Siemens SIWAREX WP321 User Manual
SIWAREX WP321
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
Weighing systems
Electronic weighing system
SIWAREX WP321
Manual
07/2014
Introduction
1
Safety notes
2
Description
3
Application planning
4
Mounting
5
Connection
6
Commissioning
7
Scale parameters and
functions
8
Messages
9
Command lists
10
Communication in SIMATIC
S7-300/1200/1500
11
Technical data
12
Accessories
13
Appendix
A
ESD guidelines
B
List of abbreviations
C
A5E33715669A-02
Legal information
Warning notice system
DANGER
will
WARNING
may
CAUTION
NOTICE
Qualified Personnel
personnel qualified
Proper use of Siemens products
WARNING
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.
indicates that death or severe personal injury
indicates that death or severe personal injury
indicates that minor personal injury can result if proper precautions are not taken.
indicates that property damage can result if proper precautions are not taken.
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.
result if proper precautions are not taken.
result if proper precautions are not taken.
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.
Note the following:
Siemens products may only be used for the applications described in the catalog and in the relevant technical
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
ambient conditions must be complied with. The information in the relevant documentation must be observed.
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.
for the specific
Siemens AG
Division Digital Factory
Postfach 48 48
90026 NÜRNBERG
GERMANY
Order number: A5E33715669A
Ⓟ 12/2014 Subject to change
Copyright © Siemens AG 2014.
All rights reserved
Table of contents
1 Introduction ............................................................................................................................................. 9
2 Safety notes .......................................................................................................................................... 11
3 Description ............................................................................................................................................ 13
4 Application planning .............................................................................................................................. 17
5 Mounting ............................................................................................................................................... 19
6 Connection ........................................................................................................................................... 25
1.1 Purpose of the manual .............................................................................................................. 9
1.2 Basic knowledge required ......................................................................................................... 9
1.3 Manual - range of validity .......................................................................................................... 9
2.1 General safety instructions ..................................................................................................... 11
2.2 IT Security ............................................................................................................................... 12
3.1 Product overview .................................................................................................................... 13
3.2 Area of application .................................................................................................................. 13
3.3 System integration in SIMATIC ............................................................................................... 13
3.4 Customer benefits ................................................................................................................... 15
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 the SIMATIC Panel .................................................................... 18
5.1 Installation guideline ............................................................................................................... 19
5.2 EMC-compliant setup.............................................................................................................. 20
5.2.1 Introduction ............................................................................................................................. 20
5.2.2 Possible effects of interference ............................................................................................... 20
5.2.3 Coupling mechanisms............................................................................................................. 20
5.2.4 Five basic rules for securing EMC .......................................................................................... 21
5.3 Mounting on the SIMATIC ET 200SP ..................................................................................... 23
5.4 Configuration of the hardware in SIMATIC ............................................................................. 24
6.1 24 V connection ...................................................................................................................... 26
6.2 Connecting the load cells ........................................................................................................ 26
6.3 Shield connection .................................................................................................................... 28
6.4 Connection of RS485 serial interface ..................................................................................... 29
6.5 Connection of Siebert display via RS485 ............................................................................... 30
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
3
Table of contents
7 Commissioning ..................................................................................................................................... 31
8 Scale parameters and functions ............................................................................................................ 45
7.1 Factory-set parameters .......................................................................................................... 31
7.2 Commissioning tools .............................................................................................................. 31
7.3 5-minute quick start with the operator panel and the Ready-for-Use software ..................... 32
7.3.1 Start ........................................................................................................................................ 32
7.3.2 Factory setting of the parameters .......................................................................................... 33
7.3.3 Selecting the calibration method ............................................................................................ 34
7.3.4 Defining the calibration weights ............................................................................................. 35
7.3.5 Setting calibration points ........................................................................................................ 36
7.3.6 Calibrating the scale automatically ........................................................................................ 37
7.3.7 Performing the automatic calibration ..................................................................................... 38
7.3.8 Checking the scale following calibration ................................................................................ 38
7.4 5-minute quick start with SIWATOOL .................................................................................... 39
7.4.1 Activate service mode ............................................................................................................ 39
7.4.2 Load factory setting ................................................................................................................ 39
