MSA SUPREMA Touch Installation and operating instructions

Installation & Maintenance Instructions
SUPREMATouch
Fire and Gas Warning Unit
Reading
Tel: [phone] | Email: [e-mail]
Aberdeen
Tel: [phone] | Email: [e-mail]
Registered Address
ABLE Instruments & Controls Ltd
Cutbush Park, Danehill, Lower Earley,
Reading, Berkshire, RG6 4UT. UK.
Web
able.co.uk
E-commerce
247able.com

Manual
SUPREMATouch
Fire and Gas Warning Unit
Order No. 10126972/00

WARNING
THIS MANUAL MUST BE CAREFULLY READ BY ALL INDIVIDUALS WHO HAVE OR WILL
HAVE THE RESPONSIBILITY FOR USING OR SERVICING THE PRODUCT. Like any piece
of complex equipment, this instrument will perform as designed only if it is used and serviced
in accordance with the manufacturer’s instructions. OTHERWISE, IT COULD FAIL TO
PERFORM AS DESIGNED AND PERSONS WHO RELY ON THIS PRODUCT FOR THEIR
SAFETY COULD SUSTAIN SEVERE PERSONAL INJURY OR DEATH.
The warranties made by Mine Safety Appliances Company with respect to the product are
voided if the product is not used and serviced in accordance with the instructions in this
manual. Please protect yourself and others by following them. We encourage our customers
to write or call regarding this equipment prior to use or for any additional information
relative to use or repairs..
© MINE SAFETY APPLIANCES COMPANY 2012 - All Rights Reserved
This manual is available on the Internet at: www.msasafety.com
Manufactured by
MSA NORTH AMERICA
1000 Cranberry Woods Drive, Cranberry Township, PA 16066

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Contents
1 Safety Regulations .................................................................................................................... 9
1.1 Correct Use ....................................................................................................................... 9
1.2 Product Warranty............................................................................................................. 10
1.3 Sensors Which Can Be Connected to the Unit................................................................ 11
1.4 Software Status............................................................................................................... 12
2 System Concept ....................................................................................................................... 13
2.1 Features of the System ................................................................................................... 13
2.2 Construction of the Unit................................................................................................... 15
2.3 Safety Concept ............................................................................................................... 17
3 Operation of the System ......................................................................................................... 18
3.1 Operation......................................................................................................................... 18
3.2 Operation and Display unit MDO..................................................................................... 18
3.3 Operation Menu .............................................................................................................. 23
3.4 PC Operation................................................................................................................... 70
4 Special conditions to comply with the requirements of IEC 61508 ................................... 71
4.1 Conditions for configuration, installation, operation and maintenance............................ 71
4.2 Listing of the permitted Hardware Modules and Software Versions................................ 76
4.3 TUEV-Certificate.............................................................................................................. 79
5 Modules tested according to DMT 03 ATEX G 003 X ........................................................... 80
6 Maintenance and Service ....................................................................................................... 81
6.1 Maintenance and Adjustment ......................................................................................... 81
6.2 Sensor Simulation Modules............................................................................................. 86
6.3 Replacement of Sensors................................................................................................. 88
6.4 Replacement of Modules................................................................................................. 89
6.5 Changing the Password .................................................................................................. 91
6.6 Plug-In Modules– Status LED ......................................................................................... 92
6.7 Diagnostic Functions....................................................................................................... 93
6.8 System Failure Messages............................................................................................... 97
6.9 ID Rack Assignment in decimal and hexadecimal figures............................................... 99
6.10 Display of Digital Messages .......................................................................................... 100
6.11 LED and Sounder Test.................................................................................................. 100
6.12 Instructions for system configuration............................................................................. 101
7 System Expansions .............................................................................................................. 105
7.1 Connection of Additional Sensors ................................................................................. 105
7.2 Connection of Additional Relay Driver Outputs............................................................. 106
7.3 Connection of Additional Analogue Outputs.................................................................. 107

