Endress+Hauser WirelessHART Fieldgate SWG70 User manual

BA064S/04/en/06.10
Version 1.00.xx
71117959
Operating Instructions
WirelessHART Fieldgate SWG70
Intelligent WirelessHART gateway
with Ethernet and RS-485 interfaces

WirelessHART Fieldgate SWG70 Table of Contents
Endress+Hauser 1
Table of Contents
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Registered Trademarks . . . . . . . . . . . . . . . . . . . . . . 3
1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Installation, commissioning and operation . . . . . . . . 4
1.3 Operational safety . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Conformance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Technical improvement . . . . . . . . . . . . . . . . . . . . . . 5
1.6 Conventions and icons . . . . . . . . . . . . . . . . . . . . . . 6
2 Identification . . . . . . . . . . . . . . . . . . . . 7
2.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1 Visual inspection . . . . . . . . . . . . . . . . . . . . . 7
2.1.2 Scope of delivery . . . . . . . . . . . . . . . . . . . . . 7
2.1.3 Storage und transport . . . . . . . . . . . . . . . . . 7
2.2 Device designation . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Licensing agreement . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Function and System Design . . . . . . . . 9
3.1 WirelessHART protocol . . . . . . . . . . . . . . . . . . . . . . 9
3.2 WirelessHART network . . . . . . . . . . . . . . . . . . . . . 10
3.2.1 Network management . . . . . . . . . . . . . . . . 10
3.2.2 Security management . . . . . . . . . . . . . . . . 10
3.3 Connection to host applications . . . . . . . . . . . . . . . 11
3.3.1 Instrument List . . . . . . . . . . . . . . . . . . . . . 11
3.3.2 Caché . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Mechanical Installation . . . . . . . . . . . 13
4.1 Mounting considerations . . . . . . . . . . . . . . . . . . . . 13
4.1.1 Positioning the Fieldgate . . . . . . . . . . . . . . 13
4.1.2 Positioning and connecting a remote
antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.3 Antenna characteristics . . . . . . . . . . . . . . . 14
4.1.4 Antenna range . . . . . . . . . . . . . . . . . . . . . . 15
4.1.5 Examples for good and poor positioning . . . 16
4.2 Mounting the Fieldgate . . . . . . . . . . . . . . . . . . . . . 17
5 Electrical Installation . . . . . . . . . . . . . 18
5.1 Connections and interfaces . . . . . . . . . . . . . . . . . . 18
5.2 Connecting to power supply and grounding . . . . . . 19
5.3 Connecting to Ethernet . . . . . . . . . . . . . . . . . . . . . 20
5.4 Connecting to RS-485 . . . . . . . . . . . . . . . . . . . . . . 21
5.5 Cable glands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6 Operation . . . . . . . . . . . . . . . . . . . . . 23
6.1 Operating and display elements . . . . . . . . . . . . . . . 23
6.1.1 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.1.2 Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1.3 DIP switches . . . . . . . . . . . . . . . . . . . . . . . 26
7 Commissioning . . . . . . . . . . . . . . . . . 27
7.1 Preliminaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1.1 Software package . . . . . . . . . . . . . . . . . . . . 27
7.1.2 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.2 Ethernet connection . . . . . . . . . . . . . . . . . . . . . . . 28
7.2.1 Changing the IP address . . . . . . . . . . . . . . . 28
7.2.2 Check the connection . . . . . . . . . . . . . . . . 29
7.3 RS-485 connection . . . . . . . . . . . . . . . . . . . . . . . . 30
7.4 Installing FieldCare . . . . . . . . . . . . . . . . . . . . . . . . 31
7.4.1 Installing the Fieldgate DTM/HART IP
CommDTM . . . . . . . . . . . . . . . . . . . . . . . . 31
7.4.2 Update the FieldCare DTM catalog . . . . . . 32
7.5 Create a FieldCare Project . . . . . . . . . . . . . . . . . . . 33
7.5.1 Add the HART IP CommDTM . . . . . . . . . . 33
7.5.2 Add the Fieldgate SWG70 . . . . . . . . . . . . . 34
7.5.3 Parameterize Fieldgate SWG70 . . . . . . . . . 35
7.5.4 Scan for wireless devices in the network . . 36
7.5.5 Scan for devices connected to adapters . . . . 37
8 Fieldgate Configuration . . . . . . . . . . 38
