Siemens SIWAREX WP241 User Manual
SIWAREX WP241
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Weighing systems
Electronic weighing system
SIWAREX WP241
Manual
04/2014
A5E33713528A
Introduction
1
Safety guidelines
2
Description
3
Application planning
4
Installation
5
Connecting
6
Commissioning
7
Scale parameters and
functions of the belt scale
8
Messages
9
Command lists
10
Communication
11
Technical specifications
12
Accessories
13
ESD guidelines
A
List of abbreviations
B
Siemens AG
Industry Sector
Postfach 48 48
90026 NÜRNBERG
GERMANY
Order number: A5E33713528A-01
Ⓟ
Copyright © Siemens AG 2014.
All rights reserved
Legal information
Warning notice system
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
Qualified Personnel
personnel qualified
Proper use of Siemens products
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
Disclaimer of Liability
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
The product/system described in this documentation may be operated only by
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
for the specific
Note the following:
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
04/2014 Subject to change
Table of contents
1 Introduction ........................................................................................................................................... 11
2 Safety guidelines ................................................................................................................................... 13
3 Description ............................................................................................................................................ 15
4 Application planning .............................................................................................................................. 17
5 Installation ............................................................................................................................................ 21
6 Connecting ........................................................................................................................................... 25
1.1 Purpose of the manual ................................................................................................................. 11
1.2 Basic knowledge required ............................................................................................................ 11
1.3 Manual - range of validity ............................................................................................................. 11
1.4 Technical support ......................................................................................................................... 11
2.1 General safety instructions .......................................................................................................... 13
3.1 Product overview.......................................................................................................................... 15
3.2 Area of application ....................................................................................................................... 15
3.3 System integration in SIMATIC .................................................................................................... 15
3.4 Customer benefits ........................................................................................................................ 16
3.5 Scope of delivery.......................................................................................................................... 16
4.1 Functions ...................................................................................................................................... 17
4.2 Parameter assignment options .................................................................................................... 18
4.2.1 Parameter assignment with the PC ............................................................................................. 18
4.2.2 Parameter assignment with a SIMATIC Panel ............................................................................ 19
4.2.3 Parameter assignment by means of the Modbus interface ......................................................... 19
5.1 Installation guideline .................................................................................................................... 21
5.2 EMC-compliant setup ................................................................................................................... 21
5.2.1 Introduction .................................................................................................................................. 21
5.2.2 Possible effects of interference .................................................................................................... 21
5.2.3 Coupling mechanisms .................................................................................................................. 22
5.2.4 Five basic rules for securing EMC ............................................................................................... 22
5.3 Mounting on the SIMATIC S7-1200 ............................................................................................. 23
6.1 Overview ...................................................................................................................................... 25
6.2 24 V connection ........................................................................................................................... 26
6.3 Connecting the load cells ............................................................................................................. 26
6.3.1 Connection of an MLC / MBS / MUS / MCS / MSI / MMI belt scale to WP241 ........................... 28
6.3.2 Connection of any scales or load cells ........................................................................................ 29
6.4 Shield connection ......................................................................................................................... 31
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Table of contents
7 Commissioning ..................................................................................................................................... 41
6.5 Connection of digital outputs (4 x DQ) ........................................................................................ 32
6.6 Connection of digital inputs (4 x DI) ............................................................................................ 33
6.7 Connection of the analog output (1 x AQ) ................................................................................... 34
6.8 Connection of RS485 serial interface ......................................................................................... 34
6.9 Connection of the Ethernet interface .......................................................................................... 35
6.10 Activation of write protection ....................................................................................................... 35
6.11 Mounting of the calibration protection plate ................................................................................ 36
6.12 Connection of a speed sensor .................................................................................................... 37
6.12.1 RBSS speed sensor on WP241 .................................................................................................. 37
6.12.2 TASS speed sensor on WP241 .................................................................................................. 38
6.12.3 WS100 speed sensor on WP241 ................................................................................................ 38
6.12.4 WS300 speed sensor on WP241 ................................................................................................ 39
7.1 Introduction.................................................................................................................................. 41
7.2 Factory-set parameters ............................................................................................................... 41
7.3 Factory setting of the mode selector ........................................................................................... 42
7.4 Commissioning tools ................................................................................................................... 42
7.5 Start-up with the operator panel and the Ready-for-Use software ............................................. 43
7.5.1 Commissioning with speed sensor ............................................................................................. 45
7.5.1.1 Specification of a pulse constant ................................................................................................ 46
7.5.1.2 Pulse constant calculation........................................................................................................... 47
7.5.2 Commissioning without speed sensor ........................................................................................ 48
7.5.2.1 Specification of a known, constant belt speed ............................................................................ 48
7.5.2.2 Determination of current belt speed (belt empty) ........................................................................ 49
7.5.2.3 Determination of current belt speed (belt loaded) ....................................................................... 50
7.5.3 External specification of a speed ................................................................................................ 52
7.5.4 Zero calibration ........................................................................................................................... 53