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8 Ordering Information .............................................................................................................109
8.1 Modules and Accessories.............................................................................................. 109
9 Description of the System ....................................................................................................113
9.1 Structure of the System (module descriptions) ............................................................. 113
9.2 Expansion Stages ......................................................................................................... 114
9.3 System Design Variants ............................................................................................... 115
9.4 Bus Protocol ................................................................................................................. 115
9.5 Descriptions of the Modules ......................................................................................... 115
9.6 System Power Supply ................................................................................................... 126
10 Installation .............................................................................................................................. 129
10.1 General Information....................................................................................................... 129
10.2 Installation, Step by Step............................................................................................... 132
10.3 Module Configuration..................................................................................................... 136
10.4 System Configuration (Hardware) ................................................................................. 159
10.5 Systems Consisting of Several Racks........................................................................... 164
10.6 Connection of the Sensors ............................................................................................ 181
10.7 Connection of the Relay Outputs................................................................................... 186
10.8 Connection of the Switching Outputs............................................................................. 195
10.9 Connection of the Analog Outputs................................................................................. 199
10.10 System Ports (MST Module).......................................................................................... 201
10.11 Connection for the System Power Supply..................................................................... 205
10.12 Labelling Concept.......................................................................................................... 208
11 Startup ................................................................................................................................... 212
11.1 Turn On the Supply Voltage .......................................................................................... 212
11.2 System Configuration .................................................................................................... 213
11.3 Configure the Relay Driver Outputs (Switching Outputs) .............................................. 220
11.4 First Calibration.............................................................................................................. 223
11.5 Completing Startup........................................................................................................ 224
12 Connection of Peripherals ...................................................................................................225
12.1 Connection of a PC/Laptop............................................................................................ 225
12.2 Protocol Printer.............................................................................................................. 227
12.3 Bus Connection ............................................................................................................. 228
13 Redundant Systems .............................................................................................................233
13.1 Application/Function Safety........................................................................................... 233
13.2 Function of Redundant Systems.................................................................................... 234
13.3 Design of the Redundant System.................................................................................. 236
13.4 Startup........................................................................................................................... 241

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14 Technical Data ...................................................................................................................... 243
14.1 System Data.................................................................................................................. 243
14.2 Module Data.................................................................................................................. 244
15 SUPREMA Sensor Data Sheets ........................................................................................... 260
15.1 SUPREMA Sensor Data Sheet Contact........................................................................ 260
15.2 SUPREMA Sensor Data Sheet Fire Detector Apollo
Series 65 (not explosion-proof) Internal Power Supply
(without safety barrier).................................................................................................... 262
15.3 SUPREMA Sensor Data Sheet Fire Detector Apollo
Series 65 (not explosion-proof) External Power Supply
(without safety barrier).................................................................................................... 264
15.4 SUPREMA Sensor Data Sheet for Push-Button Detector
(not explosion-proof) Internal Power Supply
(without safety barrier).................................................................................................... 266
15.5 SUPREMA Sensor Data Sheet for Push-Button Detector
(not explosion-proof) External Power Supply
(without safety barrier)................................................................................................... 268
15.6 SUPREMA Sensor Data Sheet Explosion-proof
Push-Button Detector with Barrier Z 787....................................................................... 270
15.7 SUPREMA Sensor Data Sheet Ex-Fire Detector
Apollo Series 60 with Barrier Z 787............................................................................... 273
15.8 SUPREMA Sensor Data Sheet Explosions-Proof Fire Detector
CERBERUS DO1101EX/DT1101EX with Barrier Z 787 ............................................... 276
15.9 SUPREMA Sensor Data Sheet Explosion-Proof Push-Button
Detector with Barriers MTL 728 and MTL 710............................................................... 279
15.10 SUPREMA Sensor Data Sheet Explosion-Proof Fire Detector
Apollo Series 60 with Barriers MTL 728 and MTL 710pressure-resistant.................... 282
15.11 SUPREMA Sensor Data Sheet Explosion-Proof Fire Detector
CERBERUS DO1101EX/DT1101EX with Barriers MTL 728 and MTL 710 .................. 285
15.12 SUPREMA Sensor Data Sheet Contact........................................................................ 288
15.13 SUPREMA Sensor Data Sheet Series 47K-HT (3-wire)................................................ 290
15.14 SUPREMA Sensor Data Sheet Series 47K-HT (5-wire)................................................ 293
15.15 SUPREMA Sensor Data Sheet 4-20 mA [2-wire].......................................................... 296
15.16 SUPREMA Sensor Data Sheet 4-20 mA [3-wire].......................................................... 298
15.17 SUPREMA Sensor Data Sheet 4-20 mA with ext. power supply .................................. 300
16 Dimensions ........................................................................................................................... 302
16.1 Rack .............................................................................................................................. 302
Rail-mounted Modules 303

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User Instruction Manual
SUPREMATouch
Fire and Gas Warning Unit

