HIMA HIMatrix MI 24 01 User manual

HIMatrix
Safety-Related Controller
MI 24 01 Manual
HIMA Paul Hildebrandt GmbH + Co KG
Industrial Automation
Rev. 2.00 HI 800 209 E

HI 800 209 E Rev. 2.00 (1334)
All HIMA products mentioned in this manual are protected by the HIMA trade-mark. Unless noted otherwise,
this also applies to other manufacturers and their respective products referred to herein.
HIMax®, HIMatrix®, SILworX®, XMR®and FlexSILon®are registered trademarks of HIMA Paul Hildebrandt
GmbH + Co KG.
All of the instructions and technical specifications in this manual have been written with great care and
effective quality assurance measures have been implemented to ensure their validity. For questions, please
contact HIMA directly. HIMA appreciates any suggestion on which information should be included in the
manual.
Equipment subject to change without notice. HIMA also reserves the right to modify the written material
without prior notice.
For further information, refer to the HIMA DVD and our website at http://www.hima.de and
http://www.hima.com.
© Copyright 2013, HIMA Paul Hildebrandt GmbH + Co KG
All rights reserved
Contact
HIMA contact details:
HIMA Paul Hildebrandt GmbH + Co KG
P.O. Box 1261
68777 Brühl, Germany
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
Type of change
Revision
index
Revisions
technical editorial
1.00 Added: Configuration with SILworX X X
2.00 Added: MI 24 014, SIL 4 certified according to EN 50126,
EN 50128 and EN 50129, Chapter 4.1.6
X X

MI 24 01 Table of Contents
HI 800 209 E Rev. 2.00 Page 3 of 48
Table of Contents
1Introduction 5
1.1 Structure and Use of this Manual 5
1.2 Target Audience 6
1.3 Formatting Conventions 7
1.3.1 Safety Notes 7
1.3.2 Operating Tips 8
2Safety 9
2.1 Intended Use 9
2.1.1 Environmental Requirements 9
2.1.2 ESD Protective Measures 9
2.2 Residual Risk 10
2.3 Safety Precautions 10
2.4 Emergency Information 10
3Product Description 11
3.1 Safety Function 11
3.1.1 Safety-Related Analog Inputs 11
3.1.1.1 Reaction in the Event of a Fault 11
3.1.2 Safety-Related Digital Inputs 11
3.1.2.1 Reaction in the Event of a Fault 11
3.2 Equipment, Scope of Delivery 12
3.3 Type Label 12
3.4 Structure 13
3.4.1 Block diagram 13
3.4.2 Front View 14
3.4.3 Status Indicators 15
3.4.4 I/O LEDs 15
3.4.5 Outputs for Transmitter and Proximity Switch Supply 15
3.5 Product Data 16
3.5.1 Product Data MI 24 014 18
4Start-up 19
4.1 Installation and Mounting 19
4.1.1 Mounting and Removing the Modules 19
4.1.2 Analog Inputs 20
4.1.3 Digital Inputs 21
4.1.4 Pin Designation 21
4.1.5 Pin Assignment for the MI 24 01 Module 22
4.1.5.1 Surges on Digital Inputs 25
4.1.6 Cable Plugs 25
4.1.7 Mounting the MI 24 01 in Zone 2 26

Table of Contents MI 24 01
Page 4 of 48 HI 800 209 E Rev. 2.00
4.1.8 Power Dissipation of the MI 24 01 27
4.1.8.1 Connecting an Active Transmitter 27
4.1.8.2 Connecting a Passive Transmitter 27
4.1.8.3 Connecting Proximity Switches (Contact Wired with Resistors) 27
4.2 Configuration 28
4.2.1 Module Slots 28
4.2.2 Line Control 29
4.3 Configuration with SILworX 29
4.3.1 Parameters and Error Codes for the Inputs and Outputs 29
4.3.2 Analog and Digital Outputs 30
4.3.2.1 Tab: Module 30
4.3.2.2 Tab: MI 24 01_1: Channels 31
4.4 Configuration with ELOP II Factory 32
4.4.1 Configuring the Inputs and Outputs 32
4.4.2 Signals and Error Codes for the Inputs and Outputs 32
4.4.3 Analog and Digital Inputs 33
4.5 Connection Variants 35
4.5.1 Connecting the Shielding to the F60 Earth Grid 35
4.5.2 Connection Example 35
5Operation 38
5.1 Handling 38
5.2 Diagnosis 38
6Maintenance 39
6.1 Faults 39
6.2 Maintenance Measures 39
6.2.1 Loading the Operating System 39
6.2.2 Proof Test 39
7Decommissioning 40
8Transport 41
9Disposal 42
Appendix 43
Glossary 43
Index of Figures 44
Index of Tables 45
Index 46

