Yokogawa SDAU User Manual
User’s
Manual
IM 01B04K03-02E
Model SDAU (Style R)
Digital Alarm Unit
IM 01B04K03-02E
8th Edition
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IM 01B04K03-02E
8th Edition: Jan.29,2021-00
IM 01B04K03-02E 8th Edition
Model SDAU (Style R)
Digital Alarm Unit
CONTENTS
1. INTRODUCTION .................................................................................. 1-1
1.1 Inspection ............................................................................................. 1-2
1.2 Documentation Conventions ............................................................... 1-3
1.3 Notice .................................................................................................... 1-4
1.4 About Compatibility with the Conventional Model (Style E) ............. 1-6
2. GENERAL ............................................................................................. 2-1
2.1 Standard Specifications ....................................................................... 2-2
2.2 Model and Suffix Codes ............................................................................. 2-3
2.3 Accessory ...................................................................................................... 2-4
3. INSTALLATION .................................................................................... 3-1
3.1 External Wiring ..................................................................................... 3-1
4. FUNCTIONS ......................................................................................... 4-1
4.1 Operation Principle .............................................................................. 4-1
4.1.1 Hardware Block Diagram ........................................................... 4-1
4.2 Input Processing Function .................................................................. 4-3
4.3 Alarm Processing Function ................................................................. 4-5
4.3.1 Alarm-Detecting Sections .......................................................... 4-6
4.3.2 Alarm Connection / Output Sections .......................................... 4-7
4.3.3 Example of Setting the Alarm Functions .................................. 4-10
4.4 Retransmission Output Function (for /VLT and /CUR Options) ...... 4-11
4.5 Communication Function (for /COM Option) .................................... 4-12
4.6 Function of Recovery from Power Failure ........................................ 4-13
4.7 Self-Diagnostic Function ................................................................... 4-14
4.8 Alarm/Failure Outputs at Power-on and Power Failure .................... 4-15
5. SETTING ............................................................................................... 5-1
5.1 Names of Components ......................................................................... 5-3
5.2 Part Names of the Display Setter ......................................................... 5-4
5.3 Setting Jumpers ................................................................................... 5-6
5.3.1 Checking Setting Jumpers and their Locations ........................... 5-7
5.3.2 Change of Setting Jumper ......................................................... 5-8
5.4 Settings Done from the Front Panel of the Alarm Unit ....................... 5-9
5.4.1 How to Operate the Key Switches .............................................. 5-9
5.4.2 Settings Using Key Switches (Example) .................................. 5-10
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5.5 Parameter Change Disable Function................................................. 5-11
5.6 Various Display Modes ...................................................................... 5-12
5.6.1 Display at Power ON ............................................................... 5-12
5.6.2 LOCK Display .......................................................................... 5-12
5.6.3 Display in Display Shutoff Mode .............................................. 5-12
5.6.4 Error Display ............................................................................ 5-13
5.6.5 Display of Self-Diagnostic Results ........................................... 5-13
5.6.6 Detailed Alarm Status Display .................................................. 5-14
5.7 Settings Using the JHT200 Handy Terminal ..................................... 5-16
5.8 Settings Using a PC (VJ77) ................................................................ 5-17
6. PARAMETERS ..................................................................................... 6-1
6.1 Configuration of Parameters ............................................................... 6-1
6.2 Display on Front Panel: Development View of Parameters ............... 6-2
6.3 Display on Front Panel: List of Parameters ........................................ 6-6
6.4 BRAIN Communication: List of Parameters ...................................... 6-22
7. MAINTENANCE ................................................................................... 7-1
7.1 Test Equipments ................................................................................... 7-1
7.2 Reference Table of Thermocouple and RTD ....................................... 7-1
7.3 Adjustment and Check ......................................................................... 7-1
7.3.1 Input Adjustment ........................................................................ 7-2
7.3.2 Correction of Input W iring Resistance ........................................ 7-4
7.4 Check of Reference Junction Temperature Compensation Action.... 7-6
7.5 List of Replaceable Parts ..................................................................... 7-7
8. TROUBLESHOOTING ........................................................................ 8-1
8.1 Actions under Fault Conditions .......................................................... 8-2
9. POWER SUPPLY TERMINAL CONNECTINS (Options /TB, /TB/A2
and /REK) ...................................................................................... 9-1
9.1 Names of Components and Power Terminal Symbols ....................... 9-2
9.2 Power Supply and Ground Wiring ...................................................... 9-3
General Specifications
Revision Information
<1. INTRODUCTION >
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1. INTRODUCTION
This manual describes the functions and operations of the SDAU Digital Alarm
Unit.