Mine Safety Appliances Company
1000 Cranberry Woods Drive
Cranberry Township, PA 16066
USA
© MSA AUER GmbH. All rights reserved

MSA AUER
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Safety Regulations
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1 Safety Regulations
1.1 Correct Use
The SUPREMATouch is a stationary gas warning system with multiple measurement sites, which
operates continuously to monitor work sites for the presence of combustible, explosive, and toxic
mixtures of gas and/or vapour with air and to monitor the ambient air for oxygen content. The sys-
tem supplies power to the sensors, displays the measured concentrations, and monitors the limit
values, but it also actuates alarm devices. The various functions of the gas warning system [the
acquisition of the measurement values, the evaluation of the signals, the actuation of the alarm
devices etc.] are performed by the various modules of the SUPREMATouch.
The SUPREMATouch can process the standardised current and voltage outputs of various types
of sensors. This means that the system can display and evaluate not only gas measurements but
other measurement variables as well [e.g., temperature and pressure].
Typical areas where the SUPREMATouch can be used include:
-The chemical and petrochemical industry
-The paint and solvent-processing industry
-The gas-processing industry
-The steel-processing industry
-Municipal areas
ATTENTION: The SUPREMATouch is intended for Indoor use only.
Monitoring Functions
Monitoring functions are called for in the following areas:
-Production
-Warehousing
-Distribution
-Shipping
-Processing of gases and vapours
Explosion Monitoring for Protecting Industrial Plants and Workers
Continuousmonitoringoftheatmosphereto detectformationofexplosivegas/vapour-airmixtures
and to give early warning, long before the lower explosion limit is reached [LEL].
Toxicity Monitoring for Protecting Workers
Continuous monitoring of the atmosphere to detect formation of toxic gas concentrations. Early
warning prior to or on reaching the limit values.
Oxygen Monitoring for Protecting Workers
Continuous monitoring of the atmosphere to detect oxygen enrichment or deficiency. Early warn-
ing prior to or on reaching the limit values.

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Safety Regulations MSA
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Oxygen Monitoring for Protecting Industrial Plants
Continuous monitoring of inerted atmospheres to detect presence of oxygen. Early warning prior
to or on reaching the limit values.
It is imperative that this operating manual be read and observed when using the product. In par-
ticular, the safety instructions, as well as the information for the use and operation of the product,
must be carefully read and observed. Furthermore, the national regulations applicable in the us-
er's country must be taken into account for a safe use.
Alternative use, or use outside this specification will be considered as non-compliance. This also
applies especially to unauthorised alterations to the product and to commissioning work that has
not been carried out by MSA or authorised persons.
1.2 Product Warranty
(1) Warranty- Seller warrants that this product will be freefrom mechanical defector faulty work-
manship for a period of 18 months from date of shipment, or one year from installation,
whichever occurs first, provided it is maintained and used in accordance with Seller's instruc-
tions and/or recommendations. This warranty does not apply to expendable or consumable
parts whose normal life expectancy is less than one year such as, but not limited to, nonre-
chargeablebatteries,filament units, filter, lamps, fuses etc. The Seller shall be released from
all obligations under this warranty in the event repairs or modifications are made by persons
other than its own or authorized service personnel or if the warranty claim results from phys-
ical abuse or misuse of the product. No agent, employee or representative of the Seller has
any authority to bind the Sellerto any affirmation, representation or warranty concerning the
goods sold under this contract. Seller makes no warranty concerning components or acces-
sories not manufactured by the Seller, but will pass on to the Purchaser all warranties of
manufacturers of such components. THIS WARRANTY IS IN LIEU OF ALL OTHER WAR-
RANTIES, EXPRESSED, IMPLIED OR STATUTORY, AND IS STRICTLY LIMITED TO
THE TERMS HEREOF. SELLER SPECIFICALLY DISCLAIMS ANY WARRANTY OF
MERCHANT ABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE.
(2) Exclusive Remedy- It is expressly agreed that Purchaser's sole and exclusive remedy for
breach of the above warranty, for any tortious conduct of Seller, or for any other cause of
action, shall be the repair and/or replacement at Seller's option, of any equipment or parts
thereof,which afterexamination by Selleris proven to bedefective.Replacementequipment
and/or parts will be provided at no cost to Purchaser, F.O.B. Seller's Plant. Failure of Seller
to successfully repair any non-conforming product shall not cause the remedy established
hereby to fail of its essential purpose.
(3) Exclusion of Consequential Damage- Purchaser specifically understands and agrees that
under no circumstances will seller be liable to purchaser for economic, special, incidental or
consequential damages or losses of any kind whatsoever, including but not limited to, loss
of anticipated profits and any other loss caused by reason of non-operation of the goods.
WARNING
This product is supporting life and health. Inappropriate use, maintenance or servicing may af-
fect the function of the device and thereby seriously compromise the user's life.
Before use the product operability must be verified. The product must not be used if the function
test is unsuccessful, it is damaged, a competent servicing/maintenance has not been made,
genuine MSA spare parts have not been used.

