WAGO 750-481/003-000 User manual

Fieldbus Independent
I/O Modules
2 AI RTD EEx i
750-481/003-000
Manual
Version 1.0.3

ii • General
WAGO-I/O-SYSTEM 750
I/O Modules
Copyright 2007 by WAGO Kontakttechnik GmbH & Co. KG
All rights reserved.
WAGO Kontakttechnik GmbH & Co. KG
Hansastraße 27
D-32423 Minden
Phone: [phone] – 0
Fax: [phone] – 1 69
E-Mail: [email protected]
Web: http://www.wago.com
Technical Support
Phone: [phone] – 5 55
Fax: [phone] – 85 55
E-Mail: [email protected]
Every conceivable measure has been taken to ensure the correctness and com-
pleteness of this documentation. However, as errors can never be fully ex-
cluded, we would appreciate any information or ideas at any time.
E-Mail: [email protected]
We wish to point out that the software and hardware terms as well as the
trademarks of companies used and/or mentioned in the present manual are
generally trademark or patent protected.

Content • iii
WAGO-I/O-SYSTEM 750
I/O Modules
CONTENT
1Important Comments .................................................................................4
1.1 Legal Principles........................................................................................4
1.1.1 Copyright ............................................................................................. 4
1.1.2 Personnel Qualification ....................................................................... 4
1.1.3 Intended Use ........................................................................................ 4
1.2 Symbols .................................................................................................... 5
1.3 Number Notation...................................................................................... 5
1.4 Safety Notes ............................................................................................. 6
1.5 Scope ........................................................................................................ 6
2I/O Modules .................................................................................................7
2.1 Analog Input Modules.............................................................................. 7
2.1.1 750-481/003-000 [2 AI RTD EEx i].................................................... 7
2.1.1.1 View................................................................................................ 7
2.1.1.2 Description...................................................................................... 7
2.1.1.3 Display Elements ............................................................................ 9
2.1.1.4 Schematic Diagram....................................................................... 10
2.1.1.5 Technical Data .............................................................................. 11
2.1.1.6 Process Image ...............................................................................13
2.1.1.6.1 Configuration for Pt Resistance Sensors.................................. 13
2.1.1.6.2 Configuration for Ni Resistance Sensors ................................. 14
2.1.1.6.3 Configuration for Resistance Measuring .................................16
2.1.1.6.4 Configuration for Potentiometer Measuring ............................ 17
2.1.1.7 Configuration with WAGO-I/O-CHECK 2 .................................. 18
3Use in Hazardous Environments .............................................................20
3.1 Foreword ................................................................................................ 20
3.2 Protective measures................................................................................ 20
3.3 Classification meeting CENELEC and IEC........................................... 20
3.3.1 Divisions............................................................................................ 20
3.3.2 Explosion protection group ...............................................................21
3.3.3 Unit categories................................................................................... 22
3.3.4 Temperature classes........................................................................... 22
3.3.5 Types of ignition protection ..............................................................23
3.4 Classifications meeting the NEC 500..................................................... 24
3.4.1 Divisions............................................................................................ 24
3.4.2 Explosion protection groups.............................................................. 24
3.4.3 Temperature classes........................................................................... 25
3.5 Identification .......................................................................................... 26
3.5.1 For Europe ......................................................................................... 26
3.5.2 For America ....................................................................................... 27
3.6 Installation regulations ........................................................................... 28