Intended Readers
This manual is intended for personnel in charge of:
Installation and wiring
Instrumentation and setup of functions
Operation and monitoring of the controller
Maintenance of equipment
Related Documents
The following documents all relate to the SDAU Digital Alarm Unit. Read them as
necessary. The codes enclosed in parentheses are the document numbers.
• Rack-Mounted Instruments (IM 1B4F2-01E)
Describes mounting and wiring for YS80 rack-mounted instruments.
• Model VJ77 PC-based Parameters Setting Tool (IM 77J01J77-01E)
Describes operation of the VJ77 parameters setting tool.
• Model JHT200 Handy Terminal (IM 77J50H01-01EN)
Describes operation of JHT200.
• YS80*R Rack-Mounted Instruments Communication Functions
Describes the communication functions of SDAU. (IM 01B04F01-20E)
<1. INTRODUCTION >
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1.1 Inspection
The SDAU digital alarm unit is shipped only after stringent inspection at the factory.
Visually inspect the product upon delivery to make sure it is not damaged in any way.
Store the box and inner packing material of the package in a safe place / they may be
needed if there is a problem with the product and it needs to be sent back for repair.
Check of Model and Suffix Codes
The model and suffix codes are indicated on the Name plate attached to the front cover
of the instrument. Crosscheck this information with the model and suffix codes of
Section 2.2 to ensure that the product is as specified in the order.
Figure1.1 Appearance and Name plate (Description example)
Confirmation of the Package Contents
Check the package contents against the list below. If anything is missing or damaged,
immediately contact the sales office from which you purchased the product or your
nearest Yokogawa representative.
• SDAU Digital Alarm Unit ................................................................................. 1
• Reference Junction Bracket (Parts No.: L4040EN)
(only for SDAU-120-xx*R/NHR or SDAU-270-xx*R/NHR) ............................. 1
• Alarm Label (Parts No.: L4040JA) .................................................................. 1 sheet
• Precautions on the Use of the YS80 Series.................................................... 1
Downloadable Electronic Manuals
You can download the latest manuals from the following website:
To view the User ’s Manuals, use Adobe Acrobat Reader of Adobe Systems Incorporated.
http://www.yokogawa.com/ns/ys/
<1. INTRODUCTION >
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1.2 Documentation Conventions
This manual uses the following notational conventions.
Symbols
The following symbols are used in this manual.
Indicates that operating the hardware or software in a particular manner may damage it
or result in a system failure.
Draws attention to information that is essential for understanding the operation and/or
features of the product.
TIP
Gives additional information to complement the present topic and/or describes terms
specific to this document.
See Also
Gives reference locations for further information on the topic.
Description of Displays
Some of the representations of product displays shown in this manual may be
exaggerated, simplified, or partially omitted for reasons of convenience when explaining
them.
QR Code
The product has a QR Code pasted for efficient plant maintenance work and asset
information management. It enables confirming the specifications of purchased products
and user’s manuals.
For more details, please refer to the following URL.
https://www.yokogawa.com/qr-code
QR Code is a registered trademark of DENSO WAVE INCORPORATED.
<1. INTRODUCTION >
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1.3 Notice
This User’s Manual
This manual should be passed on to the end user. Keep at least one extra copy of
the manual in a safe place.
Read this manual carefully to gain a thorough understanding of how to operate this
product before you start using it.
This manual is intended to describe the functions of this product. Yokogawa Electric
Corporation (hereinafter simply referred to as Yokogawa) does not guarantee that
these functions are suited to the particular purpose of the user.
Under absolutely no circumstances may the contents of this manual, in part or in
whole, be transcribed or copied without permission.
The contents of this manual are subject to change without prior notice.
Every effort has been made to ensure accuracy in the preparation of this manual.
Should any errors or omissions come to your attention however, please contact your
nearest Yokogawa representative or sales office.
Protection, Safety, and Prohibition against Unauthorized Modification
The following safety symbols are used on the product and in this manual.
If this symbol is indicated on the product, the operator should refer to the explanation
given in the user’s manual in order to avoid personal injury or death to either
themselves or other personnel, and/or damage to the instrument. The manual
describes that the operator should exercise special care to avoid shock or other
dangers that may result in injury or loss of life.
Protective ground terminal:
This symbol indicates that the terminal must be connected to ground prior to
operating the equipment.
Function ground terminal:
This symbol indicates that the terminal must be connected to ground prior to
operating the equipment.
AC voltage:
This symbol indicates that AC voltage is present.
DC voltage:
This symbol indicates that DC voltage is present.