7.4.3 Input of required parameters .................................................................................................. 40
7.4.4 Complete automatic calibration .............................................................................................. 40
7.4.5 Receive all data...................................................................................................................... 41
7.4.6 Checking the scale following calibration ................................................................................ 41
7.5 Service with the SIWATOOL program ................................................................................... 42
7.5.1 Windows and functions of SIWATOOL .................................................................................. 42
7.5.2 Offline parameter assignment ................................................................................................ 43
7.5.3 Online parameter assignment ................................................................................................ 43
7.5.4 Available help options ............................................................................................................ 44
7.5.5 Entering parameters with SIWATOOL ................................................................................... 44
8.1 Parameters and functions ...................................................................................................... 45
8.2 DR 2 command code ............................................................................................................. 45
8.3 DR 3 calibration parameters .................................................................................................. 46
8.3.1 Scale name ............................................................................................................................ 48
8.3.2 Unit of weight ......................................................................................................................... 48
8.3.3 Gross identifier ....................................................................................................................... 48
8.3.4 Maximum weighing range ...................................................................................................... 49
8.3.5 Calibration weights 0, 1, 2 and calibration digits 0, 1, 2 ........................................................ 49
8.3.6 Scale interval .......................................................................................................................... 49
8.3.7 Automatic zero adjustment .................................................................................................... 49
8.3.8 Decimal places for process values ........................................................................................ 49
8.3.9 Maximum tare load ................................................................................................................ 49
8.3.10 Maximum negative zeroing limit ............................................................................................. 50
8.3.11 Maximum positive zeroing limit .............................................................................................. 50
8.3.12 Standstill range ...................................................................................................................... 51
8.3.13 Standstill time ......................................................................................................................... 51
8.3.14 Standstill waiting time ............................................................................................................ 52
8.3.15 Low-pass filter limit frequency ................................................................................................ 52
8.3.16 Low-pass filter number ........................................................................................................... 52
8.3.17 Mean value filter depth ........................................................................................................... 53
SIWAREX WP321
4 Manual, 07/2014, A5E33715669A-02
Table of contents
8.4 Calibration procedure.............................................................................................................. 54
8.4.1 Calibration with calibration weights ......................................................................................... 54
8.4.2 Automatic calibration............................................................................................................... 57
8.5 DR 4 Output of calculated calibration digits ............................................................................ 58
8.5.1 Calibration digits 0, 1, 2 (calculated) ....................................................................................... 58
8.6 DR 5 zeroing memory ............................................................................................................. 59
8.6.1 Effective tare weight - from specification ................................................................................ 60
8.6.2 Effective tare weight (semi-automatic) .................................................................................... 60
8.6.3 Zero weight (semi-automatic) ................................................................................................. 60
8.6.4 Current zero tracking weight ................................................................................................... 60
8.6.5 Dead load ................................................................................................................................ 60
8.7 DR 6 limit value settings ......................................................................................................... 61
8.7.1 Limit value 1 ON, limit value 2 ON, limit value 1 OFF, limit value 2 OFF ............................... 63
8.7.2 Limit value "Empty" ON ........................................................................................................... 63
8.7.3 Delay time for limits ................................................................................................................. 64
8.8 DR 9 module information ........................................................................................................ 65
8.9 DR 10 load cell parameters .................................................................................................... 67
8.9.1 50/60 Hz toggling .................................................................................................................... 68
8.9.2 Number of support points ....................................................................................................... 68
8.9.3 Load cell characteristic value .................................................................................................. 68
8.9.4 Rated load of a load cell ......................................................................................................... 68
8.10 DR 13 RS485 parameters ...................................................................................................... 69
8.10.1 RS485 protocol ....................................................................................................................... 70
8.10.2 RS485 baud rate ..................................................................................................................... 70
8.10.3 RS485 character parity ........................................................................................................... 70
8.10.4 Decimal place for Siebert indicator ......................................................................................... 70
8.11 DR 14 SIMATIC interface parameters .................................................................................... 71
8.11.1 Selection of process value 1, 2 ............................................................................................... 72
8.12 DR 15 manual tare specification ............................................................................................. 73