4 • Important Comments
Legal Principles
WAGO-I/O-SYSTEM 750
I/O Modules
1 Important Comments
To ensure fast installation and start-up of the units described in this manual,
we strongly recommend that the following information and explanations are
carefully read and abided by.
1.1 Legal Principles
1.1.1 Copyright
This manual is copyrighted, together with all figures and illustrations
contained therein. Any use of this manual which infringes the copyright
provisions stipulated herein, is not permitted. Reproduction, translation and
electronic and photo-technical archiving and amendments require the written
consent of WAGO Kontakttechnik GmbH & Co. KG. Non-observance will
entail the right of claims for damages.
WAGO Kontakttechnik GmbH & Co. KG reserves the right to perform
modifications allowed by technical progress. In case of grant of a patent or
legal protection of utility patents all rights are reserved by WAGO
Kontakttechnik GmbH & Co. KG. Products of other manufacturers are always
named without referring to patent rights. The existence of such rights can
therefore not be ruled out.
1.1.2 Personnel Qualification
The use of the product detailed in this manual is exclusively geared to
specialists having qualifications in PLC programming, electrical specialists or
persons instructed by electrical specialists who are also familiar with the valid
standards. WAGO Kontakttechnik GmbH & Co. KG declines all liability
resulting from improper action and damage to WAGO products and third party
products due to non-observance of the information contained in this manual.
1.1.3 Intended Use
For each individual application, the components supplied are to work with a
dedicated hardware and software configuration. Modifications are only
permitted within the framework of the possibilities documented in the
manuals. All other changes to the hardware and/or software and the non-
conforming use of the components entail the exclusion of liability on part of
WAGO Kontakttechnik GmbH & Co. KG.
Please direct any requirements pertaining to a modified and/or new hardware
or software configuration directly to WAGO Kontakttechnik GmbH & Co.
KG.

Important Comments • 5
Intended Use
WAGO-I/O-SYSTEM 750
I/O Modules
1.2 Symbols
Danger
Always abide by this information to protect persons from injury.
Warning
Always abide by this information to prevent damage to the device.
Attention
Marginal conditions must always be observed to ensure smooth operation.
ESD (Electrostatic Discharge)
Warning of damage to the components by electrostatic discharge. Observe
the precautionary measure for handling components at risk.
Note
Routines or advice for efficient use of the device and software optimization.
More information
References on additional literature, manuals, data sheets and INTERNET
pages
1.3 Number Notation
Number Code Example Note
Decimal 100 normal notation
Hexadecimal 0x64 C notation
Binary '100'
'0110.0100'
Within ',
Nibble separated with dots

6 • Important Comments
Safety Notes
WAGO-I/O-SYSTEM 750
I/O Modules
1.4 Safety Notes
Warning
Switch off the system prior to working on bus modules!
In the event of deformed contacts, the module in question is to be replaced, as
its functionality can no longer be ensured on a long-term basis.
The components are not resistant against materials having seeping and
insulating properties. Belonging to this group of materials is: e.g. aerosols,
silicones, triglycerides (found in some hand creams).
If it cannot be ruled out that these materials appear in the component
environment, then additional measures are to be taken:
- installation of the components into an appropriate enclosure
- handling of the components only with clean tools and materials.
Attention
Cleaning of soiled contacts may only be done with ethyl alcohol and leather
cloths. Thereby, the ESD information is to be regarded.
Do not use any contact spray. The spray may impair the functioning of the
contact area.
The WAGO-I/O-SYSTEM 750 and its components are an open system. It
must only be assembled in housings, cabinets or in electrical operation
rooms. Access must only be given via a key or tool to authorized qualified
personnel.
The relevant valid and applicable standards and guidelines concerning the
installation of switch boxes are to be observed.
ESD (Electrostatic Discharge)
The modules are equipped with electronic components that may be destroyed
by electrostatic discharge. When handling the modules, ensure that the
environment (persons, workplace and packing) is well grounded. Avoid
touching conductive components, e.g. gold contacts.
1.5 Scope
This manual describes the Analog Input Module 750-481/003-000
2 AI RTD EEx i of the modular WAGO-I/O-SYSTEM 750.
Handling, assembly and start-up are described in the manual of the Fieldbus
Coupler. Therefore this documentation is valid only in the connection with the
appropriate manual.