<1. INTRODUCTION >
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In order to protect the product and the system controlled by it against damage and
ensure its safe use, make certain that all of the instructions and precautions relating
to safety contained in this document are strictly adhered to. Yokogawa does not
guarantee safety if products are not handled according to these instructions.
If protection/safety circuits are to be used for the product or the system controlled by
it, they should be externally installed on the product.
Do not turn off the power of the product during adjustment.
When you replace the parts or consumables of the product, only use those specified
by Yokogawa.
Do not modify the product.
Force Majeure
Yokogawa does not make any warranties regarding the product except those
mentioned in the WARRANTY that is provided separately.
Yokogawa assumes no liability to any party for any loss or damage, direct or
indirect, caused by the use or any unpredictable defect of the product.
<1. INTRODUCTION >
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1.4 About Compatibility with the Conventional
Model (Style E)
The operation and function differ from the conventional model.
Read this manual carefully to gain a thorough understanding of how to operate this
product before you start using it.
Be sure to confirm the parameters such as alarm set point and setting jumper
referring to ''6. PARAMETERS'' before installing the product in a system or plant.
After confirming them, install the product in a system or plant and turn on the power.
When replacing an internal unit with the old style code (SDAU-1xx-xx*E) with an
internal unit with the SDAU-120-xx*R or SDAU-270-UN*R style code, the reference
junction contact fitting (for contact with the RJC sensor) must be installed (or
replaced). For more information, see Section 2.3, “Accessory.”
<2. GENERAL>
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2. 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 present in alarmdetecting sections are freely AND-connected or OR-connected. These results are
then output to alarm relays (two points, or four points if the optional suffix is
specified).
Each alarm-detecting section detects high limit and low limit alarms of an input
absolute value, input rate-of-change, and two-input deviation. Either a normally
energized or de-energized state is selectable for alarm output relays.
The digital display and key switches on the front panel allow input values to be
displayed and parameters such as alarm setpoints to be set or changed.
Parameters can also be set or changed by using a PC (VJ77) or the JHT200 Handy
Terminal
The self-diagnostic function also allows failure outputs to be generated.
With the VJ77 Parameter Setting Tool you can do the following:
*1: The B T200 BRAIN Term inal of Yokogawa E lectric Corporati on can also be connected.
Modular jack adapter (part no.: E9786WH) is requi red t o connect a PC (VJ77), the JHT200 Handy Termin al or BT200
*1
.
· Read/write all parameters at once
· Save read parameters to a file
· Copy parameters to other devices of the same model and suffix code.
to the Digital Alarm Unit.
Figure 2.1 Appearance of the SDAU Digital Alarm Unit
<2. GENERAL>
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2.1 Standard Specifications
Please see the General Specifications (GS 01B04K03-02E) at the end of this manual.
<2. GENERAL>
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Model
Suf fix Codes
Optional Suf fix Codes
Description
SDAU
Digital Alarm Unit
-1 Input signal 2: 1 to 5 V
-2 Input signal 2: Universal (Note 3)
0
1 to 5 V
1
mV 2 TC (Thermoc ouple)
3
RTD 7 Universal (Note 3)
Always 0
0 Always 0
Auxiliary Codes
SDAU-270: -UN
-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 (Note 3)
Style Code
*R Style R
/A2ER
220 V version power supply plug
/TB/A2
220 V version power supply terminal (Note 4)
/NHR
W ithout c ase
/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 (Note 1)
/RLY4
Four points of alarm outputs (Note 1)
/COM
With RS-485 communication function
/BU
Burnout upscale ( Note 2)
/BD
Burnout downscale (Note 2)
2.2 Model and Suffix Codes
The following table shows the SDAU model and suffix codes.
Table 2.1 Model and Suffix Codes
Input Signal 2
Input Signal 1
Available Combination
Standard Specifications:
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
Common Options
Note 1: /VLT, and /CUR options can be combined with only –UN auxiliary c ode.
/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 selec table.
Note 4: Specify the option codes /TB and /A2 at th e same tim e.
<2. GENERAL>
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2.3 Accessory
Reference junction bracket : 1
(For SDAU-120-xx*R/NHR or SDAU-270-xx*R/NHR)
Alarm label : 1
Figure 2.2 Location of the Reference Junction Bracket
CAUTION
• Notice when replacing the internal unit of a conventional model:
When replacing the internal unit of a conventional model (SDAU-1xx-xx*E) with that of SDAU-
120-xx*R or SDAU-270-UN*R, a reference junction bracket (for connection to the RJC sensor)
needs to be installed (replaced).
For SDAU-120-xx*E
Replace a reference junction bracket (for connection to the RJC sensor).
For models other than SDAU-120-xx*E
Install a reference junction bracket (for connection to the RJC sensor).