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Safety Regulations
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This exclusion is applicable to claims for breach of warranty, tortious conduct or any other
cause of action against seller.
1.3 Sensors Which Can Be Connected to the Unit
The following types of active and passive MSA sensors can be connected to the
SUPREMATouch system:
[EX:Explosivegases orvapours; TOX:Toxic gases; OX:Oxygen;FireDetection: SmolderingFire
Detection; Flame: Flame Detector]
NOTE: Other types of sensors may be operated in conjunction with the SUPREMATouch only af-
ter consulting with MSA.
Designation Module
Type Measuring Principle Use Active Passive
Series 47K MPI-
WT100 catalytic EX X
Ultima X MCI various EX X
FlameGard MCI infrared Flame X
PrimaX MCI various EX/TOX/OX X
PrimaXIR MCI infrared EX X
FlameGard 5 MSIR MCI infrared Flame X
FlameGard 5 UV/IR MCI infrared/ultraviolet Flame X
FlameGard 5 UV/IR-E MCI infrared/ultraviolet Flame X
Ultima MOS-5 MCI semiconductor H2SX
Ultima MOS-5E MCI semiconductor H2SX
Ultima OPIR-5 MCI infrared EX X
UltraSonic EX-5 MCI acoustic leakage X
UltraSonic IS-5 MCI acoustic leakage X
MAC MFI
Smoke MFI
Fire MFI
Switch MSI

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1.4 Software Status
The operation manual refers to the following software status:
Software status ATEX and TÜV SIL 3
Module Software version
Flash resp. EPROM
Software version
CPLD
MCP 20 3.01.02 —
MDO 20 3.01.02 —
MDA 20 2.01.02 —
MAO 10 2.02.01 MAO MA01
MGO 20 3.01.02 —
MAI 20 MAI EA03 MAI MA01
MAR 10 — MAI MA01

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System Concept
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2 System Concept
2.1 Features of the System
-Modular system.
-Compact construction.
-High flexibility.
-19” rack system for the connection of up to 256 sensors.
-NEMA 4 wall mount cabinet
-Complete system for up to 64 sensors with common alarm in one 19” rack.
-Maximum number of switching outputs in the system: 512.
-Minimal installation work [bus system].
-Redundancy possible
-Maximum refresh rate of 3-4 seconds for alarm outputs [1-2 s for data acquisition; 1 s for com-
putation; 1 s for data output]
-Maximum refresh rate of 3-5 seconds for signal fail outputs [1-2 s for data acquisition;1-2 s for
computation; 1 s for data output]
-Maximum response time of 15 seconds for system fails
-External voltage operation [85 ... 265 VAC] no switching necessary.
-Power supply unit on the rack, 150 W.
-For higher power requirements, external power supplies can be connected.
-Battery connection for emergency power operation.
-Operating voltage range of the system modules: 19.2 VDC ... 32 VDC.
Recommended voltage: 24 VDC.
-Card coding is no longer necessary.
-Operation of active sensors with 4 ... 20 mA output, 2- or 3-wire.
-System operation via a graphical touch screen with a resolution of 320 x 240 pixels and indi-
vidual function keys.

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-Self-explanatory error messages
-System operation optionally via laptop [Windows user interface].
-PC can be connected to tie the system into the company communications network [data eval-
uation, data display, etc.]
-Key switch connection or 3-level password for access control.
-Key switch connection for relay inhibiting.
-Common alarm LEDs for 1st to 4th alarm, signal failure [sensor], horn, inhibit, power supply
failure.
-Protocol printout of status changes + system operations [standard ASCII, 80 CHR].
-1 x USB + 1 x RS232 or 2 x RS 232 interfaces for data transfer to an industrial PC/laptop/print-
er.
-RS 232 interfaces are electrically isolated.
-RS 232/RS 485 converters used for longer transmission distances.
-The 8 MRO Module common alarm relays supplied by the rack power supply unit.
-External relays are supplied with power separately.