7.5.5 Span calibration .......................................................................................................................... 53
7.5.5.1 Span calibration by weight .......................................................................................................... 54
7.5.5.2 Span calibration by test chain ..................................................................................................... 55
7.5.5.3 Span by material batch ............................................................................................................... 56
7.5.5.4 Automatic span calibration .......................................................................................................... 57
7.5.6 Determination of a correction factor ............................................................................................ 59
7.6 Service with SIWATOOL software .............................................................................................. 61
7.6.1 Windows and functions of SIWATOOL ....................................................................................... 61
7.6.2 Offline parameter assignment ..................................................................................................... 62
7.6.3 IP address for SIWAREX ............................................................................................................ 63
7.6.3.1 Entering a known SIWAREX IP address .................................................................................... 63
7.6.3.2 Determining an unknown IP address .......................................................................................... 63
7.6.3.3 Setting up a network ................................................................................................................... 63
7.6.4 Online parameter assignment ..................................................................................................... 64
7.6.5 Available help options ................................................................................................................. 64
7.6.6 Entering parameters with SIWATOOL ........................................................................................ 65
7.6.7 Recording scale traces ................................................................................................................ 65
7.6.8 Firmware update ......................................................................................................................... 66
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8 Scale parameters and functions of the belt scale ................................................................................... 69
8.1 Parameters and functions ............................................................................................................ 69
8.2 DR 2 command code ................................................................................................................... 69
8.3 DR 3 Belt scale parameters ......................................................................................................... 70
8.3.1 Scale name .................................................................................................................................. 73
8.3.2 Code for regulations ..................................................................................................................... 73
8.3.3 Unit for belt load ........................................................................................................................... 73
8.3.4 Unit for flow rate ........................................................................................................................... 74
8.3.5 Resolution of weight and belt load ............................................................................................... 74
8.3.6 Resolution of flow rate ................................................................................................................. 74
8.3.7 Resolution of master totalizer ...................................................................................................... 75
8.3.8 Design flow rate ........................................................................................................................... 75
8.3.9 Weigh length ................................................................................................................................ 75
8.3.10 Belt length .................................................................................................................................... 75
8.3.11 Number of belt revolutions ........................................................................................................... 76
8.3.12 Speed detection ........................................................................................................................... 76
8.3.13 Design speed ............................................................................................................................... 76
8.3.14 Speed correction if belt loaded .................................................................................................... 76
8.3.15 Belt load factor for speed correction ............................................................................................ 76
8.3.16 Impulse constant speed sensor ................................................................................................... 77
8.3.17 Initial zero calibration digits .......................................................................................................... 77
8.3.18 Calibration weight......................................................................................................................... 77
8.3.19 Calibration load ............................................................................................................................ 77
8.3.20 Calibration quantity ...................................................................................................................... 78
8.3.21 Span calibration digits .................................................................................................................. 78
8.3.22 Simulation mode .......................................................................................................................... 78
8.3.23 Warm-up timer ............................................................................................................................. 78
8.3.24 Interface for the legal trade display .............................................................................................. 78
8.3.25 Software version for HMI SecureDisplay with verification capability ........................................... 79
8.3.26 Minimum display size in % of the HMI SecureDisplay with verification capability ....................... 79
8.4 Calibration procedure ................................................................................................................... 80
8.4.1 General information ..................................................................................................................... 80
8.4.2 Calibration of the speed ............................................................................................................... 81
8.4.3 Specification of known speed parameters ................................................................................... 82
8.5 Calibration of weight measurement ............................................................................................. 83
8.5.1 Determination of zero point .......................................................................................................... 83
8.5.2 Span calibration by weight ........................................................................................................... 83
8.5.3 Automatic span calibration with load cell data ............................................................................. 84
8.5.4 Span calibration by test chain ...................................................................................................... 85
8.5.5 Span calibration with known material flow ................................................................................... 86
8.6 DR 4 Temporary parameters ....................................................................................................... 87
8.6.1 Stop watch ................................................................................................................................... 89
8.6.2 Result calculator........................................................................................................................... 89
8.7 DR 5 Correction factors for material flow rate .............................................................................. 90
8.7.1 Belt load factor 1 .......................................................................................................................... 91
8.7.2 Belt load factor 2 .......................................................................................................................... 91
8.7.3 Correction factors 1 and 2 ............................................................................................................ 91
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Table of contents
8.8 DR 6 Limits .................................................................................................................................. 92
8.8.1 Negative and positive zero offset in % ........................................................................................ 94
8.8.2 Smallest totalized value .............................................................................................................. 94