<3. INSTALLATION>
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Alarm output 2
Alarm output 1
Failure output
1 to 5 V, mV, TC Input RTD Input
*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).
Terminal
Designation
Description
Excluding /RLY4, /VLT and /CUR
/RLY4 /VLT or /CUR
Alarm output 1
Retransmission output
1 to 5 V or 4 to 20 mA
Alarm output 2
Alarm output 1
Alarm output 4
Alarm output 2
Alarm output 3
Input 1
Input 2
Input 1
Input 2
A
C
F
B
D
H
J
K
1
3
5
2
4
6
7
8
A
B
C
D
F
H
J
K
NC
COM
NC,NO
COM
NC
COM
NO
NO
NC,NO
COM
NC,NO
COM
NC,NO
COM
COM
NC,NO
NC
COM
＋
－
NC
COM
NO
NO
1
2
3
4
5
6
7
8
＋
－
＋
－
A
B
B
A
B
B
(*1)
(*2)
(*2)
(*2)
(*2)
(*2)
Front view
may differ
according to
device.
3. INSTALLATION
For details of the installation procedure and wiring precautions, refer to the
instruction manual “Installation of Rack-Mounted Instruments” (IM 1B4F2-01E).
3.1 External Wiring
(a) All cable ends must be furnished with crimp-on type solderless lugs (for 4mm
screws).
(b) Draw out the internal unit from the rack case.
(c) Connect the cable to the correct terminals referring to Figure 3.1.
(d) Return the internal unit into the rack case after completing the wiring.
(e) Always return the terminal block cover to its original position after completing the
wiring.
CAUTION
The terminal block cover cannot be returned to its original position if the internal unit is not installed
correctly inside in the rack case. Securely return the terminal block cover because it also functions as
lock for the internal unit.
Figure 3.1 Terminal Layout and Terminal Wiring
<3. INSTALLATION>
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B＋
A－
COM
Figure 3.2 RS485 Communication Terminal Layout (/COM option)
Applicable Cables
(1) Signal circuit wiring
• Cross-sectional area of the cable conductor: 0.5 to 0.75 mm
• Examples of applicable cables: Single core PVC insulated flexible cable (VSF)
(2) Alarm circuit wiring
• Cross-sectional area of the cable conductor: 0.5 to 1.25 mm
• Examples of applicable cables: 600 V PVC insulated cable (IV) stranded wires (JIS
(3) Power supply wiring
• Cross-sectional area of the cable conductor: 1.25 to 2.00 mm
• Examples of applicable cables: 600 V PVC insulated cable (IV) stranded wires
2
stranded wires (JIS C 3306);
heat-resistant vinyl-insulated cable (UL style 1007)
2
C 3307);
PVC insulated cable for electric appliances (KIV)
stranded wires (JIS C 3316);
heat-resistant vinyl-insulated cable (UL style 1007)
2
(JIS C 3307)
<4. FUNCTIONS >
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4. FUNCTIONS
4.1 Operation Principle
Input signals are converted into digital data by an A/D converter circuit. This digital data
is signal processed (such as linearization or square root extraction) by a microprocessor
and then computed for alarm detection. Alarm relays are energized or de-energized
according to the alarm computation outputs.
For retransmission output, an input signal is pulse-width modulated after being signal
processed. It is then converted into 1 to 5 V DC or 4 to 20 mA DC signals via a photoisolation circuit.
4.1.1 Hardware Block Diagram
Figure 4.1 Hardware Block Diagram
<4. FUNCTIONS >
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/RLY4
Input 1
Input 2
Input
processing
PV1
Input
processing
PV2
Alarm detection processing
Alarm connection/output processing
Alarm
output 1
Alarm
output 2
Alarm
output 3
Alarm
output 4
Retransmission
output
Retransmission
output
processing
Failure output
Terminal
symbol name
Parameter
displayed
/VLT,/CUR
When /RLY4,/VLT,or
/CUR is not specified
Self-
diagnosis
Internal Function Block Diagram
The following shows the internal function block diagram. For more information, see the
Description of Each Function section.
Figure 4.2 Internal Function Block Diagram
<4. FUNCTIONS >
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4.2 Input Processing Function
Two input points are provided. The following processing is done with respect to each
input (see Figure 4.3). Encircled symbols are parameter symbols appearing on the
display setter. "n" takes value 1 or 2.
Figure 4.3 Input Processing Function Block Diagram
Description of Each Function:
• A/D conversion: Performs A/D conversion of input signals.
• Burnout (B.OUT): If an input signal is mV, thermocouple, or RTD input, the action to
be taken in case of burnout can be set. (This can be specified according to an
option code. Settings can be changed via a PC (VJ77) or the JHT200 Handy
Terminal after delivery.)