8.1 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.2 Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.3 Wireless Communication . . . . . . . . . . . . . . . . . . . . 40
8.3.1 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.3.2 Instrument List . . . . . . . . . . . . . . . . . . . . . 41
8.3.3 Burst Lists . . . . . . . . . . . . . . . . . . . . . . . . . 42
8.4 Wired Communication . . . . . . . . . . . . . . . . . . . . . 43
8.4.1 Serial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.4.2 Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . 44
8.4.3 HART . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
8.4.4 Modbus . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8.5 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
8.5.1 Identification . . . . . . . . . . . . . . . . . . . . . . . 48
8.5.2 Wireless Communication . . . . . . . . . . . . . . 49
8.5.3 Wired Communication . . . . . . . . . . . . . . . 50
8.6 Additional Functions . . . . . . . . . . . . . . . . . . . . . . . 52
8.6.1 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
8.6.2 About . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
8.6.3 Firmware Update (Web Server) . . . . . . . . . 53
8.6.4 Change Password (Web Server) . . . . . . . . . 54
8.6.5 Self Test (DTM) . . . . . . . . . . . . . . . . . . . . . 54
8.6.6 Set DTM Addresses (DTM) . . . . . . . . . . . . . 55
8.6.7 Set Device Addresses (DTM). . . . . . . . . . . . 55
8.6.8 Backup Instrument List (DTM) . . . . . . . . . . 56
9 HART OPC Interface . . . . . . . . . . . . 58
9.1 HART OPC server . . . . . . . . . . . . . . . . . . . . . . . . . 58
9.2 Creating an Ethernet network . . . . . . . . . . . . . . . . 58
9.3 Viewing and editing device properties . . . . . . . . . . 62
9.3.1 Fieldgate properties . . . . . . . . . . . . . . . . . . 62
9.3.2 Adapter properties . . . . . . . . . . . . . . . . . . . 63
9.3.3 Device properties . . . . . . . . . . . . . . . . . . . . 64
9.3.4 Device data . . . . . . . . . . . . . . . . . . . . . . . . 69
9.4 OPC client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Table of Contents WirelessHART Fieldgate SWG70
2Endress+Hauser
10 Modbus Interface . . . . . . . . . . . . . . . 72
10.1 Modbus mapping . . . . . . . . . . . . . . . . . . . . . . . . . 72
10.1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . 72
10.1.2 Mapping rules . . . . . . . . . . . . . . . . . . . . . 72
10.1.3 Dynamic variable mapping format . . . . . . . 73
10.1.4 Status mapping format . . . . . . . . . . . . . . . 73
11 Maintenance and Repair . . . . . . . . . . 74
11.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
11.1.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . 74
11.1.2 Return to Endress+Hauser. . . . . . . . . . . . . 74
11.1.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . 74
11.1.4 Contact addresses . . . . . . . . . . . . . . . . . . . 74
12 Trouble-Shooting . . . . . . . . . . . . . . . . 75
12.1 Network optimization . . . . . . . . . . . . . . . . . . . . . . 75
12.1.1 Verify Connections . . . . . . . . . . . . . . . . . . 75
12.1.2 Eliminate Bottlenecks . . . . . . . . . . . . . . . . 75
12.1.3 Expand the Network . . . . . . . . . . . . . . . . 76
12.1.4 Optimize Coexistence with other
Wireless Networks . . . . . . . . . . . . . . . . . . 76
12.2 Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
12.2.1 Faults indicated by Fieldgate LEDS . . . . . . 77
12.2.2 Wired Communcation Faults . . . . . . . . . . 77
12.2.3 Wireless Communication Faults . . . . . . . . 78
13 Technical Data . . . . . . . . . . . . . . . . . 79
13.1 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
13.2 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
13.2.1 Ethernet (10 BASE-T/10 BASE TX) . . . . . 79
13.2.2 RS-485 serial interface . . . . . . . . . . . . . . . 79
13.3 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
13.4 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
13.5 Mechanical Construction . . . . . . . . . . . . . . . . . . . 81
13.6 Operability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
13.7 Certificates and Approvals . . . . . . . . . . . . . . . . . . . 82
Index . . . . . . . . . . . . . . . . . . . . . . . . . 84