8.8.3 Minimum flow rate ....................................................................................................................... 94
8.8.4 Maximum flow rate ...................................................................................................................... 94
8.8.5 Delay for flow rate limits .............................................................................................................. 94
8.8.6 Minimum belt speed .................................................................................................................... 94
8.8.7 Maximum belt speed ................................................................................................................... 94
8.8.8 Delay for belt speed limits ........................................................................................................... 95
8.8.9 Minimum belt load ....................................................................................................................... 95
8.8.10 Maximum belt load ...................................................................................................................... 95
8.8.11 Delay for belt load limits .............................................................................................................. 95
8.8.12 Medium load for totalizing ........................................................................................................... 95
8.8.13 Frequency low pass filter weight/belt load/belt speed ................................................................ 96
8.8.14 Order no low pass filter ............................................................................................................... 96
8.8.15 Depth average filter flow rate ...................................................................................................... 96
8.9 DR 7 Process interfaces ............................................................................................................. 97
8.9.1 Assignment digital input DI 0, 1, 2, 3 ........................................................................................ 100
8.9.2 Input filtering (hardware setting) ............................................................................................... 100
8.9.3 Assignment digital output DQ 0, 1, 2, 3 .................................................................................... 100
8.9.4 Response of digital outputs to faults or SIMATIC STOP .......................................................... 101
8.9.5 Substitute value for DQ 0, 1, 2, 3 following fault or SIMATIC STOP ........................................ 101
8.9.6 Analog output range .................................................................................................................. 102
8.9.7 Analog output source ................................................................................................................ 102
8.9.8 Response of analog output to faults or SIMATIC STOP ........................................................... 102
8.9.9 Start value for the analog output ............................................................................................... 102
8.9.10 End value for the analog output ................................................................................................ 103
8.9.11 Output value following fault or SIMATIC STOP ........................................................................ 103
8.9.12 Trace recording cycle ................................................................................................................ 103
8.9.13 Trace storage method ............................................................................................................... 103
8.9.14 Load per pulse .......................................................................................................................... 104
8.10 DR 8 date and time ................................................................................................................... 105
8.11 DR 9 module information .......................................................................................................... 106
8.12 DR 10 load cell parameters....................................................................................................... 107
8.12.1 Number of load cells ................................................................................................................. 108
8.12.2 50/60 Hz toggling ...................................................................................................................... 108
8.12.3 Load cell characteristic value .................................................................................................... 108
8.12.4 Rated load of a load cell ............................................................................................................ 108
8.13 DR 12 Ethernet parameters ...................................................................................................... 109
8.13.1 Device MAC address ................................................................................................................ 110
8.13.2 Port MAC address ..................................................................................................................... 110
8.13.3 IP address ................................................................................................................................. 110
8.13.4 Subnet mask ............................................................................................................................. 110
8.13.5 Gateway .................................................................................................................................... 110
8.13.6 Device name ............................................................................................................................. 110
8.14 DR 13 RS485 parameters ......................................................................................................... 111
8.14.1 RS485 protocol ......................................................................................................................... 112
8.14.2 RS485 baud rate ....................................................................................................................... 112
8.14.3 RS485 character parity ............................................................................................................. 112
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8.14.4 RS485 number of data bits ........................................................................................................ 113
8.14.5 RS485 number of stop bits ........................................................................................................ 113
8.14.6 RS485 Modbus address ............................................................................................................ 113
8.14.7 Modbus RTU response delay .................................................................................................... 113
8.15 DR 15 belt angle ........................................................................................................................ 114
8.15.1 Current belt angle....................................................................................................................... 114
8.16 DR 16 Simulation (belt speed and belt load) ............................................................................. 115
8.16.1 Value for belt load simulation ..................................................................................................... 115
8.16.2 Value for belt speed simulation .................................................................................................. 115
8.17 DR 17 Control analog output ..................................................................................................... 116
8.17.1 Analog output specification ........................................................................................................ 116
8.18 DR 18 Control digital output ....................................................................................................... 117
8.18.1 Definition for digital output DQ.0, 1, 2, 3 .................................................................................... 118
8.19 DR 19 External speed ................................................................................................................ 119
8.20 DR 20 Message configuration .................................................................................................... 120
8.21 DR 21 Calculator ........................................................................................................................ 121
8.22 DR 30 Process state .................................................................................................................. 122
8.22.1 Current weight ............................................................................................................................ 125
8.22.2 Current belt load......................................................................................................................... 125
8.22.3 Current belt load in % ................................................................................................................ 125
8.22.4 Current flow rate......................................................................................................................... 125
8.22.5 Current flow rate in % ................................................................................................................ 125
8.22.6 Current speed ............................................................................................................................ 125