• Temperature unit conversion (UNITn): Allows temperature units (°C, K or °F) to be
set if an input signal is thermocouple or RTD input.
<4. FUNCTIONS >
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0.0 mV (RL1) 100.0 mV (RH1)
Default input range
0.0 (SCL1) 100.0 (SCH1)
Default scale
10.0 mV (RL1) 80.0 mV (RH1)
Measuring input range
1000 (SCL1) 20000 (SCH1)
Measuring scale
Decimal point position registered at DP1.
• Input range (RHn, RLn): An input range should be set if an input signal is mV or
temperature input. If an input value is -6.25% or less, or greater than 106.25% of the
input range, an input overrange occurs. For actions to be taken in the event of an
input overrange, see Section 8.2, "Actions under Fault Conditions."
• Square root extraction (SQRn, L.CUTn): If an input signal is 1 to 5 V DC, the
availability of square root extraction and a low-level cutoff point can be specified.
Specification of a low-level cutoff point is enabled only when square root extraction
is available. For inputs below the low-level cutoff point, no square root is extracted.
(Linear characteristics apply for any inputs below the low-level cutoff point.)
• Filter (Fn): This is a first-order lag filter. The time constant can be set in the range of
0.0 to 200.0 seconds. Note that for the actual time constant, a hardware filter time
constant of approx. 0.1 second will be added to the noted setting.
• Scaling (DPn, SCHn, SCLn): If an input signal is mV or 1 to 5 V DC, scaling can be
applied to a range specified by the input range (RHn, RLn). A value converted by
scaling (a value obtained by adding bias to this value if bias is used) becomes PVn.
The initial value of scaling is 0.0 to 100.0 (DPn=1, SCHn=100.0, SCLn=0.0).
<How to Set Input Range and Scaling>
The following is the example when input range of 10.0 to 80.0 mV is scaled to 1000 to
20000.
(1) Set the input range at the parameters RL1 and RH1.
(Example: RL1=10.0, RH1=80.0)
(2) Set the input decimal point position matched to the unit system actually in use at
DP1.
(Example: DP1=0)
(3) Set the scale range at the parameters SCH1 and SCL1.
(Example: SCL1=20000, SCH1=1000)
(Example)
Figure 4.4 Scaling
Note: Reverse scal ing (SCH1 < S CL1) is also possible.
The al arm unit will not operate normal ly when SCH1 is set to equal SCL1. Change the setting.
• Bias (BIASn):
A bias value can be added to scaling values.
This allows error to be compensated when there is an error between the input value
and the indicated value.
Bias can be set within the range ±10% [(SCH1 - SCL1) x 0.1] of the scaling width.
• PVn:
The value obtained by adding bias to the scaling value.
<4. FUNCTIONS >
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Alarm
detection 3
Alarm
detection 2
Alarm
detection 1
HYS1
HI alarm
LO alarm
1H
1L
MOD1
Deviation
(PV1-PV2)
Rate-ofchange
PV1
Rate-of-
change
PV2
MOD3
HI alarm LO alarm
3H
3L
Set parameter
PV1
PV2
PV1
PV2
MOD2
HI alarm
LO alarm
2H 2L
PV1
PV2
DV
PV1.VL
PV2.VL
AND
ALn_H
ALn_L
OR
Connected to
AL1_H and
AL1_L
TMn
ACTn
Output timer
RL
NCCOMNO
AN.OR.n
ALMn
Lamp
TM1
ACT1
AND
AL1_H
AL1_L
OR
Connected to
AL1_H and
AL1_L
Output timer
RL
NCCOMNO
AN.OR.1
ALM1
Lamp
Parameter to be displayed
VL1.TM
HYS2
VL2.TM
HYS3
VL3.TM
TM.M
TM.M
ON.TM1
OFF.TM1
ON.TMn
OFF.TMn
Same connections as
MOD1
Same connections as
MOD1
Alarm output n (n=2 to 4. Note that n=3 or 4 is for /RLY4 only.)
Alarm output 1
Connected to 1H, 1L,
2H, 2L, 3H, and 3L
Alarm1
connection
result
Alarm n
connection
result
Alarm-detecting sectionsAlarm connection/output sections
4.3 Alarm Processing Function
As shown in Figure 4.5, the SDAU's alarm function consists of the alarm-detecting
sections and alarm connection/output sections, each of which functions independent of
the others.
