HIMA HIMatrix MI 24 01 User manual

HIMatrix
Safety-Related Controller
MI 24 01 Manual
HIMA Paul Hildebrandt GmbH + Co KG
Industrial Automation
Rev. 1.00 HI 800 209 E

HI 800 209 E Rev. 1.00 (1014)
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.
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 CD-ROM and our website http://www.hima.de and
http://www.hima.com.
© Copyright 2010, HIMA Paul Hildebrandt GmbH + Co KG
All rights reserved
Contact
HIMA Address
HIMA Paul Hildebrandt GmbH + Co KG
P.O. Box 1261
68777 Brühl, Germany
Tel: [phone]
Fax: [phone]
E-mail: [email protected]
Type of Change
Revision
index
Revisions
technical editorial
1.00 Added: Configuration with SILworX X X

MI 24 01 Table of Contents
HI 800 209 E Rev. 1.00 Page 3 of 50
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 Assembly.............................................................................................................. 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
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 Mounting the MI 24 01 in Zone 2 ........................................................................... 26
4.1.7 Power Dissipation of the MI 24 01 ......................................................................... 27
4.1.7.1 Connecting an Active Transmitter.......................................................................... 27
4.1.7.2 Connecting a Passive Transmitter ......................................................................... 27
4.1.7.3 Connecting Proximity Switches (Contact Wired with Resistors) ............................ 27

Table of Contents MI 24 01
Page 4 of 50 HI 800 209 E Rev. 1.00
4.2 Configuration........................................................................................................28
4.2.1 Module Slots...........................................................................................................28
4.2.2 Line Control ............................................................................................................28
4.3 Configuring a Module 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 Module Tab:...........................................................................................................30
4.3.2.2 MI 24 01_1: Channels Tab....................................................................................31
4.4 Configuring a Module Using 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........................................................................................40
6.2.1 Loading the Operating System...............................................................................40
6.2.2 Proof Test...............................................................................................................40
7Decommissioning.................................................. 41
8Transport .............................................................. 42
9Disposal................................................................ 43
Appendix............................................................... 45
Glossary................................................................................................................45
Index of Figures....................................................................................................46
Index of Tables .....................................................................................................47
Index......................................................................................................................48

MI 24 01 1 Introduction
HI 800 209 E Rev. 1.00 Page 5 of 50
1 Introduction
This manual describes the technical characteristics of the module and its use. It also
includes instructions on how to install, start up and replace it.
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
This manual distinguishes between the following variants of the HIMatrix system:
Programming tool Processor operating system Communication operating
system
SILworX Version 7 and beyond Version 12 and beyond
ELOP II Factory Versions prior to 7 Versions prior to 12
Table 1: HIMatrix System Variants
The manual distinguishes among the different variants using:
Separated chapters
Tables differentiating among the versions, e.g., version 7 and beyond, or prior to
version 7
iProjects created with ELOP II Factory cannot be edited with SILworX, and vice versa!
iThis manual usually refers to compact controllers and remote I/Os as devices, and to the
plug-in cards of a modular controller as modules.

1 Introduction MI 24 01
Page 6 of 50 HI 800 209 E Rev. 1.00
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 Engineering
Manual
Project planning description for
HIMatrix systems
HI 800 101 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,
INTERBUS protocol
-
First Steps
SILworX
Introduction to SILworX using the
HIMax system as an example
HI 801 103 E
First Steps
ELOP II Factory
Introduction to ELOP II Factory HI 800 006 E
Table 2: Additional Relevant Documents
The latest manuals can be downloaded from the HIMA website 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. 1.00 Page 7 of 50
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: danger, warning, caution, notice
Type and source of danger
Consequences arising from the danger
Danger prevention
The signal words have the following meanings:
Danger indicates hazardous situation which, if not avoided, will result in death or serious
injury.
Warning indicates hazardous situation which, if not avoided, could result in death or
serious injury.
Warning 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 danger!
Consequences arising from the danger
Danger prevention

