Yokogawa SDAU General Specifications

General

Specications

Model SDAU (Style R)
Digital Alarm Unit

GS 01B04K03-02E

 GENERAL

The SDAU Digital Alarm Unit accepts two input signals
(freely selectable from 1 to 5 V, mV, thermocouple
and RTD), and six detection results in alarm detecting
sections are freely connected to AND or to OR. Then
they are output to alarm relays (two points, or four
points for option).

Each alarm detecting section detects upper limit and
lower limit alarms of input absolute value, input rate­of-change and 2-input deviation. Either a normally
energized or de-energized is selectable for alarm
output relays.

The display setter on the front panel can display input
values and set/change parameters such as an alarm
setpoint. A PC (VJ77) or the JHT200 Handy Terminal
can also set/ change parameters.

With the VJ77 Parameter Setting Tool you can do the
following:

· Read/write all parameters at once

·Savereadparameterstoale

· Copy parameters to other devices of the same model

andsuxcode.

*1: The BT200 BRAIN Terminal of YOKOGAWA

Electric Corporation can also be connected.
The adapter for modular jack (E9786WH) is
required for connecting a PC (VJ77) or the
JHT200 Handy Terminal or BT200 to the Digital
Alarm Unit.

 INPUT/OUTPUT SIGNALS

Input Signals:

DCV Input

Input Signal

DC Voltage
Input

Measuring

Range

1 to 5 V DC Input Resistance: 1 MΩ

-50 to 150 mV DC

Input Resistance:1 MΩ

Input External Resistance:

Remarks

500 Ω or less

*1: ITS-90, JIS’95
*2: ASTM E988 Standard: W97Re3-W75Re25

(tungsten97% rhenium3%-tungsten75%
rhenium25%)

*3: ASTM E988 Standard: W95Re5-W74Re26

(tungsten95% rhenium5%-tungsten74%
rhenium26%)

RTD Input

Input Signal Measuring Range (°C)

JPt100 (JIS’89) -200.0 to 510.0 °C
Pt100 (ITS-90, JIS’97) -200.0 to 850.0 °C
Pt100 (IPTS-68, JIS’89) -200.0 to 660.0 °C
Pt50 (JIS’81) -200.0 to 649.0 °C

Input lead resistance : 10 Ω/lead or less

Number of Input Points

• Two points each 1 to 5 V DC (not

Two points
(SDAU-1 type)

Two points
(SDAU-2 type)

isolated between inputs mutually) or

• One point 1 to 5 V DC, and one point
mV, thermocouple or RTD (isolated
between inputs mutually)

Two points each universal inputs
(not isolated between inputs mutually)
mV, thermocouple or RTD freely selectable

Thermocouple Input

Input Signal

(*1)

Type K

(*1)

Type T

(*1)

Type J

(*1)

Type E

(*1)

Type B

(*1)

Type R

(*1)

Type S

(*1)

Type N
Type W3
Type W5

(*2)

(*3)

Measuring
Range(°C)

-270.0 to 1372.0

-270.0 to 400.0

-210.0 to 1200.0

-270.0 to 1000.0

100.0 to 1820.0

-50.0 to 1768.0

-50.0 to 1768.0

-270.0 to 1300.0
0 to 2315
0 to 2315

Remarks

Input Resistance:

1 MΩ

Input External Resistance:

500 Ω or less

Output Signals: Relay contact

Contact Capacity

100V AC 2A (Resistive load)
220V AC 0.5A (Resistive load)

30V DC 2A (Resistive load)

125V DC 0.5A (Resistive load)

Contact life expectancy: 600,000 times

GS 01B04K03-02E

7th Edition Jan. 2021

Number of Output Points:

Two sets of transfer contacts
Four sets of NC or NO contacts when

Alarm Output

Failure Output

Retransmission
Output
(Option)

/RLY4 option is selected.
Specify normally energized/normally de-

energized by parameter.
One set of NC or NO contact

Always normally energized

Not available when /RLY4, /VLT or /CUR

option is selected.
One point 1 to 5 V DC or 4 to 20 mA DC

/VLT: 1 to 5 V DC
/CUR: 4 to 20 mA DC

Failure output is not available.

Can not be combined with /RLY4

 ALARM FUNCTIONS

Alarm Detecting Sections 3 (each independent)

Input Mode

Alarm Setting Upper and lower limit values, -19999 to 32000 (in engineering units)
Hysteresis 0 to 32000 (in engineering units)
Rate-of-Change Alarm

Sampling Time
Alarm Output Sections

(each independent)
Alarm Output Connection Six detection results are freely connected to AND or to OR.

