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SmartSwarm 351
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CONEL SmartSwarm 351 Технические характеристики онлайн

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Modbus Eavesdrop to MQTT IIoT Gateway

SmartSwarm 351

Introduction

Seamlessly connect existing Modbus process systems into the Industrial Internet of Things

While a number of “Modbus to MQTT” gateways exist, most expect to act as the local

Modbus master device, recovering information from a network of connected slaves. This

presents a problem for operators of existing process control systems. A Modbus network

can only have a single master device. To use these gateways, any existing master system

has to be disconnected. That is impractical if it is running the user’s critical process.

The SmartSwarm 351 overcomes this limitation by transparently “eavesdropping”

on communications between the existing master device and the connected slaves. It

non-disruptively derives the I/O status of connected devices and uses this information to

provide a real time data feed to a connected IIoT architecture.

Providing a real time data feed is only part of the story. Because of its origins, Modbus is

a highly optimized protocol that returns data as a simple series of register values, leaving

the master device to interpret the returned data. Any new applications that need to use

this data must have intimate knowledge of the devices producing it. This is not a good

situation for IIoT systems, where data should be semantically searchable and self-deﬁning.

For this reason, the SmartSwarm 351 offers powerful data enrichment and event triggering

functionality to transform the base Modbus data into contextualized, ﬁltered information

right at the network edge. This enables direct consumption of the data by upstream

IIoT applications, which need not have any prior knowledge of the details of the devices

producing the information.

DATA ENRICHMENT

One of the key advantages of an IIoT architecture is that it allows applications to ﬁnd

information that is relevant to them, with no need for detailed knowledge of where or

how the information was produced. Data enrichment is the process by which obscure,

device-speciﬁc data such as that produced by a Modbus slave is transformed into topic-

based, self-declaring data. SmartSwarm 351 uses a combination of MQTT topics and

JSON payload formats to ensure that the information it publishes can be readily consumed

by upstream applications. Default topic deﬁnitions and payload formats mean that -- even

without conﬁguration -- the SmartSwarm 351 can publish data it discovers about the

Modbus network. Crucially, it allows users to conﬁgure both the topic alias and payload

transformation in order to provide much more descriptive and semantically rich content.

• Transparently connects to existing serial Modbus RTU networks

• Provides parallel data feed into Enterprise IIoT systems while the existing

Modbus network continues to operate

• User conﬁgurable data enrichment and event triggers

• Extensive conﬁguration options for interpretation of Modbus data

• Cellular or Ethernet connection to IIoT system

• Also acts as LAN to WAN bridge for 3rd party device connection

PRODUCT FEATURES

SmartSwarm 351_R1_2716ds

DATA FILTERING

Much of the data that the gateway will see in the Modbus network is of little value. If a

temperature reading rarely changes, for example, there is no point in reporting it every

time it is sampled. For this reason, in addition to enriching the data, SmartSwarm 351 also

allows users to conﬁgure the triggers that will cause a monitored value to be published.

The triggers could include, for example, a temperature reading that has exceeded a

threshold, has an excessive rate of change, or has moved by more than a conﬁgurable

amount since the last time it was published. This means that the information published

by the gateway is always signiﬁcant and of value. At the same time, the gateway is

decreasing the communications overhead and the enterprise processing bandwidth

needed to handle it. Users can also conﬁgure what is published once an event trigger

condition is met – this might be just the changed value, a range of data, or all data from

the same register type within the RTU. This lets users optimize the trafﬁc across the

communications network.

CONNECTIVITY AND SECURITY

SmartSwarm 351 connects to enterprise applications via either a local Ethernet

connection, or wirelessly via an internal cellular modem. The gateway can switch between

these connections at any time, providing redundancy. All inbound WAN connections are

prohibited by an Internal ﬁrewall. In addition, the gateway provides a second Ethernet port

for a local LAN connection, and bridges trafﬁc from this LAN to its active WAN connection.

The gateway may be used as a cellular modem to allow any local Ethernet-enabled device

to obtain an outbound WAN connection. OpenVPN tunneling is also supported. Outbound

connections to the SmartWorx Hub remote conﬁguration tool and the remote MQTT broker

are authenticated and encrypted using TLS, with certiﬁcate authentication of the host and

certiﬁcate provision by the gateway.

CONFIGURATION

Conﬁguration is achieved via the SmartWorx Hub remote conﬁguration management tool.

This provides access to all of the conﬁgurable parameters, and also supports zero touch

provisioning, where a unit’s conﬁguration can be entered prior to it arriving at site, and

automatically downloaded once it is switched on. In addition to system conﬁguration,

SmartWorx Hub also supports remote upgrade of applications and ﬁrmware, on an

individual device and/or group basis. Where a large number of Modbus slave points need

to be deﬁned, this information can be assembled ofﬂine and presented as a .CSV or Excel

ﬁle and imported into SmartWorx Hub for subsequent download to a unit or group of units.

CONEL SmartSwarm 351 Технические характеристики онлайн

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