750-481/003-000 [2 AI RTD EEx i] • 7
View
WAGO-I/O-SYSTEM 750
I/O Modules
2 I/O Modules
2.1 Analog Input Modules
2.1.1 750-481/003-000 [2 AI RTD EEx i]
2-Channel Analog Input Module for RTDs, EEx i
2.1.1.1 View
13 14
+R1 +R2
R1 R2
-R1 -R2
750-481/
15 16
RL 1
+R 1
RL 2
+R 2
-R 1 -R 2
SS
003-000
Function AI 1
Error AI 1
Function AI 2
Data contacts
Error AI 2
Shield
(screen)
Power jumper contacts
2-conductor 3-conductor
Resistance
measuring Potentiometer
Shield
(screen)
Fig. 2.1.1-1: 2-Channel Analog Input Module 750-481/003-000 g048100e
2.1.1.2 Description
The 750-481/003-000 analog input module processes signals from resistance
sensors that are operating in hazardous environments of Zones 0 and 1. It
allows the connection of Pt and Ni resistance sensors potentiometers.
The installation of the WAGO-I/O-SYSTEM 750 is to be done in Zone 2 or in
non- hazardous environments.
The operating mode of the 750-481/003-000 can be set by using the WAGO-
I/O-CHECK 2 start-up and diagnostic tool (Item No.: 759-302). The default
setting is Pt 100.
Depending on the operating mode, the resistance value is converted to a
temperature or directly sent out by the module. A microprocessor within the
module is used for converting and linearizing the measured resistance value
into a numeric value proportional to the temperature of the selected resistance
sensor.

8 • 750-481/003-000 [2 AI RTD EEx i]
Description
WAGO-I/O-SYSTEM 750
I/O Modules
The module has two input channels allowing the direct connection of two 2-
or 3-wire resistance sensors.
For example, two 3-wire sensors can be connected either to +R1, RL1 and –
R1 or to +R2, RL2 and –R2.
The 24 V power supply is made via the power jumper contacts.
Each input channel of a module has a shield (screen) connection (S). The
shield (screen) is directly connected to the DIN rail. A capacitive connection
is made automatically when snapped onto the DIN rail.
An optocoupler is used for electrical isolation between the bus and the field
side.
The operational readiness and trouble-free internal data bus communication of
the channels are indicated via a green Function LED. Broken wire, short
circuit, overrange or underflow of the measuring range is indicated via a red
error LED.
Any configuration of the input modules is possible within an intrinsically safe
segment when designing the fieldbus node. Grouping of module types is not
necessary.
Attention
An additional supply module 750-625, DC 24 V EEx i must be added for the
approved intrinsically safe field side supply voltage of 24 V.
Supply principle:
625 435 535 485
EEx i EEx iEEx iEEx i EEx i
585
24 V 24 V 24 V
Fieldbus Coupler/ Controller I/O Modules
End module
Electronic Field Field
Potential 2Potential 1
The supply voltage for the field side is made automatically through the
individual I/O modules by means of power jumper contacts.

750-481/003-000 [2 AI RTD EEx i] • 9
Display Elements
WAGO-I/O-SYSTEM 750
I/O Modules
Note
If the employment of further DC 24 V EEx i Supply modules is necessary for
reasons of extent of utilization, four Separation modules (750-616) must be
used to guarantee the distance between the intrinsically safe segments.
Warning
The maximum current of the internal power jumper contacts is 10 A. When
configuring the system it is important not to exceed the maximum/sum
current. However, if such a case should occur, another supply module must be
added.
The analog input module 750-481/003-000 can be used with all
couplers/controllers of the WAGO-I/O-SYSTEM 750 (except for the economy
types 750-320, -323, -324 and -327).
Further Information
General information on explosion prevention is described in the manual in
section “Use in Hazardous Environments“!
2.1.1.3 Display Elements
LED Channel Meaning State Function
off
No operational readiness or the
internal data bus communication
is interrupted
green Function
AI 1
on
Operational readiness and
trouble-free internal data bus
communication
off Normal operation
red
1
Error
AI 1 on
Overrange/underflow of the
admissible measuring range,
broken wire, short circuit
off
No operational readiness or the
internal data bus communication
is interrupted
green Function
AI 2
on
Operational readiness and
trouble-free internal data bus
communication
off Normal operation
13 14 15 16
Function AI 1
Error AI 1
Function AI 2
Error AI 2
Fig. 2.1.1-2: Display
Elements g048102d
red
2
Error
AI 2 on
Overrange/underflow of the
admissible measuring range,
broken wire, short circuit