WirelessHART Fieldgate SWG70
Endress+Hauser 3
Revision History
Registered Trademarks
HART®, WirelessHART®
Registered trademark of the HART Communication Foundation, Austen/TX, USA
Microsoft®, Windows® , Windows 2000®,Windows XP®,Windows 2003 Server®, Windows
Vista®and the Microsoft logo are registered trademarks of the Microsoft Corporation.
Acrobat Reader®is a registered trade mark of the Adobe Systems Incorporated.
All other brand and product names are trademarks or registered trademarks of the companies and
organisations in question
Package
version
Manual Changes Remarks
1.00.xx BA064S/04/en/09.09 – Original manual

1Safety WirelessHART Fieldgate SWG70
4Endress+Hauser
1Safety
1.1 Designated use
Fieldgate SWG70 serves as a gateway device for WirelessHART networks. It enables WirelessHART
devices to communicate with each other and manages security and connectivity. The Fieldgate
converts wireless device data to a format that is compatible with host systems.
1.2 Installation, commissioning and operation
Fieldgate SWG70 has been designed to operate safely in accordance with current technical safety
and EU directives.
If the fieldgate is installed incorrectly or used for applications for which it is not intended, or if the
fieldgate is not configured correctly, it is possible that dangers may arise. For this reason, the system
must be transported, stored, installed, connected, configured, operated and maintained according
to the instructions in this and the associated manuals: personnel must be authorised and suitably
qualified.
1.3 Operational safety
Location Fieldgate SWG70 fulfils the requirements of EU Guidelines for a number of applications. The
associated environmental conditions described in Chapter 11, Technical Data, must be upheld.
The device must not be installed at locations where corrosive vapors may be present.
Hazardous areas Fieldgate SWG70 is available in a version that can be mounted in an explosion hazardous area. In
order to ensure the necessary degree of protection:
• All seals must be undamaged and have been correctly fitted
• All screws of the housing / housing cover must have been tightened with the appropriate
torque
• Only cable of the appropriate size must be used in the cable glands
• All cable glands must have been tightened with the appropriate torque, see Chapter 5.5
• All empty cable glands must have been sealed with sealing plugs
When installing components in explosion hazardous areas:
• Ensure that all installation and maintenance personnel are suitably qualified
• Check that all equipment has the appropriate safety certificates
• Observe the specifications in the device certificates as well as national and local regulations.
If devices have already been operated in general electrical systems, they may subsequently no longer
be installed in electrical systems used in combination with hazardous areas.
Maintenance Fieldgate SWG70 may not be repaired, changed or manipulated. If there is a defect, the product
must always be replaced with an original part.
Coexistence of wireless
technologies
WirelessHART networks use the frequency spectrum between 2400 ... 2483.5 MHz according to
IEEE 802.15.4. Various other wireless technologies also use this frequency spectrum, for example
WLAN and Bluetooth. Depending upon the situation, it is possible that these different wireless
technologies will affect each other.
When wireless technologies are used in an industrial environment, they must coexist without
disrupting each other. If you find that systems are interfering with each other, take appropriate
measures to ensure the operation of all wireless systems, e.g. by reconfiguring, enforcing a wireless
compatibility policy, etc.