MI 24 01 1 Introduction
HI 800 209 E Rev. 2.00 Page 5 of 48
1 Introduction
This manual describes the technical characteristics of the module and its use. It provides
information on how to install, start up and configure the module.
1.1 Structure and Use of this Manual
The content of this manual is part of the hardware description of the HIMatrix programmable
electronic system.
This manual is organized in the following main chapters:
Introduction
Safety
Product Description
Start-up
Operation
Maintenance
Decommissioning
Transport
Disposal
The HIMatrix F60 is available for the programming tools SILworX and ELOP II Factory. Which
programming tool can be used, depends on the processor operating system of the HIMatrix
F60, refer to the following table:
Programming tool Processor operating system Communication operating system
SILworX CPU OS V7 and higher COM OS V12 and higher
ELOP II Factory CPU OS up to V6.x COM OS up to V11.x
Table 1: Programming Tools for HIMatrix F60
In the manual, the differences are specified by using:
Separated chapters
Tables differentiating among the versions
iProjects created with ELOP II Factory cannot be edited with SILworX, and vice versa!
iThe manual usually refers to the plug-in cards of the modular controller F60 as modules.
Modules is also the term used in SILworX.

1 Introduction MI 24 01
Page 6 of 48 HI 800 209 E Rev. 2.00
Additionally, the following documents must be taken into account:
Name Content Document number
HIMatrix System Manual
Compact Systems
Hardware description of the HIMatrix
compact systems
HI 800 141 E
HIMatrix System Manual
Modular System F60
Hardware description of the HIMatrix
modular system
HI 800 191 E
HIMatrix Safety Manual Safety functions of the HIMatrix system HI 800 023 E
HIMatrix Safety Manual for
Railway Applications
Safety functions of the HIMatrix system
using the HIMatrix in railway
applications
HI 800 437 E
SILworX Online Help Instructions on how to use SILworX -
ELOP II Factory
Online Help
Instructions on how to use ELOP II
Factory, Ethernet IP protocol
-
SILworX First Steps Introduction to SILworX using the
HIMax system as an example
HI 801 103 E
ELOP II Factory First Steps Introduction to ELOP II Factory HI 800 006 E
Table 2: Additional Relevant Documents
The latest manuals can be downloaded from the HIMA website at www.hima.com. The revision
index on the footer can be used to compare the current version of existing manuals with the
Internet edition.
1.2 Target Audience
This document addresses system planners, configuration engineers, programmers of
automation devices and personnel authorized to implement, operate and maintain the modules
and systems. Specialized knowledge of safety-related automation systems is required.

MI 24 01 1 Introduction
HI 800 209 E Rev. 2.00 Page 7 of 48
1.3 Formatting Conventions
To ensure improved readability and comprehensibility, the following fonts are used in this
document:
Bold To highlight important parts
Names of buttons, menu functions and tabs that can be clicked and used
in the programming tool.
Italics For parameters and system variables
Courier Literal user inputs
RUN Operating state are designated by capitals
Chapter 1.2.3 Cross references are hyperlinks even though they are not particularly
marked. When the cursor hovers over a hyperlink, it changes its shape.
Click the hyperlink to jump to the corresponding position.
Safety notes and operating tips are particularly marked.
1.3.1 Safety Notes
The safety notes are represented as described below.
These notes must absolutely be observed to reduce the risk to a minimum. The content is
structured as follows:
Signal word: warning, caution, notice
Type and source of risk
Consequences arising from non-observance
Risk prevention
The signal words have the following meanings:
Warning indicates hazardous situation which, if not avoided, could result in death or serious
injury.
Caution indicates hazardous situation which, if not avoided, could result in minor or modest
injury.
Notice indicates a hazardous situation which, if not avoided, could result in property damage.
NOTE
Type and source of damage!
Damage prevention
SIGNAL WORD
Type and source of risk!
Consequences arising from non-observance
Risk prevention

1 Introduction MI 24 01
Page 8 of 48 HI 800 209 E Rev. 2.00
1.3.2 Operating Tips
Additional information is structured as presented in the following example:
iThe text corresponding to the additional information is located here.
Useful tips and tricks appear as follows:
TIP The tip text is located here.