8.22.7 Current speed in % .................................................................................................................... 125
8.22.8 Current master totalizer (S1) ...................................................................................................... 125
8.22.9 Current main totalizer (S2) ......................................................................................................... 126
8.22.10 Refresh counter for process values ........................................................................................... 126
8.23 DR 31 Process state extended .................................................................................................. 127
8.23.1 Unfiltered digit value .................................................................................................................. 128
8.23.2 Filtered digit value ...................................................................................................................... 128
8.23.3 Current load cell signal (mV) ...................................................................................................... 128
8.23.4 Current analog output (mA) ....................................................................................................... 129
8.23.5 Pulses per belt revolution ........................................................................................................... 129
8.23.6 Pulses per second at nominal speed ......................................................................................... 129
8.23.7 Pulses per second ..................................................................................................................... 129
8.23.8 Nominal boat load ...................................................................................................................... 129
8.23.9 Refresh counter for process values ........................................................................................... 129
8.24 DR 32 display of data and operator errors ................................................................................. 130
8.24.1 Data and operator errors, bytes 0 to 7 ....................................................................................... 132
8.24.2 Modbus RTU error code ............................................................................................................ 132
8.24.3 Modbus Ethernet error code ...................................................................................................... 132
8.24.4 SIWATOOL error code ............................................................................................................... 132
8.24.5 Error code following commands at digital input ......................................................................... 132
8.25 DR 33 Totalizers ........................................................................................................................ 133
8.25.1 Current master totalizer (S1) ...................................................................................................... 134
8.25.2 Current main totalizer (S2) ......................................................................................................... 134
8.25.3 Totalizer 3 (S3), totalizer 4 (S4), totalizer 5 (S5) ....................................................................... 134
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Table of contents
9 Messages ............................................................................................................................................ 139
10 Command lists ..................................................................................................................................... 147
11 Communication .................................................................................................................................... 153
12 Technical specifications ....................................................................................................................... 167
13 Accessories ......................................................................................................................................... 177
8.25.4 Totalizer 6 (S6) .......................................................................................................................... 134
8.26 DR 34 ASCII main display value ............................................................................................... 135
8.26.1 Content of main display as ASCII string ................................................................................... 135
8.27 DR 38 Process state extended ................................................................................................. 136
8.28 DR 48 Date and time 2 .............................................................................................................. 137
9.1 Message types .......................................................................................................................... 139
9.2 Message paths .......................................................................................................................... 139
9.3 Evaluating messages with the help of SIWATOOL .................................................................. 140
9.4 Detecting messages with the help of FB SIWA ........................................................................ 140
9.5 Message list .............................................................................................................................. 141
9.5.1 System status message list....................................................................................................... 141
9.5.2 Technology error message list .................................................................................................. 142
9.5.3 Data and operating errors message list .................................................................................... 142
9.5.4 Messages by LEDs on the module ........................................................................................... 144
10.1 Overview ................................................................................................................................... 147
10.2 Command lists .......................................................................................................................... 148
11.1 Integration in SIMATIC S7-1200 ............................................................................................... 153
11.1.1 General information ................................................................................................................... 153
11.1.2 Creating the hardware configuration ......................................................................................... 154
11.1.3 Calling of function block ............................................................................................................ 156
11.1.4 Working with the function block ................................................................................................ 157
11.1.5 I/O interface of function block.................................................................................................... 159
11.1.6 Error codes of function block..................................................................................................... 160
11.2 Communication via Modbus ...................................................................................................... 161
11.2.1 General information ................................................................................................................... 161
11.2.2 Principle of data transmission ................................................................................................... 161
11.2.3 Data record concept .................................................................................................................. 162
11.2.4 Command mailboxes ................................................................................................................ 163
11.2.5 Reading registers ...................................................................................................................... 164
11.2.6 Writing registers ........................................................................................................................ 165
12.1 Technical specifications ............................................................................................................ 167
12.2 Electrical, EMC and climatic requirements ............................................................................... 172
12.3 Approvals .................................................................................................................................. 176
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A ESD guidelines ................................................................................................................................... 179
B List of abbreviations ............................................................................................................................ 181
Index................................................................................................................................................... 183
A.1 ESD Guidelines .......................................................................................................................... 179
B.1 List of abbreviations ................................................................................................................... 181
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Table of contents
SIWAREX WP241
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1.1
Purpose of the manual
1.2
Basic knowledge required
1.3
Manual - range of validity
Type designation
Order No.