10 • 750-481/003-000 [2 AI RTD EEx i]
Schematic Diagram
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.4 Schematic Diagram
750-481/
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
0V
-R1/-R2
+R
330pF
RL
330pF 330pF
-R
MUX A
D
+R1/+R2
24 V
RL1/RL2
003-000
4,7nF
10nF
DC
DC
24 V
0V
Shield
(screen)
Logic
Function
Error
Shield
(screen)
Fig. 2.1.1-3: 2-Channel Analog Input Module 750-481/003-000 g048101e

750-481/003-000 [2 AI RTD EEx i] • 11
Technical Data
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.5 Technical Data
Module Specific Data
Number of inputs 2
Voltage via power jumper contacts DC 24.7 V Supply via 750-625 Supply Module
EEx i
Current consumption typ. (internal) 25 mA
Current consumption typ. (24 V) 12 mA
Measuring current < 0.5 mA
Sensor types
(setting over software
WAGO-I/O-CHECK 2)
Resistance temperature: Pt 100 (factory preset),
Pt 200, Pt 500, Pt 1000, Ni 100, Ni 120, Ni 1000
Resistance measuring: 1,2 kΩ, 5 kΩ
Potentiometer: 1.2 kΩ(0 ... 100 %), 5 kΩ(0 ...
100 %)
Sensor connection 3-wire (factory preset) or 2-wire
Temperature range -200 °C ... +850 °C (Pt)
-60 °C ... + 250 °C (Ni)
-80 °C ... +320 °C (Ni120)
Resolution (over whole range) 0.1 °C, 0.1 Ω, 0.0049 %
Resolution 150 ms ... 500 ms per channel
Measuring error 25°C <±0.2 % of full scale value
Temperature coefficient <±0.01 % /K of full scale value
Power consumption Pmax. 0.45 W
Power loss P v 0.45 W
Isolation 500 V (Field/System)
Bit width 2 x 16 bits data
2 x 8 bits control/status (option)
Dimensions (mm) W x H x L 24 x 64* x 100
* from upper edge of 35 DIN rail
Weight ca. 105 g
Standards and Regulations (cf. Chapter 2.2 of the Coupler/Controller Manual)
EMC-Immunity to interference
(CE)
acc. to EN 61000-6-2 (99)
EMC-Emission of interference
(CE)
acc. to EN 61000-6-4 (02)
EC-EMV directive 89/336/EEC
EC low voltage directive 73/23/EEC
Approvals (cf. Chapter 2.2 of the Coupler/Controller Manual)
CULUS (UL508)
TÜV 02ATEX1875 X
Conformity Marking

12 • 750-481/003-000 [2 AI RTD EEx i]
Technical Data
WAGO-I/O-SYSTEM 750
I/O Modules
Explosion Protection
Ex directive 94/9/EC
EN 50014, EN 50020, EN 50021
Marking II 3 (1) GD EEx nA [ia] IIC/IIB T4
Safety data U0 = 7.2 V
I0 = 5.8 mA
P0 = 10.5 mW
Line characteristic: linear
EEx ia IIC EEx ia IIB
L0C0L0C0
Reactance
without consideration of the
simultaneousness
0.9 H 13.5 µF 1 H 240 µF
IIC IIB
L0C0L0C0
≤0.01 mH 7.40 µF≤0.01 mH 60.0 µF
0.2 mH 2.60 µF0.2 mH
15.0 µF
1.0 mH 1.80 µF1.0 mH
9.7 µF
10.0 mH 1.20 µF10.0 mH 6.3 µF
Reactance
with consideration of the
simultaneousness
100.0 mH 0.97 µF100.0 mH 4.8 µF
More Information
Detailed references to the approvals are listed in the document "Overview
Approvals WAGO-I/O-SYSTEM 750", which you can find on the CD ROM
ELECTRONICC Tools and Docs (Item-No.: 0888-0412)
or in the internet under:
www.wago.com !Documentation !WAGO-I/O-SYSTEM 750 !
System Description

