DI8=OFF

(NOTE 1)

Common

When switching among target setpoints 1 to 8:

19
18
40
39
38
37

20

28
30

DI1
DI2
DI3
DI4

DI5
DI6

COM

COM

DI8

+5V
+5V
+5V
+5V
+5V
+5V

36

DI7

36

DI7

+5V

+5V

Contact Transistor contact

Contact rating: 12 V DC, 10 mA or more

NOTE 1: When operating paramter U3 set to "2", effective to contact input.

No function

16
17

Current/voltage

pulse output

0-20mADC,
4-20mADC
Voltage pulse (12 V)

Control output

14
15

Retransmission output 1*

4-20 or
0-20 mA DC

14
15

15 V DC loop power supply*

14.5-18.0 V DC
(21 mA DC max.)

* Retransmission output 2 is available
only when “relay” is selected as the
type of control output.

16
17

Retransmission

output 2*

Default: 4-20 mA DC

Default: 4-20 mA DC

0-20mADC,
4-20mADC

UT

* If all of the contact inputs are set to OFF,
the controller uses the immediately
preceding target setpoint.

-

+

-

+

-

+

-

+

6
5

External contact outputs

4
7

34
33

DO1

DO2
DO3

COM

DO4

DO5

Relay Transistor

No function

Alarm 1 output

Alarm 2 output

Alarm 3 output

Common

Alarm 4 output

32

DO6

31

DO7

35

COM

No function

Common

UT

FAIL output

(ON when normal)

Relay contact rating: 240 V AC, 1 A
30 V DC, 1 A (resistance load)
Transistor contact rating: 24 V DC, 50 mA

Load resistance: 600

Ω or less

12

13

Note: Connecting a 250 Ω resistor to the terminals is
optional.
Model: X010-250-2 (resistor with M3.5 crimp-on terminal
lugs)

*

When receiving 4-20 mA DC current signals,

set the PV input type to 1-5 V DC (setpoint “41”).

䊏

Receiving 4-20 mA DC Current

Signals with the Controller

250 Ω

4-20mA

-

+

Default: Unspecified

retransmission type

Note: Select this option from the OT1 parameter.

Note: External Contact Input
If the power is turned on when the external contact input is OFF, the mode (SPN, R/L, or A/M)
existing before the power is turned off will be continued. (except for RUN/STOP)

■UT550 Loop Control with PV Switching, Terminal Arrangements

<<Contents>> <<Index>>

GS 05D01C02-01E

2nd Edition Sept. 18, 2000-00

20

<<Contents>> <<Index>>

■External Dimensions and Panel Cutout Dimensions

11

96

A/M

SET/ENT

96

PV

CAS
REM
MAN

LP2

AL1 2 3 4

General installation Side-by-side close installation

100

1 to 10 mm

0

+0.8

92

(Panel thickness)

Large bracket

112

91.8

Small bracket

[(N-1)96+92]117 min.

+0.8

21

Unit: mm

0

92

(53)

+0.8

0

145 min.

“N” stands for the number of controllers to be
installed.
However, the measured value applies if N  5.

+0.8

92

0

(25)

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation GS 05D01C02-01E 2nd Edition Sept. 18, 2000-00

<<Contents>> <<Index>>

■Model and Suffix Codes

Model Suffix Code Description

UT550

Type

Optional functions

Digital indicating controller (provided with retransmission output and 15 V DC loop power supply as standard)

-0 Standard type

-1 Position proportional type

-2 Heating/cooling type

-3 Standard type (with 24 V DC loop power supply)

-4 Position proportional type (with 24 V DC loop power supply)
None

0

With communication, auxiliary analog (remote) input, 6 additional DIs and 4 additional DOs

1

With communication, auxiliary analog (remote) input, and 1 additional DI

2

With 5 additional DIs and 4 additional DOs

3
4

With auxiliary analog (remote) input and 1 additional DI

22

Standard accessories: Brackets (mounting hardware), unit label, User’s Manuals, and User’s Manual (reference) (CD-ROM

version).

Specify the required optional function codes according to the UT mode to be used.

Correspondence between UT mode and suffix code

Suffix code

UT mode

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

Loop control with PV-hold function

(UT mode 1)

(UT mode 2)

(UT mode 3)
(UT mode 4)
(UT mode 5)
(UT mode 6)
(UT mode 7)
(UT mode 8)

App.: Function available, Cond.: Function available conditionally , N/A: Function not av ailable

00, 03,
20, 23,
30, 33

Cond.

N/A

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

Cond.

01, 02,

10, 13,

04,

40, 43
31, 32,
34

App. Cond.

App. N/A

App. N/A
App. N/A
App. N/A
App. N/A
App. N/A
App. Cond.

11, 12,
14,
41, 42,
44

App.

N/A

App.
App.
App.
App.
App.
App.

21, 22,
24

Remarks

Cond.: Remote target setting not available

App.

The remote target setting function requires the auxiliary analog
input (optional function) to be specified.

Cond.: UT mode 2 not available

Cond.

UT mode 2 can be used if one output is specified without
employing heating/cooling (two outputs) functions.

App.
App.

Auxiliary analog input is used for the cascade input.

App.

Auxiliary analog input is used for the tracking input.

App.

Auxiliary analog input is used for the PV input 2.

App.

Auxiliary analog input is used for the PV input 2.
Cond.: Remote target setting not available

App.

The remote target setting function requires the auxiliary analog
input (optional function) to be specified.

■Correspondence between the Model and Suffix Codes, and the Contact Input/Output

Terminals Provided

Check the model ordered and the presence/absence of contact inputs and outputs in the following table.

✓ indicate that the contacts are available.

Model and Suffix
Codes

UT550- 0
UT550- 1
UT550- 2
UT550- 3
UT550- 4

DI1 DI2 DI3 DI4 DI5 DI6 DI7 DO1 DO2 DO3

✓
✓
✓
✓
✓

Contact input terminals Contact output terminals

DI8

✓

✓

✓
✓
✓
✓✓✓✓✓✓✓✓✓
✓

✓✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

DO4

DO5 DO6 DO7

✓✓✓✓✓✓✓

✓

■Items to be Specified When Ordering

Model and suffix codes, necessary/unnecessary of User’s Manual or QIC.

All Rights Reserved. Copyright © 2000, Y okogawa M&C Corporation

GS 05D01C02-01E 2nd Edition Sept. 18, 2000-00