MI 24 01 2 Safety
HI 800 209 E Rev. 2.00 Page 9 of 48
2 Safety
All safety information, notes and instructions specified in this document must be strictly
observed. The product may only be used if all guidelines and safety instructions are adhered to.
This product is operated with SELV or PELV. No imminent risk results from the product itself.
The use in Ex-zone is permitted if additional measures are taken.
2.1 Intended Use
HIMatrix components are designed for assembling safety-related controller systems.
When using the components in the HIMatrix system, comply with the following general
requirements.
2.1.1 Environmental Requirements
Requirement type Range of values 1)
Protection class Protection class III in accordance with IEC/EN 61131-2
Ambient temperature 0...+60 °C
Storage temperature -40...+85 °C
Pollution Pollution degree II in accordance with IEC/EN 61131-2
Altitude < 2000 m
Housing Standard: IP20
Supply voltage 24 VDC
1) The values specified in the technical data apply and are decisive for devices with extended
environmental requirements.
Table 3: Environmental Requirements
Exposing the HIMatrix system to environmental conditions other than those specified in this
manual can cause the HIMatrix system to malfunction.
2.1.2 ESD Protective Measures
Only personnel with knowledge of ESD protective measures may modify or extend the system
or replace devices.
NOTE
Device damage due to electrostatic discharge!
When performing the work, make sure that the workspace is free of static, and wear
an ESD wrist strap.
If not used, ensure that the device is protected from electrostatic discharge, e.g., by
storing it in its packaging.

2 Safety MI 24 01
Page 10 of 48 HI 800 209 E Rev. 2.00
2.2 Residual Risk
No imminent risk results from a HIMatrix system itself.
Residual risk may result from:
Faults related to engineering
Faults related to the user program
Faults related to the wiring
2.3 Safety Precautions
Observe all local safety requirements and use the protective equipment required on site.
2.4 Emergency Information
A HIMatrix system is a part of the safety equipment of a site. If a device or a module fails, the
system enters the safe state.
In case of emergency, no action that may prevent the HIMatrix systems from operating safely is
permitted.

MI 24 01 3 Product Description
HI 800 209 E Rev. 2.00 Page 11 of 48
3 Product Description
The MI 24 01 is a module for the modular F60 HIMatrix system.
The MI 24 01 module has 24 digital input channels. The analog inputs AI are inputs for
measuring currents of 0/4...20 mA. The digital inputs DI can be used with proximity switches in
accordance with EN 60947-5-6, safety proximity switches or contacts (wired with resistors).
iAnalog and digital inputs cannot be used simultaneously, but one or the other depending on the
channel configuration
Ensure proper configuration of the inputs. Each channel must be configured individually.
The module can be inserted in the F60 subrack's slot 3...8. Slots 1 and 2 are reserved for the
power supply module and central module, respectively.
The module has been certified by the TÜV for safety-related applications up to SIL 3
(IEC 61508, IEC 61511 and IEC 62061), Cat. 4 and PL e (EN ISO 13849-1) and SIL 4
(EN 50126, EN 50128 and EN 129).
Further safety standards, application standards and test standards are specified in the
certificates available on the HIMA website.
3.1 Safety Function
The module is equipped with safety-related inputs that can be used as analog or digital inputs.
3.1.1 Safety-Related Analog Inputs
The analog inputs are inputs for measuring currents of 0/4...20 mA.
3.1.1.1 Reaction in the Event of a Fault
If the device detects a fault on an analog input, the AI.Error Code parameter is set to a value
greater than 0. If a module fault occurred, the SILworX system parameter Module Error Code is
set to a value greater than 0, or if ELOP II Factory is used, the Module.Error Code signal is set
to a value greater than 0.
In both cases, the module activates the ERR LED.
In addition to the analog value the the error code must be evaluated. The analog value must be
configured to ensure a safety-related reaction.
The error code allows the user to configure additional fault reactions in the user program.
3.1.2 Safety-Related Digital Inputs
The digital inputs of the module operate as analog inputs, but return digital values due to the
configuration of switching thresholds.
3.1.2.1 Reaction in the Event of a Fault
If the module detects a fault on a digital input, the user program processes a low level in
accordance with the de-energized to trip principle.
The module activates the ERR LED.
In addition to the channel signal value, the user program must also consider the corresponding
error code.
The error code allows the user to configure additional fault reactions in the user program.