as of version
SIWAREX WP241
7MH4960-4AA01
HW V.1
FW V. 1.0.1
Note
This manual contains a description of all electronic weighing systems available at the date of
publication. We reserve the
on the module.
1.4
Technical support
Technical Support
This manual contains all necessary information on the setup, installation, wiring and
commissioning of the SIWAREX WP241 electronic weighing system.
This manual requires basic knowledge of weighing technology. When used in the
SIMATIC S7-1200, basic knowledge of the SIMATIC S7-1200 automation system and the
TIA Portal are required.
This manual is valid for:
You can contact Technical Support for weighing technology:
● E-mail (mailto:hotline.siwarex@siemens.com)
right to include a Product Information with the latest information
● Phone: +49 (721) 595-2811
SIWAREX WP241
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Introduction
Support Request:
Service & Support on the Internet
Additional Support
See also
1.4 Technical support
You can contact Technical Support for all IA and DT products:
● Via the Internet using the
Support request (http://www.siemens.com/automation/support-request)
● Phone: +49 (911) 895-7222
● Fax: +49 (911) 895-7223
Additional information about our Technical Support is available on the Internet at
Technical Support (http://www.siemens.com/automation/csi/service)
In addition to our documentation, we offer a comprehensive knowledge base online on the
Internet at:
Services & Support (http://www.siemens.com/automation/service&support)
There you will find:
● The latest product information, FAQs, downloads, tips and tricks.
● Our newsletter, providing you with the latest information about your products.
● A Knowledge Manager to find the right documents for you.
● Our bulletin board, where users and specialists share their knowledge worldwide.
● You can find your local contact partner for Industry Automation and Drives Technologies
in our partner database.
● Information about field service, repairs, spare parts and lots more under "Services".
Please contact your local Siemens representative and offices if you have any questions
about the products described in this manual and do not find the right answers.
Find your contact partner at:
Partner (http://www.automation.siemens.com/partner)
A signpost to the documentation of the various products and systems is available at:
Documentation (http://www.siemens.com/weighing/documentation)
E-mail (mailto:support.automation@siemens.com)
SIWAREX WP241
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2.1
General safety instructions
WARNING
WARNING
Note
The specifications of the manual for the SIMATIC S7
installation and commissioning in the SIMATIC environment. This chapter includes additional
information on hardware configuration, installation and preparation for operation of the
SIWAREX WP241.
The safety notes must be observed.
Note
The device was developed, manufactured, tested and documen
relevant safety standards. The device does usually not pose any risks of material damage or
personal injury.
Handling of the device/system by persons other than qualified personnel or ignoring the
warning instructions can result in severe injuries or damages. This means only qualified
personnel are permitted to handle this device/system.
Commissioning is absolutely prohibited until it has been ensured that the machine in which
the component described here is to be installed fulfills the regulations/specifications of
Machinery Directive 89/392/EEC.
-1200 system apply to configuration,
ted in compliance with the
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Safety guidelines
IT security
2.1 General safety instructions
Siemens provides automation and drive products with industrial security functions that
support the secure operation of plants or machines. They are an important component in a
holistic industrial security concept. With this in mind, our products undergo continuous
development. We therefore recommend that you keep yourself informed with respect to our
product updates. Detailed technical information can be found at:
http://support.automation.siemens.com (http://www.siemens.de/automation/csi_en_WW).
To ensure the secure operation of a plant or machine it is also necessary to take suitable
preventive action (e.g. cell protection concept) and to integrate the automation and drive
components into a state-of-the-art holistic industrial security concept for the entire plant or
machine. Products used from other manufacturers should also be taken into account here.
You will find further information under:
http://www.siemens.com/industrialsecurity (http://www.siemens.com/industrialsecurity).