8.12.1 Specification of tare weight ..................................................................................................... 73
8.13 DR 30 current process values ................................................................................................ 74
8.13.1 Gross process weight ............................................................................................................. 76
8.13.2 Net process weight ................................................................................................................. 76
8.13.3 Tare process weight ................................................................................................................ 76
8.13.4 Gross / net weight ................................................................................................................... 76
8.13.5 Gross / net weight with increased resolution (x 10)
................................................................ 76
8.13.6 Tare weight ............................................................................................................................. 76
8.13.7 Refresh counter for process values ........................................................................................ 76
8.14 DR 31 advanced current process values ................................................................................ 77
8.14.1 Unfiltered digit value ............................................................................................................... 77
8.14.2 Filtered digit value ................................................................................................................... 77
8.14.3 Refresh counter for process values ........................................................................................ 78
8.15 DR 32 Message display .......................................................................................................... 79
8.15.1 Error bytes 0 to 7 .................................................................................................................... 81
8.16 DR 34 ASCII main display value ............................................................................................. 82
8.16.1 Content of main display as ACII string .................................................................................... 83
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
5
Table of contents
9 Messages ............................................................................................................................................. 85
10 Command lists ...................................................................................................................................... 91
11 Communication in SIMATIC S7-300/1200/1500 .................................................................................... 95
12 Technical data ..................................................................................................................................... 107
13 Accessories ......................................................................................................................................... 115
A Appendix ............................................................................................................................................. 119
B ESD guidelines .................................................................................................................................... 121
C List of abbreviations ............................................................................................................................. 123
Index ................................................................................................................................................... 125
9.1 Message types ....................................................................................................................... 85
9.2 Message paths ....................................................................................................................... 86
9.3 Evaluating messages with the help of SIWATOOL ............................................................... 86
9.4 Detecting messages with the help of FB SIWA ..................................................................... 86
9.5 Message list ........................................................................................................................... 87
9.5.1 System status message list ................................................................................................... 87
9.5.2 Technology error message list ............................................................................................... 87
9.5.3 Data and operating errors message list ................................................................................. 88
9.5.4 Messages by LEDs on the module ........................................................................................ 89
11.1 General information ............................................................................................................... 95
11.2 Structure of the program "Ready for use" .............................................................................. 95
11.3 Advantages of task sharing .................................................................................................... 96
11.4 Hardware configuration of the electronic weighing system ................................................... 97
11.5 Calling of function block ......................................................................................................... 99
11.6 Working with the function block ........................................................................................... 100
11.7 I/O interface of function block .............................................................................................. 103
11.8 Error codes of function block ............................................................................................... 103
11.9 Diagnostics messages ......................................................................................................... 104
11.10 Diagnostics interrupts .......................................................................................................... 105
11.11 Hardware interrupts ............................................................................................................. 105
12.1 Technical specifications ....................................................................................................... 107
12.2 Electrical, EMC and climatic requirements .......................................................................... 110
12.3 Approvals ............................................................................................................................. 114
A.1 Technical support ................................................................................................................. 119
B.1 ESD Guidelines .................................................................................................................... 121
C.1 List of abbreviations ............................................................................................................. 123
SIWAREX WP321
6 Manual, 07/2014, A5E33715669A-02
Table of contents
Tables
Table 6- 1 Connection of the 24 V supply ..................................................................................................... 26
Table 6- 2 Termination of RS485 serial interface.......................................................................................... 29
Table 6- 3 Settings of Siebert display S102 .................................................................................................. 30
Table 8- 1 Assignment of data record 3 ........................................................................................................ 46
Table 8- 2 Assignment of data record 4 ........................................................................................................ 58