Figure 4.5 Alarm Processing Function Block Diagram
<4. FUNCTIONS >
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Low-limit alarm
provided
nL
nH
HYSn
HYSn
Input
High-limit alarm
provided
4.3.1 Alarm-Detecting Sections
There are three alarm-detecting sections, which set each of the following items (see
Figure 4.5). Those in parentheses show parameter symbols to be displayed on the
display setter. "n" takes value 1, 2, or 3.
• Input mode (MODn): Selects a target input at alarm detection-n from among input-1
absolute alarm, input-2 absolute alarm, deviation alarm (input 1 - input 2), input-1
rate-of-change alarm, and input-2 rate-of-change alarm.
If the same PVn rate-of-change alarm is set to the multiple MOD, the rate-of-change
of MODn having smaller n value is displayed in PVn.VL parameter.
For example, MOD1=MOD2=MOD3=4: Input 2 rate-of-change (PV2.VL), and
VL1.TM=10, VL2.TM=5, VL3.TM=3, PV2.VL displays PV2 rate-of-change for 10
seconds.
• Hysteresis (HYSn): Sets hysteresis at alarm detection-n in engineering units (range:
0 to 32000). (This is not applicable to rate-of-change alarms.)
• Rate-of-change alarm sampling time (VLn.TM): Available when the input mode is
set to rate-of-change alarm. A rate-of-change is obtained as follows:
Example: When MOD1 = PV1 rate-of-change alarm and VL1.TM = 10 sec. are set,
Rate-of-change = current value (present PV1 value) - previous value (PV1
value 10 sec. before)
• High-limit alarm setpoint (nH): Sets the high-limit setpoint at alarm detection-n in
engineering units (range: -19999 to 32000). High-limit alarm cannot be used as lowlimit alarm.
• Low-limit alarm setpoint (nL): Sets the low-limit setpoint at alarm detection-n in
engineering units (range: -19999 to 32000). Low-limit alarm cannot be used as highlimit alarm.
• Alarm detection repeatability: Same as input conversion accuracy
Figure 4.6 Alarm Action When Hysteresis is Set
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[°C]
[Sec.]
Alarm action
when n.H = +30°C
Normal
Normal
100
80
60
40
20
0
V
Ln.TM
+40°C
+30°C
-20°C
-40°C
+30°C
Alarm action
when n.L = -20°C
Normal Normal
Alarm
Alarm
Alarm
Figure 4.7 Action to be Taken When Input is Rate-of-change Alarm
4.3.2 Alarm Connection/Output Sections
There are two alarm connection/output sections (four for the /RLY4 option), which set
each of the following items (see Figure 4.5).
Those in parentheses show parameter symbols to be displayed in the display setter. "n"
takes value 1 or 2 (up to 4 for the option /RLY4).
• Alarm output connection (ALn_H, ALn_L): ALn_H specifies whether to connect the
high-limit alarm detection results of MOD1 to MOD3. ALn_L specifies whether to
connect the low-limit alarm detection results of MOD1 to MOD3.
• Alarm AND/OR specification (AN.OR.n): Specifies if the results of alarm output
connections are AND-connected or OR-connected.
• Alarm timer mode (TM.M): Selects the alarm timer mode. This is common to alarm
outputs 1 and 2 (or alarm outputs 1 to 4 for the /RLY4 option).
0: Alarm output timer (timer causing alarm output to delay: equivalent to SDAU*E)
1: ON/OFF delay timer (alarm dead time)
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TMn setpoint (sec.)
Alarm output resolution (sec.)
0 to 39
0.15
40 to 79
0.3
80 to 159
0.6
160 to 319
1.2
320 to 600
2.4
• Alarm output timer (TMn): Sets the alarm output delay for alarm n. The alarm unit
outputs an alarm when the time period set in TMn has elapsed after the connection
of alarm n resulted in an alarm status. Time can be specified in the range of 0 to 600
seconds (in 1 sec. intervals). However, a time lag of approx. 0.2 second will be
added to this setting as dead time to prevent erroneous alarm action.
Figure 4.8 shows an example of the alarm actions taken by ALM1 when the alarm
output timer is set so that alarms to be output to ALM1 are delayed by 15 seconds if
an alarm is detected for either the 90.0 (hysteresis: 10.0) high limit alarm setpoint of
PV1 or the 95.0 (hysteresis: 20.0) high limit alarm setpoint of PV2.
Figure 4.8 Alarm Output Actions to be Taken When Alarm Output Timer is Set
Moreover, if a timer setpoint is changed, alarm status becomes identical with the
alarm status of that time, causing the timer function to work from that time on. The
alarm output resolution is as shown in the following table according to the setpoint
of the alarm output timer.
For example, if an alarm status occurs for one second with the alarm output timer set at
600 sec., an alarm is output for 2.4 seconds, between 597.6 to 602.4 seconds later.