WirelessHART Fieldgate SWG70 1Safety
Endress+Hauser 5
1.4 Conformance
All declarations of conformity are to be found on the accompanying CD ROM in the folder
Fieldgate SWG70=>Documentation=>Certificates.
CE Mark In attaching the CE Mark, Endress+Hauser confirms that Fieldgate SWG70 conforms to all relevant
EU directives. Declarations of conformity are available for both Ex and Non-Ex versions.
EMC All modules are suitable for industrial use and conform to the EU Electromagnetic Compatibility
Directive 2004/108/EC:
• Interference emmision
EN 61326-1: 2006, Class A apparatus
• Interference immunity
EN 61326-1: 2006, industrial environment
R&TTE compliance This device complies with the requirements of the EC Telecommunications Directive 1999/5/EC
• ETSI EN 300 328: V1.7.1 (2006-10)
• ETSI EN 301 489-17: V1.2.1 (2002-08)
• EN 60950: 2001
FCC compliance This device complies with CFR 47, Part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) This device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.
#Warning!
• When the device is in operation, a distance of at least 20 cm must be maintained at all times
between the device antenna and the body of the user or any other person within the vicinity of
the measuring point irrespective of application or use
"Caution!
• Changes or modifications to the Fieldgate not expressly approved by the Endress+Hauser will void
the user’s authority to operate the equipment.
1.5 Technical improvement
Endress+Hauser reserves the right to make technical improvements to its software and equipment
at any time and without prior notification. Where such improvements have no effect on the
operation of the equipment, they are not documentated. If the improvements effect operation, a
new version of the operating instructions is normally issued.

1Safety WirelessHART Fieldgate SWG70
6Endress+Hauser
1.6 Conventions and icons
In order to highlight safety relevant or alternative operating procedures in the manual, the following
conventions have been used, each indicated by a corresponding icon in the margin.
Safety conventions .
Explosion protection .
Electrical symbols .
Icon Meaning
Note!
A note highlights actions or procedures which, if not performed correctly, may indirectly affect operation or
may lead to an instrument response which is not planned
Caution!
Caution highlights actions or procedures which, if not performed correctly, may lead to personal injury or
incorrect functioning of the instrument
Warning!
A warning highlights actions or procedures which, if not performed correctly, will lead to personal injury, a
safety hazard or destruction of the instrument
Icon Meaning
Device certified for use in explosion hazardous area
If the device has this symbol embossed on its name plate it can be installed in an explosion hazardous area
in accordance with the specifications in the certificate or in a safe area
Explosion hazardous area
Symbol used in drawings to indicate explosion hazardous areas. Devices located in and wiring entering
areas with the designation “explosion hazardous areas” must conform with the stated type of protection
Safe area (non-explosion hazardous area)
Symbol used in drawings to indicate, if necessary, non-explosion hazardous areas. Devices located in safe
areas stiill require a certificate if their outputs run into explosion hazardous areas
Icon Meaning
Direct voltage
A terminal to which or from which a direct current or voltage may be applied or supplied
Alternating voltage
A terminal to which or from which an alternating (sine-wave) current or voltage may be applied or supplied
Grounded terminal
A grounded terminal, which as far as the operator is concerned, is already grounded by means of an earth
grounding system
Protective grounding (earth) terminal
A terminal which must be connected to earth ground prior to making any other connection to the
equipment
Equipotential connection (earth bonding)
A connection made to the plant grounding system which may be of type e.g. neutral star or equipotential
line according to national or company practice