3 Product Description MI 24 01
Page 12 of 48 HI 800 209 E Rev. 2.00
3.2 Equipment, Scope of Delivery
The filter and protective modules H 7032 und H 7033 are available for connecting transmitters
to the MI 24 01. The modules H 7032 and the H 7033 are not included within the scope of
delivery of MI 24 01.
The following table specifies the available module variants:
Designation Description
MI 24 01 Module with 24 analog inputs or inputs for proximity switches
MI 24 014 Module with 24 analog inputs or inputs for proximity switches
Operating temperature: -25...+70 °C (temperature class T1),
Vibration and shock tested according to EN 50125-3 and EN 50155,
class 1B according to IEC 61373
H 7032 Filter and protective module for connecting
two-wire transmitters to the HIMatrix MI 24 up to SIL 3.
H 7033 Filter and protective module for connecting
three-wire transmitters to the HIMatrix MI 24 up to SIL 3.
Table 4: Available Variants
3.3 Type Label
The type plate contains the following details:
Product name
Bar code (1D or 2D code)
Part no.
Production year
Hardware revision index (HW Rev.)
Firmware revision index (FW Rev.)
Operating voltage
Mark of conformity
Figure 1: Sample Type Label

MI 24 01 3 Product Description
HI 800 209 E Rev. 2.00 Page 13 of 48
3.4 Structure
This chapter describes the layout and function of the module.
3.4.1 Block diagram
MI 24 01
200R
674R
200R
674R
200R
674R
200R
674R
200R
674R
200R
674R
200R
674R
200R
674R
200R
674R
S1+
DI1+
AI1+
I1-
S2+
DI2+
AI2+
I2-
S8+
DI8+
AI8+
I8-
...
S9+
DI9+
AI9+
I9-
S10+
DI10+
AI10+
I10-
S16+
DI16+
AI16+
I16-
...
S17+
DI17+
AI17+
I17-
S18+
DI18+
AI18+
I18-
S24+
DI24+
AI24+
I24-
...
# #
L- L+3V3GND
1
2
3
Multiplexer
I/O Module
I/O Bus
Figure 2: Block Diagram

3 Product Description MI 24 01
Page 14 of 48 HI 800 209 E Rev. 2.00
3.4.2 Front View
RUN ERR
B
20
19
18
17
24
23
22
21
DI+
AI+I-
S+
12
11
10
09
16
15
14
13
DI+
AI+I-
S+
04
03
02
01
08
07
06
05
DI+S+
28
27
26
25
32
31
30
29
DI+
AI+I-
S+
36
35
34
33
40
39
38
37
DI+
AI+I-
S+
44
43
42
41
48
47
46
45
AI+I-
AB
AB
AB
A
MI 24
01
Figure 3: Front View

MI 24 01 3 Product Description
HI 800 209 E Rev. 2.00 Page 15 of 48
3.4.3 Status Indicators
LED Color Status Description
On Operating voltage presentRUN Green
Off No operating voltage
On Module faulty or external faults
Reaction as dictated by the diagnosis
ERR Red
Off No module faults and / or no channel faults
Table 5: Status Indicators
3.4.4 I/O LEDs
LED Color Status Description
On Use as DI: The related channel is active (energized).
Use as AI: The upper limit has been achieved.
I 1...24 Yellow
Off Use as DI: The related channel is inactive (de-energized).
Use as AI: The lower limit has been achieved.
Table 6: I/O LEDs
The status of the digital input signals is displayed by LEDs located on the front plate next to the
terminal plugs. The second LED for each terminal pin, is not used (see Chapter 4.1.4).
3.4.5 Outputs for Transmitter and Proximity Switch Supply
To supply the external (analog and digital) sensors, the module has 24 outputs divided into 3
groups:
Group Outputs Maximum total current
Group 1 Channels 1...8 200 mA
Group 2 Channels 9...16 200 mA
Group 3 Channels 17...24 200 mA
Table 7: Outputs for Transmitter and Proximity Switch Supply
The supply outputs are short-circuit-proof. Within a group, the current of 200 mA can be
distributed as required. The transmitter supply is switched off if its total current is exceeded. If
the overload disappears within 30 s, the supply is switched on again. If the overload is still
present after 30 s, the module attempts to restart the supply in intervals of 60 s.
Short transient interferences (< 5 ms) do not cause the transmitter supply to switch off.
If an external supply is used or is faulty, the module measurement input may be overloaded and
permanently damaged. If the measurement input is overloaded over a longer time period, the
zero and final values must be checked. For this reason, HIMA recommends to use the internal
module supply and to configure it using the corresponding signal (Transmitter Used [BOOL] ->
set to TRUE).
The transmitter supply is also switched off if the module's transmitter supply is used
(Transmitter Used [BOOL] -> set to TRUE) and the module's measurement input is overloaded.
The module attempts to restart the supply in intervals of 60 s. Switching off the transmitter
supply means that all the outputs of this group are switched off. This also applies to transient
overloads (e.g., by connecting a transmitter). If these cases occur, the Transmitter Used [BOOL]
-> signal must be set to FALSE for the duration of the failure, e.g., by forcing the signal or by
configuring a time function in the user program.
If the module is in STOP, no monitoring for overload is performed, even if Transmitter Used
[BOOL] -> is set to TRUE.
The current limiting voltage outputs can be switched between 8.2 VDC and 26 VDC. The
switching value must be set individually for each output. An operating voltage must be selected
even if it is not used, otherwise the module enters the error state with invalid configuration. The
outputs cannot be forced and may only be defined during the parameter setting.