Table 8- 3 Assignment of data record 5 ........................................................................................................ 59
Table 8- 4 Assignment of data record 6 ........................................................................................................ 61
Table 8- 5 Assignment of data record 9 ........................................................................................................ 65
Table 8- 6 Assignment of data record 10 ...................................................................................................... 67
Table 8- 7 Assignment of data record 13 ...................................................................................................... 69
Table 8- 8 Assignment of data record 14 ...................................................................................................... 71
Table 8- 9 Selection table for process value 1,2 ........................................................................................... 72
Table 8- 10 Assignment of data record 15 ...................................................................................................... 73
Table 8- 11 Assignment of data record 30 ...................................................................................................... 74
Table 8- 12 Assignment of data record 31 ...................................................................................................... 77
Table 8- 13 Assignment of data record 32 ...................................................................................................... 79
Table 8- 14 Assignment of data record 34 ...................................................................................................... 82
Table 10- 1 Command groups of the SIWAREX WP321 ................................................................................ 93
Table 11- 1 Memory requirements of the function block ................................................................................. 95
Table 11- 2 I/O data of the function block ..................................................................................................... 103
Table 11- 3 Statuses/errors when working with the function block ............................................................... 103
Table 11- 4 Diagnostics messages ............................................................................................................... 104
Table 12- 1 Interference emission (industrial area): EN 61000-6-4 .............................................................. 111
Table 12- 2 Interference immunity (industrial environment): EN 61000-6-2 ................................................. 112
Table 12- 3 Operating conditions to IEC 60721 ............................................................................................
113
Table 12- 4 Climatic requirements ................................................................................................................ 113
Table 13- 1 Essential accessories ................................................................................................................ 115
Table 13- 2 Optional accessories .................................................................................................................. 115
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
7
Table of contents
Figures
Figure 3-1 System overview .......................................................................................................................... 14
Figure 4-1 SIWATOOL overview ................................................................................................................... 18
Figure 5-1 Installation of the I/O or SIWAREX modules................................................................................ 23
Figure 6-1 SIWAREX WP321 process terminals on the base unit ................................................................ 25
Figure 6-2 Shielding in the screw gland ........................................................................................................ 27
Figure 6-3 Shield connection and shield terminal ......................................................................................... 28
Figure 6-4 Connection of Siebert display S102 ............................................................................................. 30
Figure 7-1 Quick start step 1 ......................................................................................................................... 32
Figure 7-2 Quick start step 2 ......................................................................................................................... 33
Figure 7-3 Quick start step 3 ......................................................................................................................... 34
Figure 7-4 Quick start step 4a ....................................................................................................................... 35
Figure 7-5 Quick start step 5a ....................................................................................................................... 36
Figure 7-6 Quick start step 4b ....................................................................................................................... 37
Figure 7-7 Quick start step 5b ....................................................................................................................... 38
Figure 7-8 Quick setup with marked parameters .......................................................................................... 39
Figure 7-9 Sending/receiving a data record with SIWATOOL V7 ................................................................. 40
Figure 7-10 Layout of the SIWATOOL user interface ..................................................................................... 42
Figure 8-1 Standstill monitoring ..................................................................................................................... 51
Figure 8-2 Step response of the digital low-pass filter when fg = 2 Hz ......................................................... 52
Figure 8-3 Calibration digits and calibration weight ....................................................................................... 55
Figure 8-4 Linearizing the scale's characteristic curve .................................................................................. 56
Figure 8-5 Limit value configuration .............................................................................................................. 63
Figure 11-1 Hardware configuration in the TIA Portal ..................................................................................... 97
Figure 11-2 Start address of module in TIA Portal .......................................................................................... 98
Figure 11-3 Configuration of interrupts in TIA Portal ....................................................................................... 98
Figure 11-4 HW ID of module in TIA Portal ..................................................................................................... 98
Figure 11-5
Figure 11-6 CMD command mailboxes ......................................................................................................... 100
Figure 11-7 Configuration of hardware interrupts for S7-1500 ...................................................................... 106
Figure B-1 Electrostatic voltages which an operator can be subjected to ................................................... 122
Calling of WP321DR block in user program ................................................................................ 99
SIWAREX WP321
8 Manual, 07/2014, A5E33715669A-02
1
1.1
Purpose of the manual
1.2
Basic knowledge required
1.3
Manual - range of validity
Type designation
Order No.
as of version
Note
This manual contains all the necessary information on setting up, installing, wiring and
commissioning the SIWAREX WP321 electronic weighing system.