WirelessHART Fieldgate SWG70 2 Identification
Endress+Hauser 7
2 Identification
2.1 Unpacking
2.1.1 Visual inspection
During unpacking:
• Check the packing materials for signs of transportation damage
• Remove the packaging material with care, so as not to damage the Fieldgate
• Store the original packing material, in case the Fieldgate must be shipped again
• Keep the documentation supplied with the Fieldgate in a safe place
In the event of damage to the Fieldgate, contact your Endress+Hauser Sales Center. Where possible,
return the fieldgate to us in its original packing.
2.1.2 Scope of delivery
Please check that the delivery is complete and free of defects before starting installation. The scope
of delivery comprises the following parts:
• WirelessHART Fieldgate SWG70
• Antenna
• Short instructions and CD-ROM
• Depending upon order, FieldCare Device Setup DVD
2.1.3 Storage und transport
Always store and transport the device in the original packaging.
Always store the device in a clean, dry environment. Note the permitted storage temperature,
see Chapter 13.4.

2 Identification WirelessHART Fieldgate SWG70
8Endress+Hauser
2.2 Device designation
The device designation together with other information is to be found on the nameplate affixed to
the front of the Fieldgate, see Fig. 2-1.
Fig. 2-1: Nameplate
The device type can be derived from the order code as follows:
2.3 Licensing agreement
The Product CD-ROM and FieldCare Device Setup DVD supplied with the WirelessHART fieldgate
contain a number of components that are required for its commissioning. These can be installed
free-of-charge on the computer to be used with the Fieldgate.
Information on the various Windows versions supported is to be found in the folder System
Requirements on the Product CD-ROM.
The full licensing agreement is also to be found on the CD-ROM. The software required for start-
up and commissioning, i.e. the Internet browser, is either freely available or is subject to the
licensing conditions of its manufacturer. Installation of this software on your computer implies that
you accept the terms of the corresponding licensing agreement.
1 Order number 3 Degree of protection, if any
2 Serial number 4 Telecommunication compliance)
123
4
WirelessHART Fieldgate SWG70
Approvals
AA
BG
Non-hazardous area
ATEX II 3G Ex nA II T4
Output
1
9
Ethernet + RS-485 + HART; OPC + Modbus
Special version
Service
IK
IW
Customized configuration
Without tooling DVD (FieldCare Setup)
Marking
Z1 Tagging (TAG)
52006327: Self-adhesive paper label
52006328: Supplied label/plate
SWG70- Product designation

WirelessHART Fieldgate SWG70 3 Function and System Design
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3 Function and System Design
3.1 WirelessHART protocol
The HART protocol has until now used the wired 4–20mA loop with a superimposed digital signal
as as physical layer. Although full digital communication is available in multidrop mode, the majority
of transmitters are connected to analog I/O cards and digital communication is used only for
parametrization, diagnosis and maintenance purposes.
WirelessHART now allows for the wireless transmission of HART data. To be employable
worldwide, WirelessHART utilizes the 2.4 GHz Band (IEEE 802.15.4 wireless network) as physical
layer. The WirelessHART devices form a mesh network in which every device is not just a
measurement point, but also a repeater. This results in a wider range for the whole network as well
as increased reliability through redundant communication paths.
The network may comprise three types of device:
• WirelessHART gateway (Fieldgate SWG70)
• WirelessHART field devices
• WirelessHART adapters (either connected to 4–20 mA/HART devices or acting as repeaters)
The WirelessHART network is built up, organized and maintained by the fieldgate, which also takes
care for connection to different HOST systems through different bus interfaces.
Fig. 3-1: WirelessHART network
Host applications
Ethernet
WirelessHART Fieldgate
Field devices with
Wireless Adapter SWA70

