Siemens 7 Bedienungsanleitung Seite 58

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58 Publication LOGIX-AP008B-EN-P - June 2008
Chapter 2 Logix Features that May Not be Familiar to S7 Users
Backing Tags
Many instructions and data types use backing tags – tags that are created
specifically for the instance of the instruction or data types that you are
instantiating. Add-On Instructions, timers, counters, messages, and PID
control all use backing tags. RSLogix
5000 software will generate the
corresponding structure of elements for you anytime you create a tag of that
type so you do not have to create the elements on your own.
The Common Industrial
Protocol (CIP)
Logix uses three main networks - Ethernet/IP, ControlNet and DeviceNet.
Each has characteristics suitable for different areas of application. The three
network types share a protocol, the ‘Common Industrial Protocol’.
The CIP makes it possible to transfer data via any of the three types of
networks supported by Logix with a nearly identical configuration and
programming interface for all three. Also, data can be transferred through a
network built from more than one of the three network types without any
need for the programmer to translate protocols.
In “traditional” S7 the two main protocols are Industrial Ethernet, for
networking to IT and to other controllers, and Profibus DP for networking to
field systems. These two protocols are separate at the hardware level and the
data level. With the latest S7 hardware and software, “Profinet CBA” integrates
Industrial Ethernet, Profinet and Profibus.
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