Vega WHA-GW-WIRELESSHART GATEWAY Bedienungsanleitung PDF herunterladen (Seite 83)

WHA-GW-*

Operation

221981 2011-07

If there are problems with other wireless technologies disrupting the WirelessHART

network, you should configure the Gateway to skip certain channels known to provide

persistent interference (Blacklisting). Blacklisting is a user configurable feature and is

useful when other wireless networks are in the physical environment of the WirelessHART

network (see chapter 5.4.1).

If possible, also actively manage frequencies used by other networks. If possible block the

usage of certain channels already used by the WirelessHART network (frequency

management).

6.5 Modbus Mapping

6.5.1 Overview

The Modbus implementation maps HART dynamic input variables over Modbus input

registers and also uses input registers to provide device-related status information. The

Modbus implementation is based on the following assumptions:

• The HART CMD 3 dynamic variables are used for Modbus mapping.

• For Modbus access, CMD 3 publishing must be enabled for all relevant devices.

• The Gateway caches the relevant CMD 3 information. Modbus commands will therefore

access the internal Gateway memory.

• Modbus input registers are only supported if they are associated with HART dynamic

input variables.

• A device can either be a WirelessHART device or a wired HART device connected to a

WirelessHART adapter.

• WirelessHART and wired HART devices are mapped independently within the Modbus

input registers. Wired devices are not necessarily mapped consecutive with the

associated WirelessHART adapter.

Standard compliance Modbus RTU Modbus TCP

Physical layer RS-485 Ethernet

Transmission mode RTU (binary mode) –

Baud-rates 1200 bps, 2400 bps, 4800 bps,

9600 bps, 19200 bps,

38400 bps, 57600 bps,

115200 bps

–

Parity Odd, Even, None –

Stop bits 1; 1.5; 2 –

Polling address 1...247 –

Capabilities • Input registers starting at Modbus address 30001

• HART CMD 3 dynamic variables mapped into input registers

• 2 input registers map a single HART dynamic variable

• 32bit HART floating point format used

• Status information mapped on dedicated input registers

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 95 96

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