3 Function and System Design WirelessHART Fieldgate SWG70
10 Endress+Hauser
3.2 WirelessHART network
Fieldgate SWG70 is the master device in the WirelessHART network. Acting as network manager,
it recognizes other devices wanting to join the network. It makes contact with each in turn and
initiates the procedures required for them to join. The network organizes itself without any
intervention on the part of the user. Fieldgate SWG70 also acts as security manager and collects the
data sent by the network participants, converting it into a form which can be used by other systems
connected to it.
3.2.1 Network management
In its role as network manager, Fieldgate SWG70 organizes the wireless communication between
the WirelessHART field devices.
Fig. 3-2: Network management
After the Fieldgate has started up the network, devices can join. First, the device sends a join request
to announce its wish to join the network. If the WirelessHART field device can identify itself with
the same network ID and join key as stored in the WirelessHART gateway, the field device is
authorized to join the network. Otherwise, the field device will be rejected.
In the next step, the WirelessHART gateway sends session and network keys as well as scheduling
and routing information to the field device. The field device is told how to participate in the network
and receives various information from the WirelessHART gateway:
• Number and identity of neighboring WirelessHART field devices,
• When to send messages and which channels to use,
• When to repeat messages for other WirelessHART field devices,
• The optimal communication path for messages as well as alternative communication paths in
case of failure.
During this process, the field device may also apply to send messages in certain intervals and ask the
network manager for the appropriate resources. The network manager then takes care that these
resources are available. For example, the network manager informs other WirelessHART field
devices when to repeat messages.
3.2.2 Security management
Fieldgate SWG70 also acts as security manager. To make communication safe, all messages are
encrypted with industry-standard AES-128 block ciphers with symmetric keys. Therefore, messages
are unreadable for external listeners. The encryption keys are distributed by the security manager.
The Join Key is used to join the network. Subsequently, the Join Key is automatically exchanged
against the Session Key and the Network Key, i.e. two new additional keys.
1 Step 1: Advertising 4 WirelessHART gateway (Fieldgate SWG70)
2 Step 2: Join Request 5 WirelessHART device or adapter
3 Step 3: Authorization, Session & Network
Keys, Scheduling and Routing
1
2
3
45

WirelessHART Fieldgate SWG70 3 Function and System Design
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3.3 Connection to host applications
Fieldgate SWG70 also makes wireless communication accessible to HART-capable host systems via
its Ethernet or serial interfaces through the following functions.
3.3.1 Instrument List
WirelessHART devices in the network are made available to host systems via an instrument list. This
list contains one or more I/O cards. Every I/O card has one or more channels. Up to 15 field devices
can be connected in multi-drop mode to each channel, see Fig. 3-3. The list itself can be up and
downloaded, see Chapter 8.6.5.
Fieldgate SWG70 assigns a virtual I/O card to each WirelessHART device. The I/O cards are
assigned to the WirelessHART devices in the order in which they join the network. New
WirelessHART devices in the network are assigned to the next available I/O card, which is added
to the end of the instrument list (First-in-First-Out principle).
Within an I/O card, the WirelessHART device itself as well as status information is assigned to
Channel 0. If the WirelessHART device is an adapter, all field devices connected to it are assigned
to channel 1 (multi-drop mode). The list of the connected field devices is also called sub-device list.
Fig. 3-3: Instrument list
If a WirelessHART device loses communication to the gateway, it stays assigned to the I/O card
initially allocated to it. When communication is established again, the device thus has the same
position in the instrument list that it had before.
The same principle applies to the field devices connected to the WirelessHART adapter. When
communication to the gateway is lost, the long tags of the filed devices are stored. After
communication has been established again, the field devices regain their previous position in the
instrument list.
The gateway assigns WirelessHART devices on the basis of their long tag. If a defective device is
replaced, the new device can be configured with the same long tag. It will then be assigned to the
same I/O card in the instrument list as the device it replaced. A newly added WirelessHART device
that has an already existing long tag will not be included into the instrument list.
1
2
3
4
5
WirelessHART Gateway
I/O Card 1
I/O Card 2
Channel 0
WirelessHART Field Device
WirelessHART Adapter
Channel 0
Channel 1
HART Field Device 1
HART Field Device 2
HART Field Device 3
Network Structure I/O Structure Instrument List
1
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3 Function and System Design WirelessHART Fieldgate SWG70
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3.3.2 Caché
The WirelessHART gateway stores information received over the WirelessHART network and
makes it available to the host for further processing. This ensures that information is available
immediately for the host system without having to send a request to the device and wait for the
response. The following commands and answers to requests are cached in the gateway.
Information cachéd in the
WirelessHART gateway
Each listed command has its own cache memory. Static commands are stored in the cache upon the
first request. These contain device parameters, e.g. tags, that do not normally change. Dynamic
variables are stored each time a field device sends a burst message so that up-to-date values are
available at all times.
With the exception of commands the Write commands 17, 18, 22 and 51, when the WirelessHART
gateway receives a request from a host system which is embedded in Command 77, the response is
sent immediately (provided that the response is available in the caché).
Long Tag Emulation WirelessHART uses the long tag for addressing devices. Not every HART device supports long tags,
for example, older HART devices with HART Protocol Version 5 or less, do not support long tag
addressing (the current version is HART 7.0).
If a HART 5.0 device is connected to a WirelessHART adapter, the WirelessHART gateway emulates
the long tag using the "Message" field. When a host system addresses a HART 5 device, the
emulation translates Command 20(22) directly into Command 12 (17) which the HART 5
understands. The response is stored in the gateway cache for CMD 12(17) and for CMD 20(22).
Cache Command Description
Static: cachéd upon read 0, 11, 21 Read unique identifier (associated with tag or long tag)
Static: cachéd upon read
& write confirmation
12, (17) Read (Write) Message
13, (18) Read (Write) Short Tag, Descriptor, Date
20, (22) Read (Write) Long Tag
50 (51) Read (Write) Dynamic Variable Assignments
Dynamic: cachéd on
publication only
1 Read Primary Variable
2 Read Current and Percentage
3 Read All Variables
9 Read Device Variables and Status
33 Read Device Variables
93 Read Trend
48 Read Additional Device Status
38 Reset Configuration Change Counter