Alarm Timer Mode

Timer Setting

Direction of Relay Action Set normally energized / de-energized.

Contact

Indicator Lamp Yellow lamp (ALMn) lights up on alarm.

Input absolute alarm
2-input deviation alarm
Input rate-of-change alarm

1 to 9999 s

2 or 4 when /RLY4 option is selected.

Alarm output (delay) timer

ON/OFF delay timer

Alarm output timer

Alarm ON/OFF delay

(dead time) timer

Two sets of transfer contacts or

Four sets of NC or NO contacts when /RLY4 option is selected.

0 to 600 s (in 1-second increment)
However, about a 0.2 second delay is added to the above set time to
prevent wrong operation.

0 to 999 s (in 1-second increment)

2

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GS 01B04K03-02E Jan.12, 2021-00

 ALARM FUNCTION BLOCK DIAGRAM

Note 2: Any of six types of HI Alarm / LO Alarm can be connected.

F01.ai

3

PV1 PV2

Alarm

Detecting

Section

Alarm

Connection/

Output
Section

Note 1: Select one of them to use.

Deviation

(PV1-PV2)

(Note 1)

Alarm

Detection 1

HI Alarm LO Alarm

(Note 2)

AND/OR Connection

Alarm timer

Alarm Output 1

Rate-of-

change

PV1

Rate-of-

change

PV2

(Same as Alarm

(Same as Alarm

Detection 1)

Alarm

Detection 2

HI Alarm LO Alarm

HI Alarm LO Alarm

/RLY4

only

(Same as

Alarm Output 1)

Alarm Output 2 Alarm Output 3 Alarm Output 4

(Same as

Alarm Output 1)

Alarm Output 1)

Detection 1)

Alarm

Detection 3

/RLY4

only

(Same as

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GS 01B04K03-02E Jan.12, 2021-00

4

 MOUNTING AND APPEARANCE

Mounting: Mount on an indoor rack.
Signal Connection: M4 screw terminals
Power Supply Connection: Grounded two-pole plug,

or M4 screw terminals

External Dimensions: 180 x 48 x 300 (mm)

(Height x Width x Depth from the
mounting face)

Weight: Approx. 2 kg (including rack case)

 DISPLAY FUNCTIONS

Display Setter: 5 digits, 2 lines, 11-segment LED

Indicator Lamps:
For all except /RLY4 option

Alarm status indication: ALM1,2 (yellow) 2
FAIL status indication: F (red) 1

Error indication: E (yellow) 1

For /RLY4 option

Alarm action indication: ALM1,2,3,4 (yellow) 4

Example of Display Data

Parameter Code Description

PVn Displays PVn
MODn Species input mode n
nH Sets upper-limit alarm nH

nL Sets lower-limit alarm nL

AN.OR.n Species AND/OR connection

n: Number of input point, number of alarm detection

In engineering units: -19999 to 32000
Decimal point position selectable

or number of alarm connection.

 SETTING FUNCTIONS

Parameters can be set using the following three
ways.
(1) Display setter on the front panel

(2) VJ77 Parameters Setting Tool or JHT 200 Handy

Terminal

*1: The BT200 BRAIN Terminal of YOKOGAWA

(3) RS-485 Communication (when /COM option is

specied)

Key switches 4
(→ (SHIFT), ↑ (INCR), SET, )
Setting enable switch 1

(*1)

Electric Corporation can also be connected.
The adapter for modular jack (E9786WH) is
required for connecting a PC (VJ77), the JHT200
Handy Terminal or BT200 to the Digital Alarm
Unit.

 NORMAL OPERATING CONDITIONS

Ambient
Temperature

Ambient
Humidity

Power
Supply
Voltage

0 to 50°C

5 to 90%RH (no condensation)

AC / DC both usage

100V version DC 20 to 130 V, no polarity

100V version AC

220V version DC

220V version AC

80 to 138 V,
47 to 63 Hz

120 to 340 V,
no polarity

138 to 264 V,
47 to 63 Hz

 STANDARD PERFORMANCE

Performance in the standard operating condition (at
23°C±2°C, 50±10%RH)