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3.1
Product overview
3.2
Area of application
3.3
System integration in SIMATIC
SIWAREX WP241 is a versatile and flexible weighing module that can be operated as a belt
scale.
The electronic weighing system can be used in SIMATIC S7-1200 and uses all features of a
modern automation system, such as integrated communication, operation and monitoring,
the diagnostic system as well as the configuration tools in the TIA Portal.
Stand-alone mode without CPU is possible in addition.
The electronic weighing system described here is the perfect solution where material flows
are to be acquired and processed with the assistance of a belt scale. The SIWAREX WP241
is a very accurate electronic weighing system.
The electronic weighing system described here is a technology module for SIMATIC S7-
1200. It allows the user to configure all aspects of the automation solution, and weighing
application, to his requirements. You can create optimal solutions for small and mediumsized plants by combining the suitable SIMATIC modules. You can create customized or
industry-specific solutions in no time with the help of the configuration package available
under the "Ready for use" application for SIMATIC.
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Description
3.4
Customer benefits
3.5
Scope of delivery
Note
We recommend that you use the SIWAREX WP241 configuration package for conf
the SIWAREX WP241 electronic weighing system. The configuration package is not included
in the scope of delivery of the module:
3.4 Customer benefits
The electronic weighing system described here is characterized by decisive advantages:
● Uniform design technology and consistent communication in SIMATIC S7-1200
● Parameter assignment by means of HMI panel or PC
● Uniform configuration option in the SIMATIC TIA Portal
● Measuring of weight with a resolution of 1 million parts
● High measuring rate of 100/120 Hz (effective interference frequency suppression)
● Monitoring of a wide range of limits (material flow rate, speed, load)
● Flexible adaptation to varying requirements
● Easy adjustment of the scales using the SIWATOOL program – even without Simatic
know-how
● Exact determination of speed – with or without encoder
● Module replacement is possible without recalibrating the scales
● Use in Ex Zone 2 / ATEX approval
● Intrinsically safe load cell supply for Ex Zone 1 (SIWAREX IS option)
● Diagnostics functions
The scope of delivery only includes the SIWAREX WP241 weighing module.
iguring
→ Accessories (Page 177).
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4.1
Functions
P
The primary task of the electronic weighing system is the measurement and registration of
the current weight value. The integration in SIMATIC gives you the option to process the
weight value directly in the PLC (
The SIWAREX WP241 is calibrated at the factory. This allows for automatic calibration of the
scales without the need for calibration weights and replacement of modules without the need
for recalibrating the scales.
The Ethernet interface can be used to connect a PC for parameter assignment of the
electronic weighing system or for connection to any automation system (Modbus TCP/IP).
The SIWAREX WP241 electronic weighing system can also be used in potentially explosive
atmospheres (Zone 2). The load cells are supplied intrinsically safe in Zone 1 applications
when you use the optional Ex interface SIWAREX IS.
rogrammabelLogic Controller).
The SIWAREX WP241 can also be used in stand-alone mode independent of the
automation system. There are many configuration options in this case.
The user can select the enclosure as well as the Operator Panel. But the Operator Panel
must support Modbus RTU or TCP/IP. This means you can implement your own operating
philosophy.
The SIWAREX WP241 can be controlled remotely without its own operator panel on site.
One Operator Panel can be used for several scales. The configuration options are almost
unlimited in this case.
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Application planning
4.2
Parameter assignment options
4.2.1
Parameter assignment with the PC
4.2 Parameter assignment options
You can set the scale parameters with the convenience of the familiar Windows interface by
using the "SIWATOOL" PC parameter assignment software. The connection is made using
the Ethernet port of the electronic weighing system and the standard network port of the PC.
You can use the program for commissioning the scale without any knowledge of automation
technology. When servicing is required, you can analyze and test the processes in the scale
independently of the automation system or Operator Panel with the help of the PC. You can
read out the diagnostic buffer from the SIWAREX module to assist you in the event analysis.
The figure below illustrates the structure of the individual program windows.
Figure 4-1 SIWATOOL overview
SIWATOOL does not only offer support when you set the scale but also when you analyze
the diagnostic buffer that can be saved after being read out of the module together with the
parameters. The display of the current scale status can be configured.
You can switch between several languages in the program.
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Application planning
4.2.2
Parameter assignment with a SIMATIC Panel
4.2.3
Parameter assignment by means of the Modbus interface
4.2 Parameter assignment options
All parameters can be assigned and the module put into operation using a SIMATIC HMI
Panel connected to the S7-1200 CPU and the SIWAREX WP241 function and data blocks.
