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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. To this end, it first sends out a call
for devices to join the network. Then, 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 neighbouring 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 WirelessHART device or adapter 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
4
5
- WirelessHART Fieldgate SWG70 1
- Table of Contents 3
- Revision History 5
- Registered Trademarks 5
- 1.1 Designated use 6
- 1.3 Operational safety 6
- 1.7 Conventions and icons 8
- 2 Identification 9
- 2.2 Device designation 10
- 2.3 Licensing agreement 10
- 3 Function and System Design 11
- 3.2 WirelessHART network 12
- 3.3.1 Instrument List 13
- 3.3.2 Cache 14
- 4 Mechanical Installation 15
- 4.1.3 Antenna characteristics 16
- 4.1.4 Antenna range 17
- 16 Endress+Hauser 18
- ≤ 20 dBi 19
- 4.3 Mounting the Fieldgate 21
- 5 Electrical Installation 22
- +24V +24V0V 0V 23
- 5.3 Connecting to Ethernet 24
- 5.4 Connecting to RS-485 25
- Plastic 2.5 Nm 26
- Nickel-plated brass 4.1 Nm 26
- Stainless steel 4.1 Nm 26
- 6Operation 27
- 6.1.1 LEDs 28
- 6.1.2 Buttons 29
- 6.1.3 DIP switches 30
- 7 Commissioning 31
- 7.2 Ethernet connection 32
- 7.2.2 Check the connection 33
- 7.3 RS-485 connection 34
- 7.4 Installing FieldCare 35
- 7.5.1 Add the HART IP CommDTM 37
- 7.5.2 Add the Fieldgate SWG70 38
- 7.6 User interface 42
- 8 Fieldgate Configuration 43
- 8.2 Wireless Communication 44
- 8.2.2 Advanced Setup 46
- 8.2.3 Operating Modes 47
- 8.3 Wired Communication 48
- 8.3.2 Ethernet 49
- 8.3.3 HART 50
- 8.3.4 Modbus 51
- 8.3.5 AMS 52
- 9 Diagnostics 53
- 9.2 Wireless Communication 54
- 9.2.2 Details 55
- 9.2.3 Burst Lists 56
- 56 Endress+Hauser 58
- Topology parameters 58
- 9.3 Wired Communication 59
- 9.3.2 HART 60
- Endress+Hauser 59 61
- HART parameters 61
- 10 Engineering 62
- 10.2 Modbus Mapping 65
- 10.2.2 Input Status 66
- Endress+Hauser 65 67
- Input Status parameters 67
- value in the Register field 69
- 10.2.3 Input Register 70
- Endress+Hauser 69 71
- Input Register parameters 71
- 11 Additional Functions 77
- 11.3 About 78
- 11.6 Set DTM Addresses (DTM) 79
- 12 Measurement 82
- 13 Maintenance and Repair 83
- 14 Trouble-Shooting 84
- 14.1.3 Expand the Network 85
- 14.2 Diagnosis 86
- Endress+Hauser 85 87
- 15 Technical Data 88
- 15.3 Power Supply 89
- 15.4 Environment 89
- 15.5 Mechanical Construction 90
- 15.6 Operability 91
- A Appendix: Modbus Interface 92
- A.1.2 Modbus in Fieldgate 93
- A.1.3 Data types 95
- A.2 Rules for mapping 96
- A.3 Mapping formats 98
- A.3.4 Read Discrete Inputs 100
- B Appendix: CSV File Formats 101
- B.3 Instrument List CSV files 102
- B.4 Topology View CSV file 102
- B.5 Details 103
- C.1 HART OPC server 104
- Endress+Hauser 105 107
- C.3.1 Fieldgate properties 108
- C.3.2 Adapter properties 109
- C.3.3 Device properties 110
- C.3.4 Device data 115
- C.4 OPC client 116
- Endress+Hauser 115 117
- D Appendix: ANATEL Approval 118
- Endress+Hauser 117 119
- For your notes 119
- 118 Endress+Hauser 120
- Endress+Hauser 119 121
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