1 Introduction MI 24 01
Page 8 of 50 HI 800 209 E Rev. 1.00
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. 1.00 Page 9 of 50
2 Safety
The following safety information, notes and instructions 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 danger 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
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
Enclosure Standard: IP20
Supply voltage 24 VDC
Table 3: Environmental Requirements
Exposing the HIMax 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 50 HI 800 209 E Rev. 1.00
2.2 Residual Risk
No imminent danger results from a HIMatrix system itself.
Residual risk may result from:
Faults in the engineering
Faults in the user program
Faults in 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 site adopts 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. 1.00 Page 11 of 50
3 Product Description
MI 24 01 is a plug-in 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).
i
A
nalog 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 as many times as required. Slots
1 and 2 are reserved for the power supply module and CPU 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 (EN 954-1) and PL e (EN ISO 13849-1). Further
safety standards, application standards and test standards are specified in the certificate
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 module detects a fault on an analog input, the AI.Error Code system parameter > 0 is
set. In case of module faults, the Mod. Error Code system parameter > 0 is set.
In both cases, the device activates the ERR LED.
In addition to the analog value 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 FAULT 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 50 HI 800 209 E Rev. 1.00
3.2 Equipment, Scope of Delivery
The H 7032 and the H 7033 are not included within the scope of delivery of MI 24 01.
The following list specifies the available components and the corresponding part numbers:
Designation Description Part no.
MI 24 01 Plug-in module with 24 analog inputs or inputs for
proximity switches
98 2200115
H 7032 Filter and protective module for connecting
two-wire transmitters to the HIMatrix MI 24 up to SIL 3.
99 4703202
H 7033 Filter and protective module for connecting
three-wire transmitters to the HIMatrix MI 24 up to SIL 3.
99 4703302
Table 4: Part Numbers
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. 1.00 Page 13 of 50
3.4 Assembly
This chapter describes the layout and function of the plug-in 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 50 HI 800 209 E Rev. 1.00
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. 1.00 Page 15 of 50
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 low 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 seconds, the supply is switched on again. If the
overload is still present after 30 seconds, the module attempts to restart the supply in
intervals of 60 seconds.
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 seconds. 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.

3 Product Description MI 24 01
Page 16 of 50 HI 800 209 E Rev. 1.00
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.
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 %, wss ≤15 %,
provided by a power supply unit with safe isolation
in accordance with IEC 61131-2 requirements.
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 °C...+60 °C
Storage temperature -40 °C...+85 °C
Space requirement 6 RU, 4 HP
Weight 580 g
Table 8: Product Data

MI 24 01 3 Product Description
HI 800 209 E Rev. 1.00 Page 17 of 50
Analog Inputs
Inputs 24 (unipolar, non-galvanically isolated)
Nominal range 0...20 mA
Operating range -1...25 mA
Input resistance 200 Ω
Digital resolution 12-bit
Measurement accuracy at
25 °C, max.
±0.2 % of final value
Measurement accuracy on
full temperature range, 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
Analog inputs, default values
Open-circuit and
short-circuit monitoring
Freely configurable values, e.g.,
LB1) 3.6 mA (360 digits) Parameter
Limit Value LOW [INT] ->
LS2) 21 mA (2100 digits) Parameter
Limit Value HIGH [INT] ->
(in accordance with NE 43)
1) LB = open-circuit
2) LS = Short-circuit
Table 10: Default Values for the Analog Inputs
Digital Inputs
Inputs 24 unipolar ground I-,
non-galvanically isolated from one another,
analog measurement processing
Nominal range 0...20 mA, freely configurable switching threshold
Nominal input resistance 674 Ω
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

3 Product Description MI 24 01
Page 18 of 50 HI 800 209 E Rev. 1.00
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
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 V...8.8 V, (tolerance range: 7.3...9.1 V)
24.3 V...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

MI 24 01 4 Start-Up
HI 800 209 E Rev. 1.00 Page 19 of 50
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.
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 rack
1. Insert the module as far as it can go – without jamming it – into the two guiding rails
which are located on the upper and lower part of the enclosure.
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 rack
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 50 HI 800 209 E Rev. 1.00
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 Ω:
UTC - UTmin 24 V - 14 V
RB= ————— - RE= ——————— - RE≈250 Ω
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
RE Input resistor of the analog input (approx. 200 Ω)
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 14: Range of Values for the Analog Inputs
The analog inputs are designed to retain the metrological accuracy for 10 years. A
recalibration must be carried out every 10 years.