Knowledge of weighing technology as well as general knowledge of the SIMATIC system
including the TIA Portal are necessary in order to understand the manual.
This manual is valid for:
SIWAREX WP321 7MH4138-6AA00-0BA0 HW V.1 FW V. 1.0
This manual contains a description of all electronic weighing systems available at the time
the manual was published. We reserve the right to include a Product Information with the
latest information on the module.
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
9
Introduction
1.3 Manual - range of validity
SIWAREX WP321
10 Manual, 07/2014, A5E33715669A-02
2
2.1
General safety instructions
WARNING
Non-compliance with warning notes or non-qualified handling of the system
WARNING
Permission for installation in machines
Note
itional
Note
Failure to observe the warning notes or handling of the device/system by non-qualified
personnel can result in serious injury or damage to property. This means only qualified
personnel are permitted to handle this device/system.
Start-up/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.
The specifications of the manual for the SIMATIC ET 200SP system apply for configuration,
installation and commissioning in the SIMATIC environment. This chapter includes add
information on hardware configuration, installation and preparation for operation of the
SIWAREX WP321.
The safety notes must be observed.
The device was developed, manufactured, tested and documented in compliance with the
relevant safety standards. The device does usually not pose any risks of material damage or
personal injury.
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
11
Safety notes
2.2
IT Security
2.2 IT Security
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).
SIWAREX WP321
12 Manual, 07/2014, A5E33715669A-02
3
3.1
Product overview
3.2
Area of application
3.3
System integration in SIMATIC
SIWAREX WP321 is a versatile and flexible weighing module that can be operated as a
static weighing instrument.
The electronic weighing system can be used in SIMATIC ET 200SP and uses all features of
a modern automation system, such as integrated communication, operation and monitoring,
the diagnostics system as well as the configuration tools in the TIA Portal or SIMATIC Step7
and WinCC flexible.
The electronic weighing system described here is the perfect solution for applications in
which signals from weighing or force sensors are acquired and processed. The
SIWAREX WP321 is a very accurate electronic weighing system.
It can be used in almost all industrial weighing applications not requiring official calibration.
Use in potentially explosive atmospheres (with Ex interface SIWAREX IS) it's also possible.
The electronic weighing system described here is a technology module for
SIMATIC ET 200SP. It can be used as desired in the configuration of the automation
solution, including the weighing application. You can create optimal solutions for small and
medium-sized 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.
Solutions are possible with S7-300, S7-1200 as well as S7-1500 CPUs. TIA Portal or Step 7
Classic can be used as the configuration software.
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
13
Description
3.3 System integration in SIMATIC
Figure 3-1 System overview
SIWAREX WP321
14 Manual, 07/2014, A5E33715669A-02
Description
3.4
Customer benefits
3.4 Customer benefits
The electronic weighing system described here is characterized by decisive advantages:
● Uniform design technology and consistent communication in SIMATIC ET 200SP
● Parameter assignment by means of an operator panel, STEP7 user program or PC
● Uniform configuration option in the SIMATIC TIA Portal or SIMATIC Step7
● Measuring of weight with a resolution of up to +/- 2 million parts
● High accuracy 0.05%
● High measuring rate of 100 Hz
● Limit monitoring
● Flexible adaptation to varying requirements
● Easy adjustment of the scale using the SIWATOOL program
● Automatic calibration is possible without the need for calibration weights
● Module replacement is possible without recalibrating the scale
● Use in Ex Zone 2 / ATEX approval
● Intrinsically safe load cell supply for Ex Zone 1 (SIWAREX IS option)
● Diagnostics functions
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
15
Description
3.5
Scope of delivery
Note
3.5 Scope of delivery
The scope of supply consists of the SIWAREX WP321 weighing module. Required
accessories → Accessories (Page 115)
The SIWAREX WP321 configuration package is required for configuration of the
SIWAREX WP321 electronic weighing system → Accessories (Page 115). The configuration
package is not included in the scope of delivery of the module.