3 Product Description MI 24 01
Page 16 of 48 HI 800 209 E Rev. 2.00
The voltage limits of the outputs are safely monitored. If the error limits are exceeded, an error
bit is set.
For supplying a channel, the voltage output assigned to the input must be used (e.g., S1+ with
AI1+).
3.5 Product Data
General
Number of inputs 24, configurable as:
Analog current inputs 0/4...20 mA
Digital signal inputs for proximity switches, e.g., in
accordance with EN 60947-5-6, safety proximity switches or
contacts wired with resistors
Operating voltage 24 VDC, -15...+20 %, rPP 15 %,
from a power supply unit with safe insulation,
in accordance with IEC 61131-2
Operating data 3.3 VDC / 0.3 A
24 VDC / 1.5 A
Max. permanent overload 50 mA / 10 V
max. overload duration
(short-circuit S+ →AI+)
60 ms
Data format Integer
Ambient temperature 0...+60 °C
Storage temperature -40...+85 °C
Space requirement 6 RU, 4 HP
Weight 580 g
Table 8: Product Data
Analog inputs
Inputs 24 (unipolar, non-galvanically separated)
Nominal range 0...20 mA
Operating range -1...+25 mA
Input resistance 200 
Digital resolution 12-bit
Measurement accuracy at
25 °C, max.
0.2 % of final value
Metrological accuracy on full
temperature, max.
0.5 % of final value
Temperature coefficient, max. 0.0086 %/K of final value
Safety-related accuracy, max. 1 % of final value
Measured value refresh once per F60 cycle
Sampling time approx. 45 µs per channel
Table 9: Specifications for the Analog Inputs

MI 24 01 3 Product Description
HI 800 209 E Rev. 2.00 Page 17 of 48
Analog inputs, default values
Open-circuit and
short-circuit monitoring
Freely configurable values, e.g.,
OC1) 3.6 mA (360 digits) Parameter
Threshold LOW [INT] ->
LS2) 21 mA (2100 digits) Parameter
Limit Value HIGH [INT] ->
(in accordance with NE 43)
1) OC = open-circuit
2) SC = Short-circuit
Table 10: Default Values for the Analog Inputs
Digital inputs
Inputs 24 unipolar ground I-, non-galvanically separated from one
another, analog measurement processing
Nominal range 0...20 mA, freely configurable switching threshold
Nominal input resistance 674 
Nominal short-circuit current
with proximity switch supply
12.2 mA
Delay time L →H
H →L
2 x cycle time F60
Table 11: Specifications for Digital Inputs
Digital inputs, default values
Proximity switch in
accordance with
EN 60947-5-6:
Switching threshold L →H
Switching threshold H →L
Open-circuit
Short-circuit
The values must be configured and verified for the proximity
switch in use:
1.7 mA (170 digits), parameter Hysteresis HIGH [INT] ->
1.5 mA (150 digits), parameter Hysteresis LOW [INT] ->
0.125 mA (13 digits), parameter Limit Value LOW [INT] ->
8.5 mA (850 digits), parameter Limit Value HIGH [INT] ->
Safety proximity switches in
accordance with EN 60947-5-
6:
Switching threshold L →H
Switching threshold H →L
Open-circuit
Short-circuit
The values must be configured and verified for the proximity
switch in use:
1.9 mA (190 digits), parameter Hysteresis HIGH [INT] ->
1.7 mA (170 digits), parameter Hysteresis LOW [INT] ->
0.125 mA (13 digits), parameter Limit Value LOW [INT] ->
5.5 mA (550 digits), parameter Limit Value HIGH [INT] ->
Contacts wired with resistors
(1 k/10 k):
Switching threshold L →H
Switching threshold H →L
Open-circuit
Short-circuit
The values must be configured and verified for the contact in
use:
1.7 mA (170 digits), parameter Hysteresis HIGH [INT] ->
1.5 mA (150 digits), parameter Hysteresis LOW [INT] ->
0.125 mA (13 digits), parameter Limit Value LOW [INT] ->
8.5 mA (850 digits), parameter Limit Value HIGH [INT] ->
Table 12: Default Values for the Digital Inputs