750-481/003-000 [2 AI RTD EEx i] • 13
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.6 Process Image
The input module 750-481/003-000 transmits 16-bit measured values and
8 optional status bits per channel.
Some fieldbus systems can process input channel status information by means
of a status byte.
This status byte can be displayed via the starting tool WAGO-I/O-CHECK 2.
However, processing via the coupler / controller is optional, which means that
accessing or parsing the status information depends on the fieldbus system.
Attention
The representation of the process data of some I/O modules or their
variations in the process image depends on the fieldbus coupler/-controller
used. Please take this information as well as the particular design of the
respective control/status bytes from the section "Fieldbus Specific Design of
the Process Data" included in the description concerning the process image o
f
the corresponding coupler/controller.
2.1.1.6.1 Configuration for Pt Resistance Sensors
Pt resistance sensors
Evaluation of Pt 100 (Measuring range: -200 °C ... +850 °C)
Evaluation of Pt 200 (Measuring range: -200 °C ... +850 °C)
Evaluation of Pt 500 (Measuring range: -200 °C ... +850 °C)
Evaluation of Pt 1000 (Measuring range: -200 °C ... +850 °C)
To evaluate the platinum resistance sensors, the measured values of the
resistance are converted and sent as temperature values.
All temperature values are represented in a standard numeric format. The
possible numerical range matches the defined temperature range of the Pt
sensors from -200 °C to +850 °C..
In the Pt 100, Pt 200, Pt 500 and Pt 1000 settings, the temperature values of
the sensors are represented with a resolution of 1 digit per 0.1 °C within a
word (16 bits). Thus, 0 °C corresponds to the numeric value 0x0000 and 100
°C to 0x03E8 (dec. 1000).
Temperature values below 0 °C are represented in two’s complement binary
form.

14 • 750-481/003-000 [2 AI RTD EEx i]
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
Configuration for Pt 100, Pt 200, Pt 500 and Pt 1000
Temperature Numerical value 1)
Status-
byte
LED
Error
°C binary hex. dec. hex. AI 1, 2
<-200.0 '1000.0000.0000.0001' 0x8001 -32767 0x41 on
-200.0 '1111.1000.0011.0000' 0xF830 -2000 0x00 off
-100.0 '1111.1100.0001.1000' 0xFC18 -1000 0x00 off
0.0 '0000.0000.0000.0000' 0x0000 0 0x00 off
100.0 '0000.0011.1110.1000' 0x03E8 1000 0x00 off
200.0 '0000.0111.1101.0000' 0x07D0 2000 0x00 off
500.0 '0001.0011.1000.1000' 0x1388 5000 0x00 off
750.0 '0001.1101.0100.1100' 0x1D4C 7500 0x00 off
800.0 '0001.1111.0100.0000' 0x1F40 8000 0x00 off
850.0 '0010.0001.0011.0100' 0x2134 8500 0x00 off
>850.0 '0010.0001.0011.0100' 0x2134 8500 0x42 on
Broken wire
against RL
'0010.0001.0011.0100' 0x2134 8500 0x42 on
1) Temperature values below 0 °C are represented in two’s complement binary form.
The measured value can exceed the range from –2000 to 8500 until the limitation applies.
2.1.1.6.2 Configuration for Ni Resistance Sensors
Ni resistance sensors
Evaluation of Ni 100 (Measuring range: -60 °C ... +250 °C)
Evaluation of Ni 120 (Measuring range: -80 °C ... +320 °C)
Evaluation of Ni 1000 (Measuring range: -60 °C ... +250 °C)
To evaluate the nickel resistance sensors, the measured values of the
resistance are converted and sent as temperature values.
All temperature values are represented in a standard numeric format. The
possible numerical range matches the defined temperature range of the Ni
sensors from -60 °C to +250 °C or from -80 °C to +320 °C.
In the Ni 100, Ni 120 and Ni 1000 settings, the temperature values of the
sensors are represented with a resolution of 1 digit per 0.1 °C within a word
(16 bits). Thus, 0 °C corresponds to the numeric value 0x0000 and 100 °C to
0x03E8 (dec. 1000).
Temperature values below 0 °C are represented in two’s complement binary
form.