SIWAREX WP321
16 Manual, 07/2014, A5E33715669A-02
4
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 WP321 is calibrated at the factory. This allows for automatic calibration of the
scale without the need for calibration weights and replacement of modules without the need
for recalibrating the scale.
A PC for setting the parameters of the electronic weighing system can be connected via the
RS485 interface.
The SIWAREX WP321 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).
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
17
Application planning
4.2
Parameter assignment options
4.2.1
Parameter assignment with the PC
4.2.2
Parameter assignment with the SIMATIC Panel
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.
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.
You require an RS485/USB converter (see Accessories (Page 115)).
SIWAREX WP321
18 Manual, 07/2014, A5E33715669A-02
SIWAREX WP321 parameters can be assigned using a SIMATIC Panel connected to the
SIMATIC CPU. The "Ready-for-use" application software is used for this.
5
5.1
Installation guideline
When assembling the SIMATIC components together with the electronic weighing system
described here, the setup, installation and wiring guidelines for the SIMATIC ET 200SP must
be observed (see system manual "SIMATIC ET 200SP, ET 200SP distributed I/O system",
order no.: A5E03576848).
This manual describes additional installation and wiring aspects specific to the electronic
weighing system.
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
19
Mounting
5.2
EMC-compliant setup
5.2.1
Introduction
EMC
5.2.2
Possible effects of interference
5.2.3
Coupling mechanisms
5.2 EMC-compliant setup
The electronic weighing system described here was developed for use in industrial
environments and complies with high EMC requirements. It ensures safe operation even in
harsh environmental conditions. 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
Interferences can impair the fault-free functioning of the electronic weighing system.
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
SIWAREX WP321
20 Manual, 07/2014, A5E33715669A-02
Mounting
5.2.4
Five basic rules for securing EMC
Rule 1: Large area grounding contact
Rule 2: Proper cable routing
Rule 3: Fixing the cable shielding
Rule 4: Special EMC measures
5.2 EMC-compliant setup
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).
● 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 lighting in the immediate range of your controller, use interference
suppressed fluorescent lamps.
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
21
Mounting
Rule 5: Homogeneous reference potential
5.2 EMC-compliant setup
● 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.
SIWAREX WP321
22 Manual, 07/2014, A5E33715669A-02
Mounting
5.3
Mounting on the SIMATIC ET 200SP
5.3 Mounting on the SIMATIC ET 200SP
The electronic weighing system described here is a module of the SIMATIC ET 200SP
series and can be directly connected to the automation system's bus system. The 15 mm
wide module has very low installation and cabling requirements.
The module is snapped onto the ET 200SP base unit (BU). You must use base units of type
A0 (→ Accessories (Page 115)).
The load cells, power supply and serial interfaces are connected via the terminal box.
Figure 5-1 Installation of the I/O or SIWAREX modules
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
23
Mounting
5.4
Configuration of the hardware in SIMATIC
5.4 Configuration of the hardware in SIMATIC
A station has a maximum width of 1 m, and you can use up to 64 modules depending on the
type of PN head-end, or up to 15 modules with the Profibus version. Observe the system
conditions when planning the configuration.
Each SIWAREX electronic weighing system requires 16 bytes of the I/O area. Address
assignment is carried out in the TIA Portal or in the SIMATIC Manager during hardware
configuration.
SIWAREX WP321
24 Manual, 07/2014, A5E33715669A-02
6
All external connections are made via the terminal box.
Figure 6-1 SIWAREX WP321 process terminals on the base unit
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
25
Connection
6.1
24 V connection
Labeling
Function
6.2
Connecting the load cells
Observe the following rules for connection of analog (DMS) load cells
6.1 24 V connection
The 24 V DC supply voltage is connected by means of the corresponding terminals on the
base unit.
Table 6- 1 Connection of the 24 V supply
L + +24 V voltage supply
M Ground voltage supply
Pickups can be connected to the SIWAREX WP321 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
The power supply for the load cells is 4.85 V.