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System Concept
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2.2 Construction of the Unit
The modules of the SUPREMATouch are mounted in a rack. For expanded systems, additional
modules can be placed in a second rack or installed on top hat rails in a switch box. Data is ex-
changed between the modules over a CAN bus, which makes it possible to transmit data over dis-
tances of up to 1,000 m. For measurement tasks that require redundant signal input and
processing, additional modules can be added at any time to expand the gas warning system.
The installation site of the modules must be outside hazard areas 0, 1, and 2 and be free of ignit-
able, explosive, or corrosive gases.
The sensors must have the type of protection against ignition prescribed for the installation site.
The connection between the input module of the SUPREMATouch and the sensors is established
by a shielded remote-measurement cable of the 2, 3, 4 or 5 wire type.
For servicing, the sensors can be electrically isolated from the SUPREMATouch by mechanically
disconnecting the plug-in connection [MAT, MAT TS modules].
The following block circuit diagram shows the possible layout of a non-redundant system.

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System Concept MSA
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Fig. 1 Block circuit diagram of a system layout [non-redundant]
5 x
MRO10 8 TS
5 x
MRO10 8 TS
5 x
MRO10 8 TS
5 x
MRO10 8 TS
MIB 20
85VAC...265VAC
Output 4-20mA
Ext Int = MSP Bat
40
5 passive
3 passive
2 active
3 active
24V power supply
system failure relay
power rack
JWS150/24
2 passive
2 active
CAN A
Term i n a t o r
CANA
Termi n a t o r
CANA
CAN A CAN B
MCP 20
24 V
MDA 20
CAN
24 V
SPI-Bus
MAI20
MAT 10
DFK DFK DFK DFK fire/smoke
detector
manual call
point DFK
MAT 10 TS
MUT10
40
40
3
24V=
ล
24V=
ล
BAT
24V=
MGO 20
24 V, 500 mA
40 Drivers
1
40
CAN
24 V
MUT10
40
MRC10
40
5 x
MRO10 8 TS
MAO 10
1
8
CAN
24 V
MUT10
40
MGT40
-TS
40 Gateway
CAN
24 V
Modbus RTU, Modbus TCP, Profibus DP
24 V
CAN
CAN
CAN bridge CAN/fibre optic
24 V
CAN
24 V
40
MGO 20
24 V, 500 mA
40 Drivers
1
40
CAN
24 V
First MRO10 8
group signal fault horn relays inhibit relays powerfail relays
1. group alarm 2. group alarm 3. group alarm 4. group alarm
24 V
Lock A/B
Reset
Acknowledge
Passwordswitch
MST 10
2 x CANA, CANB2 x
RS 232 A = PC RS 232 B = printer
2 x RS 232
ACK
MDO 20
2. ALARM 1. ALARM
SIGNAL FAILURE
3. ALARM 4. ALARM
CAN A CAN B
RES
POWER INHIBITSYSTEM
24 V
MDC 20

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2.3 Safety Concept
The individual functional modules are connected to each other by a CAN bus. The CAN bus is
designed to be virtually error-proof. Every module can detect errors on the bus and handle them
appropriately. The probability of an undiscovered communications error on the bus is 4.7 * 10-14.
Error statuses on the CAN bus are indicated on the DISPLAY + OPERATION unit [MDO module].
Each module with a microcomputer module has a watchdog timer, which actuates a “wired” OR
signal line if the module fails. As a result, the SYSTEM FAILURE common relays on the intercon-
nection board [MIB module] are deactivated. This common failure signal is monitored by the DIS-
PLAY + OPERATION unit .
All the modules are checked for signs of life at fixed, periodic time intervals by the CENTRAL
PROCESSING unit [MCP module] via the CAN bus. The failure of a module can thus be recog-
nised, and the appropriate messages will be generated. These messages are displayed on the
MDO module and, parallel to it, the System Failure is activated by the relevant modules.
The operating voltages of the connected voltage supply units [EXT, INT and BAT] are monitored
by special inputs of the DATA ACQUISITION unit [MDA module]. If a malfunction occurs here, the
POWER-FAIL common relay is released.
For gas warning systems with higher safety requirements according to IEC 61508 SIL 3 the sys-
tem can be provided with redundancy by the use of additional modules. Redundant signal
processing has the same structure and functions the same way as standard non-redundant
processing. Communications between the modules proceed over an internal connection, which is
designed as a redundant CAN bus. If one of the two signal processing routes malfunctions, an
error message to this effect appears on the DISPLAY + OPERATION unit [MDO module] [SYS-
TEM FAIL]. The remaining signal processing channel takes over all of the necessary functions un-
til the defective module can be replaced. The failure of individual modules does not lead
automaticallyto thefailure ofthe entire system.Only the functions assigned to thespecific module
in question are not available.
In the simpler expansion stages of the safety requirements according toIEC 61508, the gas warn-
ing system can be operated via one of the two possible CAN bus connections. Starting with SIL 3,
both CAN bus connections are generally required. In this case, two CENTRAL PROCESSING
units [MCP modules] are present and all of the input and output signals important for system op-
erations are available over additional modules on both CAN buses in parallel. If one of these CAN
bus connections fails, an error signal is generated by the SYSTEM FAIL message. The system
still remains functional by using the remaining CAN bus connection.
The message SYSTEM FAIL is leading to flash up the SYSTEM FAIL LED and the system failure
relays change to the failure condition. A permanent lasting System Fail message indicates an ur-
gent need of service [for example the malfunction of a module]. Therefore the connection of the
switching outputs of the system failure relays has to enable an immediate triggering message.