The Ready-for-Use software is included in the scope of delivery of the configuration
package. This includes the STEP 7 program for the CPU and the HMI project for scale
visualization. Further information on integration in the TIA Portal can be found in chapter
→ Integration in SIMATIC S7-1200 (Page 153).
You have the option to assign the parameters with a SIMATIC panel which is connected
directly to the SIWAREX module. The SIWAREX module behaves like a Modbus slave in
this case. Loadable HMI software for a SIMATIC Panel TP700 Comfort is provided in the
scope of delivery of the configuration package.
All SIMATIC HMI Comfort Panels can be used for direct Modbus communication. The use of
SIMATIC HMI Basic Panels is not possible at the moment. A direct connection between a
SIMATIC HMI Panel and SIWAREX WP241 by means of Modbus RTU has not been
approved.
The parameters for the SIWAREX module can also be prepared in a third-party system and
transmitted to the electronic weighing system by means of Modbus RTU or TCP/IP. Detailed
information on assignment of the holding registers can be found in chapter → Scale
parameters and functions of the belt scale (Page 69).
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Application planning
4.2 Parameter assignment options
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5
5.1
Installation guideline
5.2
EMC-compliant setup
5.2.1
Introduction
EMC
5.2.2
Possible effects of interference
When installing the SIMATIC components together with the electronic weighing system
described here, the setup, installation and wiring guidelines for the SIMATIC S7-1200 must
be observed (see system manual "SIMATIC S7 S7-1200 automation system", order no.:
A5E02486681).
This manual describes additional installation and wiring aspects specific to the electronic
weighing system.
The electronic weighing system described here was developed for use in industrial
environments and complies with high EMC requirements. Nevertheless, you should still carry
out EMC planning before installing your devices in order to determine any sources of
interference and include them in your considerations.
EMC (electromagnetic compatibility) describes the capability of electrical equipment to
operate without errors in a given electromagnetic environment, without being subject to
external influence and without influencing external devices in any way.
Electromagnetic interferences can influence the electronic weighing system described here
in various ways:
● Electromagnetic fields having a direct influence on the system
● Interferences transported by communication cables
● Interferences having an effect via process cables
● Interferences entering the system via the power supply and/or protective ground
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Interferences can impair the fault-free functioning of the electronic weighing system.
21
Installation
5.2.3
Coupling mechanisms
5.2.4
Five basic rules for securing EMC
Rule 1: Large area grounding contact
Rule 2: Proper cable routing
5.2 EMC-compliant setup
Depending on the propagation medium (conducted or non-conducted) and the distance
between the interference source and the device, interferences can enter the faulty device
through four different coupling mechanisms:
● Electrical coupling
● Capacitive coupling
● Inductive coupling
● Radiation coupling
Observe these five basic rules to secure EMC.
● When installing the devices, make sure that the surfaces of inactive metal parts are
properly bonded to chassis ground (see following sections).
● Bond all inactive metal parts to chassis ground, ensuring large area and low-impedance
contact (large cross-sections).
● When using screw connections on varnished or anodized metal parts, support contact
with special contact washers or remove the protective insulating finish on the points of
contact.
● Wherever possible, avoid the use of aluminum parts for ground bonding. Aluminum
oxidizes very easily and is therefore less suitable for ground bonding.
● Provide a central connection between chassis ground and the ground/protective
conductor system.
● Organize your wiring system into cable groups (high-voltage/power
supply/signal/measurement/data cables).
● Always route high-voltage and data cables in separate ducts or in separate bundles.
● Install the measurement cables as close as possible to grounded surfaces (e.g.
supporting beans, metal rails, steel cabinet walls).
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Installation
Rule 3: Fixing the cable shielding
Rule 4: Special EMC measures
Rule 5: Homogeneous reference potential
5.3
Mounting on the SIMATIC S7-1200
5.3 Mounting on the SIMATIC S7-1200
● Ensure proper fixation of the cable shielding.
● Always use shielded data cables. Always connect both ends of the data cable shielding to
ground on a large area.
● Keep unshielded cable ends as short as possible.
● Always use metal/metalized connector housings only for shielded data cables.
● All inductors that are to be controlled should be connected with suppressors.
● For cabinet or enclosure lighting in the immediate range of your controller, use
incandescent lamps or interference suppressed fluorescent lamps.
● Create a homogeneous reference potential and ground all electrical equipment.