1. The use of a junction box (SIWAREX JB junction box) is required when more than one
load cell is connected (the load cells must be connected in parallel). If the distance of a
load cell to the SIWAREX WP321 or the junction box is greater than the available length
of the load cell connection cable, use the SIWAREX EB extension box.
2. The cable shield is always applied at the cable gland of the junction box (SIWAREX JB)
or the extension box. If there is a risk of equipotential bonding through the cable shield,
connect a equipotential equalization conductor parallel to the load cell cable.
SIWAREX WP321
26 Manual, 07/2014, A5E33715669A-02
Connection
Labeling
Function
Connection pin
6.2 Connecting the load cells
3. 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 115).
4. The shield must be applied to the ground in close proximity to the SIWAREX WP321.
The maximum distance between the SIWAREX WP321 and the load cell is relevant when
you use the recommended cables.
Sig- Measurement cable load cell - 2
Sig+ Measurement cable load cell - 1
Sen- Sensor cable load cell - 4
Sen+ Sensor cable load cell + 3
Exc- Supply load cell - 6
Exc+ Supply load cell + 5
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
27
Connection
6.3
Shield connection
6.3 Shield connection
Make sure you observe the correct design of the shield support for the shielded cables. It is
the only way to ensure immunity of the system.
A cable is shielded to attenuate the effects of magnetic, electrical and electromagnetic
interference on the cable. Interference currents on cable shielding are diverted to ground by
conductive isolation rails. To avoid interference as a result of these currents, it is imperative
to provide a low-impedance connection to the ground.
Only use cables equipped with a shielding braid. Shielding density must be at least 80%.
Figure 6-3 Shield connection and shield terminal
SIWAREX WP321
28 Manual, 07/2014, A5E33715669A-02
Connection
6.4
Connection of RS485 serial interface
Labeling
Function
Connection pin
mination jumpers and in between for looping through the
mination jumpers and in between for looping through the
6.4 Connection of RS485 serial interface
The following devices can be connected to the serial interface:
● Siebert display type S102 (connections: see chapter Connection of Siebert display via
RS485 (Page 30))
● PC with RS485/USB converter (see accessories) for use of SIWATOOL
Table 6- 2 Termination of RS485 serial interface
RS485: T+ RS485 termination +:
Is used at the physical end of the bus for inserting termination jumpers
RS485: T- RS485 termination -:
Is used at the physical end of the bus for inserting termination jumpers
RS485: D+' RS485 data line +':
Is used at the physical end of the bus for inserting ter-
bus cables
RS485: D-' RS485 data line -':
Is used at the physical end of the bus for inserting ter-
bus cables
RS485: D+ RS485 data cable + 13
RS485: D- RS485 data cable - 14
9
10
11
12
If a SIWAREX WP321 module is connected to SIWATOOL or a Siebert display, insert wire
jumpers between the T+ and D+' terminals and between the T- and D-' terminals.
SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
29
Connection
6.5
Connection of Siebert display via RS485
Menu item
Setting
Meaning
485
Address
Weight value
2
0.0
----*
8.8.8
6.5 Connection of Siebert display via RS485
A Siebert display S102 with the order no. S102-W6/14/0R-000/0B-SM can be connected to
the RS485 interface of the weighing module. Connect a 24 V DC supply to the Siebert
display, and connect the latter to the RS485 interface of the weighing module as shown in
the following diagram.
Figure 6-4 Connection of Siebert display S102
The RS485 interface in the DR13 of the SIWAREX WP321 is set as follows:
● Baud rate: 9 600 bit/s
● Character parity: Even
● Number of data bits: 8
● Number of stop bits: 1
The S102 is set as follows:
Table 6- 3 Settings of Siebert display S102
1 Interface
9 Station address
t Timeout
C
F Segment test
01
RS485 interface
Address meaning:
01 Weight
02 Total
03 Net
04 Tare
e.g. timeout after 2 seconds
No decimal point
No segment test when switching on
Segment test when switching on
SIWAREX WP321
30 Manual, 07/2014, A5E33715669A-02
Loading...