3 Product Description MI 24 01
Page 18 of 48 HI 800 209 E Rev. 2.00
Supply outputs
Nominal voltages 8.2 VDC / 26 VDC,
switchable for each group
Tolerance 5 %
Safely monitored limits
Range 8.2 V
Range 26 V
7.6...8.8 V, (tolerance range: 7.3...9.1 V)
24.3...27.7 V, (tolerance range: 24.0...28.0 V)
Current limiting > 200 mA (0 V each group)
the output is switched off
Table 13: Specifications for the Supply Outputs
3.5.1 Product Data MI 24 014
The MI 24 014 model variant is intended for use in railway applications. The electronic
components are coated with a protective lacquer.
MI 24 014
Operating temperature -25…+70 °C (temperature class T1)
Table 14: Product Data MI 24 014
The module MI 24 014 meets the conditions for vibrations and shock test according to
EN 61373, category 1, class B.

MI 24 01 4 Start-up
HI 800 209 E Rev. 2.00 Page 19 of 48
4 Start-up
To start up the controller, it must be mounted, connected and configured in the programming
tool.
4.1 Installation and Mounting
The module is mounted in the subrack of the modular HIMatrix F60 system.
When laying cables (long cables, in particular), take appropriate measures to avoid interference,
e.g., by separating the signal lines from the power lines.
When dimensioning the cables, ensure that their electrical properties have no negative impact
on the measuring circuit.
4.1.1 Mounting and Removing the Modules
To mount and remove the modules, the connection cable clamp terminals must be unplugged.
Additionally, personnel must be protected from electrostatic discharge. For details, refer to
Chapter 2.1.2.
Mounting the Modules
To mount a module into the subrack
1. Insert the module as far as it can go – without jamming it – into the two guiding rails which
are located on the housing's upper and lower part.
2. Apply pressure to the upper and lower extremity of the front plate until the module plugs
snap into the backplane socket.
3. Secure the module with the screws located on upper and lower extremity of the front plate.
The module is mounted.
Removing the Modules
To remove a module from the subrack
1. Remove the plugs from the module front plate.
2. Release the locking screws located on the upper and lower extremity of the front plate.
3. Loosen the module using the handle located on the lower part of the front plate and remove
it from the guiding rails.
The module is removed.
iThe inputs of the MI 24 01 must not be wired redundantly.
iInputs that are not being used need not be terminated. However, no open wire may be
connected.

4 Start-up MI 24 01
Page 20 of 48 HI 800 209 E Rev. 2.00
4.1.2 Analog Inputs
Only shielded cables may be connected to the analog inputs. Each analog input must be
connected to a twisted pair of wires. The shielding must be connected to the controller and the
sensor housing and earthed on one end to the controller side to form a Faraday cage.
The cable length depends on its resistor. Typically, the maximum total resistance permitted
(cable + additional resistors) is 250 :
UTC - UTmin 24 V - 14 V
RB= ————— - RE= ——————— - RE250 
Imax 21.5 mA
UTC Switch-off threshold for monitoring the transmitter supply voltage
UTmin Minimum supply voltage for the transmitters
Imax Maximum measuring current
REInput resistor of the analog input (approx. 200 )
Number of input
channels
Measurement
procedure
Current Range of values
in the application
Nominal value:
0…20 mA 0…2000
24 Unipolar 1) Operating value:
-1…24 mA -100…2500
1) Measurement with fixed ground
Table 15: Range of Values for the Analog Inputs
The analog inputs are designed to retain the metrological accuracy for 10 years. A proof test
must be performed every 10 years.