● Use sufficiently dimensioned equipotential bonding conductors if potential differences
exist or are expected between your system components. Equipotential bonding is
absolutely mandatory for applications in hazardous areas.
The electronic weighing system described here is a SIMATIC S7-1200 module and can be
directly connected to the automation system's bus system. The 70 mm wide module has very
low installation and cabling requirements.
The module is fitted on a mounting rail, and the bus connection made using the slide switch.
The load cells, power supply and serial interfaces are connected via the screw-type
connectors.
Use of the WP241 in the SIMATIC TIA Portal is described in detail in chapter 11 of this
manual: → Integration in SIMATIC S7-1200 (Page 153)
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Installation
5.3 Mounting on the SIMATIC S7-1200
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6
6.1
Overview
①
24 V connection
⑥
Digital input connection
②
Analog output connection
⑦
Ethernet interface connection
③
Load cell connection
⑧
Calibration bridge connection
④
⑨
protection plate
⑤
Digital output connection
All external connections (with the exception of the Ethernet interface) are made by means of
the screw connectors (terminal block 1 to 4).
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RS485 interface connection
Figure 6-1 SIWAREX WP241 connection areas
Mounting terminals for the calibration
25
Connecting
6.2
24 V connection
Labeling
Function
L +
+24 V voltage supply
M
Ground voltage supply
6.3
Connecting the load cells
Overview
6.2 24 V connection
The 24 V DC supply voltage is connected by means of the corresponding terminals on the
electronic weighing system.
Table 6- 1 Connection of the 24 V supply
Pickups can be connected to the SIWAREX WP241 electronic weighing system which are
equipped with strain gauges (full bridge) and meet the following requirements.
● Characteristic value 1 to 4 mV/V
● A supply voltage of 5 V is permitted
● Maximum cable length between WP241 and junction box 1 000 m
The power supply for the load cells is 4.85 V.
The following condition must be satisfied in order to check the maximum possible number of
load cells which can be connected to a WP241:
● Scale operation without Ex interface: (input resistance of load cell) / (number of load cells)
> 40 Ohm
● Scale operation without Ex interface: (input resistance of load cell) / (number of load cells)
> 50 Ohm
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Connecting
Rules
Observe the following rules when connecting analog (strain gauge) load cells:
Labeling
Function
Sig-
Measurement cable load cell -
Sig+
Measurement cable load cell -
Sen-
Sensor cable load cell -
Sen+
Sensor cable load cell +
Exc-
Supply load cell -
Exc+
Supply load cell +
6.3 Connecting the load cells
The load cells fitted in the belt scale are connected in parallel in a junction box (e.g.
SIWAREX JB). Use a well-shielded cable for the connection between junction box and
SIWAREX WP241 (see SIWAREX cables → Accessories (Page 177)).
1. The cable shield is always applied at the cable gland of the junction box (SIWAREX JB).
If there is a risk of equipotential bonding through the cable shield, connect an
equipotential bonding conductor parallel to the load cell cable.
2. Twisted wire pairs that are also shielded are required for the specified cables:
– Sensor cable (+) and (-)
– Measuring voltage cable (+) and (-)
– Supply voltage cable (+) and (-)
Figure 6-2 Shielding in the screw gland
We recommended that you use the cables listed in chapter → Accessories (Page 177).
3. The shield must be connected to ground directly in the vicinity of the SIWAREX WP241.
The maximum distance between the SIWAREX WP241 and the load cell applies when
using the recommended cables (see SIWAREX cables → Accessories (Page 177)).
Table 6- 2 Load cell connections on the module
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Connecting
6.3.1
Connection of an MLC / MBS / MUS / MCS / MSI / MMI belt scale to WP241
6.3 Connecting the load cells
The following graphic clarifies the interfacing of all Siemens belt scale types to SIWAREX
WP241. When using several MSI scales (MMI2 or MMI3) installed in sequence, all additional
load cells are connected in parallel in the junction box as shown in the graphic.
All load cells must always be connected in parallel in the junction box. With 4-wire load cells,
you must additionally set a jumper between EXC- and SEN- and between EXC+ and SEN+
in the junction box. With 6-wire load cells, the jumpers are omitted and all conductors of the
same type are connected in parallel in the junction box and directly through to the
SIWAREX.
Figure 6-3 Siemens belt scales on WP241
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Connecting
6.3.2
Connection of any scales or load cells
6.3 Connecting the load cells
Figure 6-4 Connection of 4-wire load cells to WP241
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Connecting
6.3 Connecting the load cells
Figure 6-5 Connection of 6-wire load cells to WP241
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