750-481/003-000 [2 AI RTD EEx i] • 15
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
Configuration for Ni 100 and Ni 1000
Temperature Numerical value 1)
Status-
byte
LED
Error
°C binary hex. dec. hex. AI 1,2
<-60.0 '1000.0000.0000.0001' 0x8001 -32767 0x41 on
-60.0 '1111.1101.1010.1000' 0xFDA8 -600 0x00 off
-50.0 '1111.1110.0000.1100' 0xFE0C -500 0x00 off
0.0 '0000.0000.0000.0000' 0x0000 0 0x00 off
50.0 '0000.0001.1111.0100' 0x01F4 500 0x00 off
100.0 '0000.0011.1110.1000' 0x03E8 1000 0x00 off
150.0 '0000.0101.1101.1100' 0x05DC 1500 0x00 off
200.0 '0000.0111.1101.0000' 0x07D0 2000 0x00 off
250.0 '0000.1001.1100.0100' 0x09C4 2500 0x00 off
>250.0 '0010.0001.0011.0100' 0x2134 8500 0x42 on
Broken wire
against RL
'0010.0001.0011.0100' 0x2134 8500 0x42 on
1) Temperature values below 0 °C are represented in two’s complement binary form.
The measured value can exceed the range from –600 to 2500 until the limitation applies.
Configuration for Ni 120
Temperature Numerical value 1)
Status-
byte
LED
Error
°C binary hex. dec. hex. AI 1,2
<-80.0 '1000.0000.0000.0001' 0x8001 -32767 0x41 on
-80.0 '1111.1100.1110.0000' 0xFCE0 -800 0x00 off
-50.0 '1111.1110.0000.1100' 0xFE0C -500 0x00 off
0.0 '0000.0000.0000.0000' 0x0000 0 0x00 off
50.0 '0000.0001.1111.0100' 0x01F4 500 0x00 off
100.0 '0000.0011.1110.1000' 0x03E8 1000 0x00 off
150.0 '0000.0101.1101.1100' 0x05DC 1500 0x00 off
200.0 '0000.0111.1101.0000' 0x07D0 2000 0x00 off
250.0 '0000.1001.1100.0100' 0x09C4 2500 0x00 off
300.0 '0000.1011.1011.1000' 0x0BB8 3000 0x00 off
320.0 '0000.1100.1000.0000' 0x0C80 3200 0x00 off
>320.0 '0010.0001.0011.0100' 0x2134 8500 0x42 on
Broken wire
against RL
'0010.0001.0011.0100' 0x2134 8500 0x42 on
1) Temperature values below 0 °C are represented in two’s complement binary form.
The measured value can exceed the range from –800 to 3200 until the limitation applies.

