Crestron DV-320-K Bedienungsanleitung PDF herunterladen (Seite 35)

The use of Ethernet cabling right down to

ﬁ eld level provides a transparent network for

commissioning and maintenance, and

depending on requirements, the relevant

IP-based protocol can be used for

communication on this network.

BACnet/IP

The international BACnet standard, which

ensures the interoperability of building

automation and control devices from

different manufacturers, is growing in

popularity and is being constantly enhanced

with new functions. BACnet/IP can be used

on all PC-based Beckhoff hardware platforms

– down to the ﬁ eld level – as a universal

Ethernet protocol. The rail-mountable

Embedded PC models CX8091, CX9020,

CX5010 and CX5020 are certiﬁ ed for the

ISO 16484-5:2010 Rev. 12 BACnet standard

and feature a powerful control platform

ranging from the CX8091 with support for

250 data points to the CX5020 which can

collect and process several thousand BACnet

objects.

And since the BACnet protocol is

integrated into the TwinCAT System Manager,

the I/O Bus Terminals and BACnet devices

are easily conﬁ gured via the tool-based

automapping function. BACnet servers

and clients can be installed in a structured

manner so that the BACnet properties can

be easily linked to the PLC as parameters

and process data. In addition, the ability

to access BACnet data via a non-cyclical

interface makes it easy to implement

visualisation components. Another feature is

the dynamic generation of BACnet objects,

which makes it possible to subsequently

generate and conﬁ gure schedules and

trend objects. Distributed clocks can be

synchronised with the supported client

and master functions, and even automatic

summer and winter time adjustments can be

implemented with the integrated operating

system functionality. Since hardware status

monitoring has been integrated into the

BACnet/IP implementation, it is available to

all BACnet/IP applications without additional

effort, too. The advanced alarm and event

services, additional object types, improved

device management features and increased

execution performance of BACnet Rev. 12 are

also implemented in TwinCAT BACnet/IP and

add to the user beneﬁ ts.

Since the Beckhoff solution was

developed completely in-house, users can

be conﬁ dent that the company has plenty of

expertise in the ﬁ eld.

OPC Uniﬁ ed Architecture (UA)

OPC UA is gaining acceptance on all levels of

the automation pyramid. Its scalability ranges

from small 15-kB footprint applications in

tiny embedded sensors to communication

with ERP level and SAP systems right up

into the cloud. OPC UA has its origin in

automation technology, but its industry-

neutral nature makes it increasingly popular

as a consistent communication platform in

building automation and smart metering

applications.

Since OPC UA can be used as both

server and client, the traditional “top-down”

direction of the communication ﬂ ow becomes

increasingly immaterial. While “OPC classic”

was based exclusively on Microsoft’s COM/

DCOM technology, OPC US is independent

from the operating system and language as

well as scalable from the sensor to the ERP/

cloud level. Security-by-design provides user

authentication, message signing and data

encryption already in the OPC UA stack. And

its modelling of information sources makes

OPC UA particularly interesting for other

organizations, who can organize their existing

objects in the UA name space and deﬁ ne

“What is being communicated” while OPC UA

manages transport security and access rights

by asking “How is it being communicated?”.

OPC UA is currently the only IEC standard-

based SOA technology that features semantic

interoperability. Besides PLCopen, the BACnet

group also maintains a joint group with the

OPC Foundation in order to provide BACnet

objects in the OPC UA name space and create

an easy link to administrative/ERP processes

via OPC UA.

The use of standardised protocols such as BACnet/IP and OPC UA ensures

investment protection through vendor-independence.

Open communication

New Automation Technology

BECKHOFF

We reserve the right to make technical changes.

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