ALM1 and ALM2 can be HOT started, while ALM3 and ALM4 are always COLD started.
(For HOT/COLD starts, see Section 4.6, "Function of Recovery from Power Failure.")
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• Alarm-n ON delay timer (ON.TMn): Sets dead time after which the alarm turns ON.
If an input value is within an alarm range for a time set by ON.TMn, an alarm status
occurs. If the input returns to the normal range before the time set by ON.TMn
elapses, no alarm turns ON.
• Alarm-n OFF delay timer (OF.TMn): Sets dead time after which the alarm turns OFF.
If an input value is within a normal range for a time set by OF.TMn, a normal status
is brought about. If the input returns to an alarm range before the time set by
OF.TMn elapses, the alarm does not turn OFF.
Figure 4.9 shows an example of the alarm actions taken by ALM1 when the alarm n
OFF delay timer is set so that the dead time of alarms to be output to ALM1 is 10
seconds and the dead time before these alarms are canceled is 15 seconds if an
alarm is detected for either the 90.0 (hysteresis: 10.0) high limit alarm setpoint of
PV1 or the 95.0 (hysteresis: 20.0) high limit alarm setpoint of PV2.
Figure 4.9 Alarm Actions to be Taken When Alarm-n ON/OFF Delay Timers are Set
• Direction of relay action (ACTn): Specifies energized/de-energized status of a relay
in a condition where no alarm has occurred.
Energized at normal operation (ACTn=1)
A relay is energized when the alarm n detection result is in a normal state.
De-energized at normal operation (ACTn=0)
A relay is energized when the alarm n detection result is in an alarm state.
• RLYn TEST: Relay action test (exclusive to a PC (VJ77) or the JHT200 Handy
Terminal)
This is the relay action test function. It allows a relay to turn ON/OFF regardless of
the current alarm detection results. (Note: Make sure that your process is not
affected by the relay action test before using this function.)
One set of transfer contacts are provided for each output section. An alarm state can be
checked with the ALM lamp on the front panel of the alarm unit (which lights up if an
alarm occurs) and by checking the ALMn parameter displayed on the display setter.
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PV1
PV1 - PV2
PV2
AN.OR.1
AND
OR
AL1_H
AL1_L
TM1
ACT1
ALM1
AN.OR.2
AND
OR
AL2_H
AL2_L
TM2
ACT2
ALM2
MOD1
HYS1
1H=80
1L
MOD2
HYS2
2H=50
2L=40
MOD3
HYS3
3H=70
3L
PV1 rate-of-change
PV2 rate-of-change
4.3.3 Example of Setting the Alarm Functions
Example of Setting 1
Condition A)
ALM1: ALM1 alarm is output if all of the following are generated: the high high-limit
alarm of input 1 (1H = 80), the high-limit alarm of input 1 (3H = 70), and the
high-limit alarm of input 2 (2H = 50).
ALM2: ALM2 alarm is output if either the high-limit alarm (2H = 50) or low-limit alarm
(2L = 40) of input 2 is generated.
Figure 4.10 Alarm Connections for Condition A
Figure 4.11 Details of Parameter Settings
The parameter settings for condition A are as shown in the table above. When input 1
and input 2 are in the condition as shown in the figure above, the 2H and 3H parameters
enter the alarm state and only ALM2 outputs an alarm. (ALM1 outputs no alarm because
1H has not been in the alarm state.)
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mV input
Thermocouple input
RTD input
Span
10 to 100 mV DC
10 to 63 mV
elect romotive force)
50 to 500°C
Zero elevation
Three times the span
whichever is smaller
Three times the span or within ±25 mV,
Five t imes or less
4.4 Retransmission Output Function (for /VLT
and /CUR Options)
The SDAU digital alarm unit with the /VLT or /CUR option can output an input signal as
retransmission output in order to use it in a recorder, etc.
The retransmission output function is set using the following parameters.
For more information on each parameter, see Chapter 6, "PARAMETERS."
RET: Selects the retransmission output type (selectable from None, PV1, PV2, and
PV1 - PV2)
RTH: Maximum value of retransmission output scale
RTL: Minimum value of retransmission output scale
Retransmission Output Accuracy Guaranteed Range:
(RTH-RTL)
(RTL)
Note1: The retransmission output accuracy guaranteed range is within the noted accuracy range and within 0.0 to 100.0% of
the span (RTH - RTL ).
or within ±50 mV,
(converted based on thermo
whichever is smaller
the s pan
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PC
A maximum of 1,200 m ; up to 31 slave stations connected.