Input Accuracy See the table: Input accuracy in page 4.
Alarm Action

Repeatability

E󰀨ect of ambient

temperature
Maximum

Current or Power
Consumption

Insulation
Resistance

Withstanding
Voltage

Burnout Time Within 60 s

Same as input accuracy

Twice of input accuracy / 10°C

240 mA for 24 V DC
17 VA for 100 V AC
22 VA for 220 V AC

Between I/O terminals and ground pin:

100 MΩ/500 V DC

Between power pins and ground pin:

100 MΩ/500 V DC

Between input terminal and ground pin:

500 V AC for 1 minute
Between output terminal, power pins and
ground pin:
1000 V AC for 1 minute (100 V version)
1500 V AC for 1 minute (220 V version)

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GS 01B04K03-02E Jan.12, 2021-00

5

 RECOVERY FROM POWER FAILURE

HOT Start: Continues the operation from the alarm

COLD Start: Power-on restart

* HOT start or COLD start is selectable by parameter.

Table: Input Accuracy

Input signal Accuracy

DCV input

T/C Accuracy (*

Type K

Type T

Type J

Type E

Type B

Type R

Type S

Type N

Type W3 0.0 to 2315.0 °C ±2.0 °C
Type W5 0.0 to 2315.0 °C ±2.0 °C

JPt100 (JIS’89) -200.0 to 510.0 °C
Pt100 (ITS-90,JIS’97) -200.0 to 850.0 °C
Pt100 (IPTS-68,JIS’89) -200.0 to 660.0 °C
Pt50 (JIS’81) -200.0 to 649.0 °C

(*1)
Note 1: E󰀨ect of ambient temperature:

Note 2: For thermocouple inputs except type B, add

Add the following (1) or (2), whichever is the larger:

(1) All types except types R and S: 0.5°C
Types R and S: 1°C
(2) Multiply the value in (1) by K, where

status immediately prior to power
failure.
(Hot start cannot be made for input
rate-of-change alarms. When the
alarm timer mode is set to alarm output

timer, ALM3 and ALM4 cannot be HOT

started.)

1 to 5V DC ±0.1%

-50.0 to 150.0mV DC ±20µV

1)

-270.0 to 0 .0 °C ±{0.5+A

0.0 to 1300.0 °C ±0.5 °C

1300.0 to 1372.0 °C ±1.0 °C

-270.0 to 0.0 °C ±{0.3+A

0.0 to 400.0 °C ±0.3 °C

-210.0 to 0.0 °C ±{0.3+A

0.0 to 1100.0 °C ±0.3 °C

1100.0 to 1200.0 °C ±1.0 °C

-270.0 to 0.0 °C ±{0.3+A

0.0 to 900.0 °C ±0.3 °C

900.0 to 1000.0 °C ±1.0 °C

100.0 to 600.0 °C ±{3.0+A

600.0 to 1820.0 °C ±3.0 °C

-50.0 to 0.0 °C ±4.0 °C

0.0 to 400.0 °C ±2.0 °C

400.0 to 1768.0 °C ±1.0 °C

-50.0 to 0.0 °C ±4.0 °C

0.0 to 400.0 °C ±2.0 °C

400.0 to 1768.0 °C ±1.0 °C

-270.0 to 0.0 °C ±{1.0+A

0.0 to 1300.0 °C ±1.0 °C

RTD Accuracy

±0.01%/°C of measuring range

the reference junction compensation error (see
below) to the accuracy above.

K=(Thermocouple output change/°C near normal

temperature) ÷ (Thermocouple output change

/°C near input temperature.)

(*2)

} °C

(*2)

} °C

(*2)

} °C

(*2)

} °C

(*3)

} °C

(*2)

} °C

±0.25°C

(*2)
For measured temperatures below 0 °C, add the
following A to the accuracy above.

- Measured temperature : -200 °C to below 0 °C
A = 0.0025 x | measured temperature |

- Measured temperature : below -200 °C
A = 0.1 x | measured temperature |
(*3)
For measured temperatures below 600 °C, add the
following B to the accuracy above.

- Measured temperature : 300 °C to below 600 °C
B = 0.02 x | measured temperature - 600 |

- Measured temperature : below 300 °C
B = 0.1 x | measured temperature - 300 | + 6

 SELF-DIAGNOSTIC FUNCTIONS

F Lamp ON: CPU failure, A/D conversion failure,

E Lamp ON: Input signal overrange

*1: When more than 106.25%, or -6.25% or less of

input range upper limit (RH) and input range lower

limit (RL).