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4 Mechanical Installation
!Note!
• It is recommended that Fieldgate SWG70, adapters and devices be setup on the test bench and
the network be tested before the components are installed in the field.
4.1 Mounting considerations
4.1.1 Positioning the Fieldgate
Install the gateway first, before installing other WirelessHART devices. This way you can check for
proper operation of new devices as they are installed. Nevertheless, consider the location of future
WirelessHART devices that will be routed through the gateway to ensure good connectivity.
Guidelines for Planning a WirelessHART Network
• Mark the positions of the various measuring points on a scale overview of the plant. It is
important that the overview shows likely obstacles to the propagation of the radio waves
• Make sure that a minimum of 2 other WirelessHART devices are well within the antenna range
of the device. If necessary, consider using an adapter as a additional stand-alone repeater. For
more information on the antenna characteristics please refer to the following section
• Where a lot of metal, grids or walls prevent a device from being in line-of-sight of its nearest
neighbour, the maximum distance between two devices is 30 m. Install wireless devices at
least 1m above the ground or the floor.
• Where there are fewer structural elements and one or more neighbours are in-direct-ine of
sight, the maximum distance between two devices for planning purposes is 200 m. In this case,
install wireless devices at least 3m above the ground or the floor.
• Consider moving objects that could affect the device's antenna range
• Make sure that the device's antenna is aligned vertically
• If possible, position the Fieldgate at or near the centre of the network - it should be in contact
with at least 20% of the devices in the network.
• Do not position WirelessHART devices directly below or above each other as they will be
outside each other's antenna range, see Chapter 4.1.5
• If possible, do not position the device next to metal surfaces, pipes or walls containing metal
(minimum distance: 6 centimeters). There should be as little metal around the device as
possible
• Do not position other 2.4 GHz devices like cordless phone bases or WLAN routers near
WirelessHART devices. Wireless technologies used in an industrial environment must be able
to coexist without disrupting each other. If multiple networks operate in one facility, wireless
frequency management may be required.
4.1.2 Positioning and connecting a remote antenna
An antenna is supplied with the device. If the application requires that the Fieldgate be mounted in
a protective enclosure, connect a remote antenna to the antenna terminal and mount the remote
antenna outdoors (information on request). The maximum antenna cable length depends upon the
damping properties of the cable. For cables with low damping, the antenna cable should not be
longer than 25 m. The guidelines for positioning a WirelessHART device also apply to the
positioning of a remote antenna (see Chapter 4.1.4).
Connecting the antenna 1 Firmly screw the antenna or a remote antenna to the device's antenna terminal
(see Item 6 in Fig. 5.1 in Chapter 5.1).