16 • 750-481/003-000 [2 AI RTD EEx i]
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.6.3 Configuration for Resistance Measuring
Resistance measuring
Resistance measuring, Measuring range: 10 Ω... 1.2 kΩ
Resistance measuring, Measuring range: 10 Ω... 5.0 kΩ
Resistance measuring is only possible using 2-wire devices.
The measured values are sent out directly when measuring the resistance.
In the measuring range from 10 Ωto 1.2 kΩ, the resolution is 1 digit per 0.1
Ω.
In the measuring range from 10 Ωto 5.0 kΩ, the resolution is 1 digit per 0.5
Ω.
Configuration for measuring range 10 Ω... 1.2 kΩ
Resistance Numerical value 1)
Status-
byte
LED
Error
Ωbinary hex. dec. hex. AI 1,2
0 '1110.1100.0000.0000' 0xEC00 -5120 0x00 off
10 '0000.0000.0110.0100' 0x0064 100 0x00 off
100 '0000.0011.1110.1000' 0x03E8 1000 0x00 off
200 '0000.0111.1101.0000' 0x07D0 2000 0x00 off
300 '0000.1011.1011.1000' 0x0BB8 3000 0x00 off
400 '0000.1111.1010.0000' 0x0FA0 4000 0x00 off
500 '0001.0011.1000.1000' 0x1388 5000 0x00 off
750 '0001.1101.0100.1100' 0x1D4C 7500 0x00 off
1000 '0010.0111.0001.0000' 0x2710 10000 0x00 off
1200 '0010.1110.1110.0000' 0x2EE0 12000 0x00 off
>ca.1200 '0010.0001.0011.0100' 0x2134 8500 0x42 on
Values marked with "ca." are not calibrated.
Configuration for measuring range 10 Ω... 5 kΩ
Resistance Numerical value 1)
Status-
byte
LED
Error
Ωbinary hex. dec. hex. binary
0 '1110.1100.0000.0000' 0xEC00 -5120 0x00 off
10 '0000.0000.0001.0100' 0x0014 20 0x00 off
100 '0000.0000.1100.1000' 0x00C8 200 0x00 off
200 '0000.0001.1001.0000' 0x0190 400 0x00 off
300 '0000.0010.0101.1000' 0x0258 600 0x00 off
1000 '0000.0111.1101.0000' 0x07D0 2000 0x00 off
2000 '0000.1111.1010.0000' 0x0FA0 4000 0x00 off
3000 '0001.0111.0111.0000' 0x1770 6000 0x00 off
4000 '0001.1111.0100.0000' 0x1F40 8000 0x00 off
5000 '0010.0111.0001.0000' 0x2710 10000 0x00 off
>ca.5000 '0010.0111.0001.0000' 0x2710 10000 0x42 on
Values marked with "ca." are not calibrated.

750-481/003-000 [2 AI RTD EEx i] • 17
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.6.4 Configuration for Potentiometer Measuring
Potentiometer measuring
Total resistance 1.2 kΩ,
Output of measured value in percent
Total resistance 5.0 kΩ,
Output of measured value in percent
Potentiometer measuring is only possible using 3-wire devices.
When a potentiometer is used for measurement, the relative position of the
connected potentiometer is expressed in percent:
x = 100 % )(
)(
Gtotal
Sslider
RR
RR
∗.
Two settings are available, one for potentiometers with total resistance up to
1.2 kΩand one for potentiometers up to 5.0 kΩ.
The resolution is 1 digit per 0.0049 %. The increment is determined by the
total resistance RGof the potentiometer.
As RGis measured with 16 bit resolution, using RG= 200 Ωin the measuring
range of 5.0 kΩ, the increment is given by
d = Ω∗
Ω
∗
20065536
0.5%100 k= 0.04 %.
Configuration for potentiometer measuring
Percentage Numerical value 1)
Status-
byte
LED
Error
% binary hex. dec. hex. AI 1,2
0.0 '0000.0000.0000.0000' 0x0000 0 0x00 off
20.0 '0000.0111.1101.0000' 0x1000 4096 0x00 off
40.0 '0000.1111.1010.0000' 0x2000 8192 0x00 off
60.0 '0001.0111.0111.0000' 0x3000 12288 0x00 off
80.0 '0001.1111.0100.0000' 0x4000 16384 0x00 off
100.0 '0010.0111.0001.0000' 0x4FFF 20479 0x00 off
>ca. 100.0 '0010.0111.0001.0000' 0x4FFF 20479 0x40 on
Values marked with "ca." are not calibrated.