Programmable logic
controller (FA-M3, etc.)
or
4.5 Communication Function (for /COM Option)
The SDAU alarm unit can communicate with a device with an RS-485 communication
interface, allowing input values to be read out and/or parameters to be read out or
written in.
For more information, see YS80*R Rack-Mounted Instruments Communication
Functions User’s Manual (IM 01B04F01-20E).
- 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 : Twist pair cable with shield (Wire size: AWG24 or
equivalent.)
Figure 4.12 Connection with a PC
CAUTION
• RS-485 communication is not available when a PC (VJ77) or the Handy Terminal is connected to
the BRAIN connector on the front panel.
When using a PC (VJ77) or the Handy Terminal, connect a PC (VJ77) or the Handy Terminal after
removing the RS-485 connector so that a PC (VJ77) or the Handy Terminal connector can be
easily disconnected.
• Writing via RS-485 communication is not possible if the Parameter Write Protect jumper (W.P.) is
set to ON or the Communication Write Protect Setting parameter (COMMU) is set to “1: Protect”.
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H=75.0
POWER OFF
POWER ON
HYS=10%
10
seconds
POWER ON
Normal
When HOT start is set:
When COLD start is set:
Normal
Normal
Alarm
10
seconds10seconds
Parameter Symbol
Setpoint
H (alarm setpoint nH)
75.0%
HYS (hysteresis)
10.0%
TM ( alarm output timer)
30 seconds
4.6 Function of Recovery from Power Failure
The SDAU alarm unit's recovery from power failure function operates as described
below, depending on the setting of the HOT start/COLD start parameter.
HOT start: Continues operation from the alarm status just before a power failure.
Note1: W hen t he alarm t im er m ode is set to alarm output tim er, ALM3 and ALM4 cann ot be HOT started.
Note2: HOT start s also cannot be m ade for rate-of-change alarm s. F or these alarm s, the S DAU judges if an alarm has
COLD start: Starts operation by assuming that power-on input has been continued
(provided that hysteresis has not been activated).
The following shows differences in alarm actions between HOT and COLD setpoints.
occurred at the instant when the change time of a rate-of-change alarm has elapsed, by regarding the value at
recovery from pow er failure as the previous value.
Figure 4.13 Alarm Action for HOT and COLD Starts
Parameter Setting Conditions for the Conditions in the Figure Above
Note: Even when the HOT start parameter is set, if a power failure occurs during any of
the following procedures, a HOT start is not possible.
• During input adjustment
• While a parameter is being changed (with a key switch, a PC (VJ77), JHT200
Handy Terminal, or through RS-485 communication)
• During initial setting at power ON
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ALM
2 E F
Lower half section of
the digital display
Fail (F) lamp
Error (E) lamp
4.7 Self-Diagnostic Function
The SDAU alarm unit has a self-diagnostic function capable of detecting a failure or
error in the unit itself.
If an error/failure is detected, notification is made by the following means: an error
indication appears on the lower half of the digital display, a parameter is displayed on
the upper half of it, a lamp on the front panel of the alarm unit is lit, the failure output
contact is de-energized (when /RLY4, /CUR, or /VLT is not specified), and/or an alarm
output contact is activated.
For details about the lamps on the front panel of an alarm unit with the /RLY4 option, see
Section 5.2, “Part Names of the Display Setter.”
The following describes actions to be taken in the event of error. (For more information,
see Section 8.2, "Actions under Fault Conditions.")
• Lighting of F lamp: CPU failure, A/D conversion failure, EEPROM failure, or RJC
error
(When the /RLY4 option is specified, this lamp is an indicator for ALM4.)
• Lighting of E lamp: Input signal overrange (Note)
(This lamp lights up if the input is more than 106.25% or less than -6.25% of the
input range high limit (RH1) or the input range low limit (RL1).)
Input burnout (Note)
HOT start is disabled (see Section 4.6, "Function of Recovery from Power Failure").
(When the /RLY4 option is specified, this lamp is an indicator for ALM3.)
Note: For input signal overrange or input burnout, the E lamp lights up and a failure output is sent out when the target input
signal is connected to an alarm output section.
• Failure output: (only when /CUR, /VLT, or /RLY4 option is not specified)
A failure contact output is provided if the F lamp comes on or the power supply fails.
Using the point-of-error failure output action parameter (front display parameter:
FAIL.M; BRAIN communication parameter: F40:FAIL MODE), define the action of
the failure contact to be taken when the E lamp comes on.
ON (0) = Provides a failure contact output when the E lamp comes on.
OFF (1) = Provides no failure contact output when the E lamp comes on.
(This parameter defaults to ON (0), as with SDAU*E.)
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