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4.1.3 Antenna characteristics
Fig. 4.1 shows the antenna gain in the vertical and horizontal planes.
Fig. 4-1: Antenna gain in the vertical (above) and horizontal planes

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4.1.4 Antenna range
Fig. 4.2 is a schematic representation of Fig. 4.1 and shows the wave propagation with the signal
attenuation. The antenna is an omni-directional dipole antenna. If you point the antenna upwards,
the signal radiates horizontally at an angle of approx. 39 degrees above and below the horizontal
(donut shaped). The most power is in the horizontal plane, decreasing to 50% at an angle of 39°C.
Almost no signal will be radiated directly above and below the antenna. Consider this when
planning a WirelessHART network.
The height differences between wireless devices in a network should not be too big.
The schematic is valid only for an antenna placed outdoors with no metal surfaces near. The
radiation pattern changes significantly when metal surfaces are close to the antenna.
Fig. 4-2: Wave propagation, schematic representation (alpha = approx. 39°)
1: No signal above and below 2: Stronger signal sideways
1
22
1
α
α
α
α
100% 100%
50%50%
50%50%
0%
0%

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4.1.5 Examples for good and poor positioning
The positioning is good when the network participants are within the antenna range:
Fig. 4-3: Example of good positioning
The positioning is poor when neighbours are not in the antenna range or within the weaker signal
zone of the antenna:
Fig. 4-4: Example of poor positioning
PWR
COM
FLT
☺
height
distance
PWR
COM
FLT

height
distance

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4.2 Mounting the Fieldgate
In addition to fulfilling the conditions for good wireless communication, the mounting location
should be well accessible for mounting and electrical installation. Make sure that there is enough
space to open the housing cover and to access the terminals, switches, and cable glands. Choose a
mounting location that meets the climatic limits specified and radio requirements in the technical
data.
The housing has a degree of protection of IP65 and is designed for wall mounting (mounting
accessories not included).
Required tools:
• 2 screws (M6)
• Drill
• Screwdriver
Fig. 4-5: Mounting holes and housing screws
Mounting the Gateway 1 Drill 2 holes in the mounting surface so that they match the holes of the housing
(centres 240 mm to 250 mm apart).
2 Screw the device to the mounting surface.
1 Mounting holes 2 Housing screws
2
1 1
2

5 Electrical Installation WirelessHART Fieldgate SWG70
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5 Electrical Installation
5.1 Connections and interfaces
The connections and interfaces are only accessible with an open enclosure. In the case of the DIP
switches, the user has the choice of using the switch settings, or overriding the settings by software,
see Chapter 8.
#Warning!
• When Fieldgate SWG70 is installed in Zone 2, the connection/disconnection of cables is
permitted only in the absence of any potentially explosive atmosphere or when the fieldgate is not
connected to the power supply.
Fig. 5-1: Connections and interfaces
1 Grounding terminal 5 Antenna
2 RS-485 interfaces, duplicated terminal
block for daisy-chain capability
6 Antenna terminal
3 Ethernet interface 7 Cable glands
4 Power supply connections (redundant)
5
1
6
1
2 3 4
7