Failure Output: Failure contact output when F

EEPROM failure, EEPROM SUM
failure or RJC error

(*1)

, input

burnout, HOT start unavailable

lamp or E lamp lights up. However,
failure output action is in E lamp ON
selected by parameter. (Note: Only

when /CUR, /VLT or /RLY4 option is

not selected.)

 CALIBRATION FUNCTIONS

Allow 0% and 100% points to be calibrated with an
accuracy of 1% or better when input signal is 1 to 5 V
by display setter on the front panel.

 WIRING RESISTANCE CORRECTION

FUNCTIONS

If an error occurs because of input wiring resistance
when mV DC, thermocouple or RTD input, input
wiring resistance can be corrected.

 OPTIONS

/A2ER: 220 V version with power supply plug
/TB/A2: 220 V version power supply terminal
/NHR: Without case
/FBP: Power supply fuse bypass
/LOCK: Power supply plug with lock
/WSW: With spring washer
/REK: Mount to same line with EK series rack
/TB: With power supply terminal
/VLT: With 1 to 5 V output
/CUR: With 4 to 20 mA output
/RLY4: Four points of alarm outputs
/COM: With RS-485 communication function
/BU: Burnout upscale
/BD: Burnout downscale

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GS 01B04K03-02E Jan.12, 2021-00

 COMMUNICATION FUNCTIONS

(/COM OPTION)

Input read and parameter read/write are possible.

Communication Interface: 1 channel

Standards: EIA RS-485
Communication System: 2-wire, half-duplex
Baud Rate: 1200, 2400, 4800 and 9600 bps

Communication Protocol: MODBUS, PC link, and

Ladder

Maximum Units Connectable: 31 units
Maximum Communication Distance: 1200 m
Communication cable: Shielded twisted-pair cables

(AWG24 or the equivalent)
for communication wiring
cables.

 RETRANSMISSION OUTPUT

FUNCTIONS (/VLT and /CUR
OPTIONS)

/VLT: 1 to 5 V output of measured value or 2-input

deviation

/CUR: 4 to 20 mA output of measured value or

2-input deviation

6

Accuracy: ±0.1% of span

Load resistance:

2 kΩ or more

Accuracy: ±0.1% of span

Load resistance:

750 Ω or less

Retransmission
Output
Accuracy
(Option)

1 to 5 V DC

(/VLT)

4 to 20 mA

(/CUR)

Retransmission Output Accuracy Guaranteed Range:

mV Input

Span 10 to 100 mV DC

Three times

Zero
Elevation

the span, or
within ±50 mV,
whichever is the
smaller

Retransmission output accuracy guaranteed range is

within the range above and within 0.0% to 100.0%
of span.

Thermocouple

Input

10 to 63 mV
(converted
based on thermo
electromotive
force)

Three times
the span, or
within ±25 mV,
whichever is the
smaller

RTD Input

50 to 500°C

Within ve

times the
span

 ACCESSORIES

Label sheet: 1 sheet

Reference junction bracket :

For SDAU-120-xx*R/NHR or
SDAU-270-xx*R/NHR

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GS 01B04K03-02E Jan.12, 2021-00

 MODEL AND SUFFIX CODES

Model Su󰀩x Codes Optional Su󰀩x Codes Description

SDAU Digital Alarm Unit

Input Signal 2

Input Signal 1

Always 0 0 Always 0

Auxiliary Codes

Available Combination

Standard Specications:

SDAU-100, SDAU-110
SDAU-120, SDAU-130
SDAU-270

Auxiliary Codes:
SDAU-100: -SV
SDAU-110: -MV
SDAU-120: from -TK to -TS
SDAU-130: from -PA to -PD
SDAU-270: -UN

Style Code *R Style R

Common Options

Note 1: /VLT, and /CUR options can be combined with only –UN auxiliary code.

/RLY4 option can be combined with only –SV or –UN auxiliary codes.
/VLT, /CUR and RLY4 options can not be combined with each other.

Note 2: For two points of 1 to 5 V inputs (-SV), burnout upscale or burnout downscale is not selectable.
Note 3: For universal inputs, 1 to 5 V is not selectable.

Note 4: Specify the option codes /TB and /A2 at the same time.

Note: There is no di󰀨erence between the latest and the previous temperature tables as far as applying them to the YEWSERIES.