18 • 750-481/003-000 [2 AI RTD EEx i]
Configuration with WAGO-I/O-CHECK 2
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.7 Configuration with WAGO-I/O-CHECK 2
The operating mode of the 750-481/003-000 module can be parameterized
using the WAGO-I/O-CHECK 2 start-up and diagnostic tool (Item No.: 759-
302). The default setting is Pt 100.
The parameter dialog box of WAGO-I/O-CHECK 2 contains select boxes
that are used to set this module.
Select box Available settings
RTD Type Pt100 (-200 °C – 850 °C)* / Ni100 (-60 °C – 250 °C) /
Pt1000 (-200 °C – 850 °C) / Pt500 (-200 °C – 850 °C) /
Pt200 (-200 °C – 850 °C) / Ni1000 (-80 °C – 320 °C) /
Ni120 (-80 °C – 320 °C) / Ohm ( 10.0 Ω– 5000.0 Ω) /
Ohm (10.0 Ω– 1200.0 Ω)
2-wire Two-wire connectionConnection
3-wire* Three-wire connection
OFF* State bits are not mappedState Bits
ON State bits are mapped to the lower three bits of
the output value:
Bit 0:overrun. Bit is set if measuring value runs
out of range.
Bit 1:error. Bit is set if the module detects an
error in internal functions or a shortcut at the
input.
Bit 2: 0
OFF Watchdog timer not activeWatchdog
Timer ON* Watchdog timer active.
If no data are exchanged with the buscoupler for
100 ms, the green LEDs will turn off.
OFF* Two´s complement indicationAmount Sign
ON Amount/Sign indication
Filter
Constants
12.5 Hz – 500 ms / 25 Hz – 250 ms* / 50 Hz – 125 ms /
60 Hz – 110 ms / 100 Hz – 65 ms
OFF The output value is not limitedOverrange
Protection ON* If the temperature exceeds 850°C, the status bits
are set and the output value is limited to 850°C
OFF* User scaling not activeUser Scaling
ON User scaling active
OFF WAGO scaling not activeWAGO
Scaling ON* WAGO scaling active
* default settings

750-481/003-000 [2 AI RTD EEx i] • 19
Configuration with WAGO-I/O-CHECK 2
WAGO-I/O-SYSTEM 750
I/O Modules
In WAGO-I/O-CHECK 2, the following input boxes allow you to set the
offset and gain values of the user and manufacturer scaling.
Input box ... Offset Gain
User Scaling ... 0x0000 0x0100
WAGO Scaling ... 0x0000 0x00A0
The following input boxes are available in WAGO-I/O-CHECK 2for
hardware calibration.
Input box Settings
Offset resistance 0xECF0
Gain resistance 0x2700
2-wire-offset 0x0180
Input box Settings
Offset potentiometer 0xFFC0
Gain potentiometer 0xFE00
Further information
You can find detailed information on parameterizing this module in the
WAGO-I/O-CHECK 2 manual or on the Internet at www.wago.com.

20 • Use in Hazardous Environments
Foreword
WAGO-I/O-SYSTEM 750
I/O Modules
3 Use in Hazardous Environments
3.1 Foreword
Today’s development shows that many chemical and petrochemical
companies have production plants, production, and process automation
machines in operation which use gas-air, vapor-air and dust-air mixtures
which can be explosive. For this reason, the electrical components used in
such plants and systems must not pose a risk of explosion resulting in injury to
persons or damage to property. This is backed by law, directives or regulations
on a national and international scale. WAGO-I/O-SYSTEM 750 (electrical
components) is designed for use in zone 2 explosive environments. The
following basic explosion protection related terms have been defined.
3.2 Protective measures
Primarily, explosion protection describes how to prevent the formation of an
explosive atmosphere. For instance by avoiding the use of combustible
liquids, reducing the concentration levels, ventilation measures, to name but a
few. But there are a large number of applications, which do not allow the
implementation of primary protection measures. In such cases, the secondary
explosion protection comes into play. Following is a detailed description of
such secondary measures.
3.3 Classification meeting CENELEC and IEC
The specifications outlined here are valid for use in Europe and are based on
the following standards: EN50... of CENELEC (European Committee for
Electrotechnical Standardization). On an international scale, these are
reflected by the IEC 60079-... standards of the IEC (International
Electrotechnical Commission).
3.3.1 Divisions
Explosive environments are areas in which the atmosphere can potentially
become explosive. The term explosive means a special mixture of ignitable
substances existing in the form of air-borne gases, fumes, mist or dust under
atmospheric conditions which, when heated beyond a tolerable temperature or
subjected to an electric arc or sparks, can produce explosions. Explosive zones
have been created to describe the concentrations level of an explosive
atmosphere. This division, based on the probability of an explosion occurring,
is of great importance both for technical safety and feasibility reasons.
Knowing that the demands placed on electrical components permanently
employed in an explosive environment have to be much more stringent than
those placed on electrical components that are only rarely and, if at all, for
short periods, subject to a dangerous explosive environment.