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3 Operation of the System
3.1 Operation
General
The modular control system’s user interface is the integrated operation and display unit . This unit
displays alarms and warnings as well as system parameters. Connecting the operating unit to a
PC permits a more user friendly operator interface with additional features.
Both the PC program and the SUPREMATouch system use window based operating platforms.
The input fields areset up as selection fields as muchas possible, with all knowninputs displayed.
Selection and input are touch-controlled, which makes use of the integratedoperation and display
unit easy.
3.2 Operation and Display unit MDO
General
The operation and display unit includes the following components:
-Colour TFT touch screen with 320 x 240 resolution
-2 keys
-8 LED indicators
-1 beeper
The TFT screen is a full graphic display with a resistive touch panel. The character height is ap-
proximately 4 mm.
Fig. 2 Display and Operation Module [MDO]
NOTE: To prevent damage to the touch screen, avoid touching it with sharp objects. Only use fin-
gers or the touch screen pen provided.
CAUTION
When measuring combustible gas high off-scale readings may indicate an explosive concentra-
tion.

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Operation of the System
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LED Indicators and Alarms
The 8 LED indicators provide system and signal status information.
SYSTEM:
SIGNAL:
Alarms can be latching or non-latching [also see Measure Points].
Non-latching alarms:
When a signal exceeds the alarm threshold a new alarm is triggered and the corresponding LED
flashes at a frequency of 0.5 Hz. Pressing the ACKNL [acknowledge] key makes the LED change
to ‘steady state’. When the signal is below the alarm threshold, the LED will turn off, regardless of
whether the alarm has been acknowledged or not. For non-latching alarms, the RESET key has
no effect.
Latching alarms:
When a signal exceeds the alarm threshold a new alarm is triggered and the corresponding LED
flashes at a frequency of 0.5 Hz. Pressing the ACKNL [acknowledge] key makes the LED change
to ‘steady state’. When the signal is no longer exceeding the alarm threshold, the LED remains
in ‘steady state’ if the alarm has been acknowledged, or in the ‘flashing state’ if the alarm has not
been acknowledged. If the signal is no longer exceeding the alarm threshold and the alarm has
been acknowledged, the LED is extinguished by pressing the RESET key. If the signal still ex-
ceeds the alarm threshold, pressing RESET has no effect.
Signals that are above full-scalerange or signal failures that were caused by an interruption of the
digital communication are always latched. Signals below the measurement range are non-latch-
ing. Measurement values that are over the full-scale range will trigger all 4 alarms.
If an audible alarm device is connected to the horn relay, it will sound as soon as a new alarm is
triggered. It continues to sound even when the alarm condition no longer exists. Pressing the
ACKNL key silences the horn, regardless of whether or not the alarm condition still exists.
-POWER [green] power supply on/off
-FAIL [yellow] system specific error [e.g. defective CPU]
-INHIBIT [yellow]
on: inputs are inhibited or a calibration is pending
blinking: outputs connected to one or more inputs are locked
-AL 1–AL 4 [red] input signal alarms
[each input can have up to four alarms]
-FAIL [yellow] specific input signal statuses
[measurement values that are over full-scale, below the measure-
ment range and signal failures]
When a redundant system is used, the RESET or ACKNL key has to be pressed for at
least 1 second.