- TC: Latest version; IEC60584-1: 2013/JIS C1602:2015
Previous version; IEC60584-1: 1995/JIS C1602:1995

- RTD Latest version; IEC60751- 2008/JIS C1604:2013
Previous version; IEC751- 1995/JIS C1604:1997

-1 Input signal 2: 1 to 5 V

-2 Input signal 2: Universal
0 1 to 5 V
1 mV
2 TC (Thermocouple)
3 RTD
7 Universal

(Note 3)

-SV Two points of 1 to 5 V inputs

-MV mV input

-TK Type K (ITS-90,JIS’95)

-TT Type T (ITS-90,JIS’95)

-TJ Type J (ITS-90,JIS’95)

-TE Type E (ITS-90,JIS’95)

-TB Type B (ITS-90,JIS’95)

-TR Type R (ITS-90,JIS’95)

-TS Type S (ITS-90,JIS’95)

-PA JPt 100 (JIS’89)

-PB Pt50 (JIS ’81)

-PD Pt100 (ITS-90, JIS’97)

-UN Universal (SDAU-270 only)

/A2ER 220 V version power supply plug
/TB/A2 220 V version power supply terminal
/NHR Without case
/FBP Power supply fuse bypass
/LOCK Power supply plug with lock
/WSW With spring washer
/REK Mount to same line with EK series rack
/TB With power supply terminal
/VLT With 1 to 5 V output

(Note 1)

/CUR With 4 to 20 mA output
/RLY4 Four points of alarm outputs
/COM With RS-485 communication function
/BU Burnout upscale
/BD Burnout downscale

(Note 2)

(Note 2)

(Note 1)

7

(Note 3)

(Note 3)

(Note 4)

(Note 1)

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GS 01B04K03-02E Jan.12, 2021-00

 ORDERING INSTRUCTIONS

F02.ai

F03.ai

1. Model, su󰀩x codes and auxiliary codes, and optional su󰀩x codes if necessary

2. SDAU-110, -120, -130: Upper limit of input range (RH1), lower limit of input range (RL1). Specify RH1 and RL1
within the measuring range of Input/output signal specications, where RL1<RH1.

Initial values

RH1 parameter; 100.0 when mV input, maximum value of measuring range when temperature input
RL1 parameter; 0.0 when mV input, minimum value of measuring range when temperature input

3. SDAU-270: Select the sensor type from the input signals in Input/Output Signals on Page 1. However, 1 to 5 V is

not selectable. Initial value: Pt100 (ITS90, JIS’97)
(Note: Sensor type is selectable for input 1 and input 2 respectively.)

 TERMINAL CONNECTIONS

● Input/Output Terminals

8

6

Terminal
Designation

(*1)

Excluding /RLY4, /VLT and /CUR /RLY4 /VLT or /CUR

A

NC

B

COM
NC, NO

C

COM

D

NC

F

COM

H
J

NO

K

NO

1
2
3
4
5
6
7
8

*1: Terminal for connecting the reference junction bracket.
*2: Switch NC/NO using jumper.

+

-

+

-

NC: Relay normally closed contact (closed when relay de-energized).
NO: Relay normally open contact (open when relay de-energized).

Alarm output 1

(*2)

Failure output

Alarm output 2

1 to 5 V, mV, TC Input RTD Input

Input 1

Input 2

J K

B BDH

A

F

C

Refer to
External
Dimensions

1

5

3

4

2

8

7

● RS485 Communication Terminals (/COM Option)

NC, NO
COM
NC, NO
COM
NC, NO
COM

COM
NC, NO

Description

(*2)

(*2)

(*2)

(*2)

B+

A-

Alarm output 1

Alarm output 4

Alarm output 2

Alarm output 3

A

B

B

A
B
B

NC
COM

+

-

NC
COM

NO
NO

Input 1

Alarm output 1

Retransmission output
1 to 5 V or 4 to 20 mA
Alarm output 2

Input 2

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COM

GS 01B04K03-02E Jan.12, 2021-00

<<Contents>> <<Index>>

Without/COM With/COM

F04.ai

Unit: mm

Without/COM With/COM

F05.ai

 EXTERNAL DIMENSIONS

● Power Supply Plug Connection Type

9

9

180

Electric Electric

48

48 52 300

● Power Supply Terminal Type

Electric Electric

180

180

220V Power
supply plug

180

100V Power
supply plug

22 136

13622

48 48 71 300

All Rights Reserved. Copyright © 2004, Yokogawa Electric Corporation

Subject to change without notice.

Power supply terminals

GS 01B04K03-02E Jan.12, 2021-00