GE 90-30 PLC, Руководство пользователя

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GFK-1322A 1-1
Overview
The Series 90 PLC L
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Bus Interface Module (LBIM) provides an interface between the
GE Series 90-30 PLC (programmable logic controller) and an Echelon L
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network. The LBIM maps network variables into specific PLC register locations. It can support up
to 244 network variables (240 can be configured by the user), and map these network variables
into the %I, %Q, %AI, and %AQ PLC memory references. The Module adheres to the L
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Layers 1—6 Interoperability Guidelines (078-0120-01)for the interface to the L
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network
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network can range in size from two to tens of thousands of devices and can be used
in a wide range of control network applications. L
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technology uses peer-to-peer
architecture, in which intelligent control devices, called nodes, communicate with each other
using the L
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protocol. Each node consists of a physical interface that couples the node
microcontroller with the communications medium, and embedded intelligence that implements
the protocol and performs control functions. Figure 1-1 illustrates a sample network configuration
that uses an LBIM to communicate with a Series 90-30 PLC.
An individual node usually performs a simple task. Devices such as proximity sensors, switches,
relays, and motor drives can be nodes on a network. The network controls the interaction of the
nodes to perform a complex application, such as controlling a manufacturing line or automating a
building.
The LBIM can interface with networks that use twisted pair cabling . The LBIM contains a
transceiver that provides a physical communication interface between the module and a
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network. The type of embedded transceiver determines the network topology
supported.
Table 1-1. Bus Interface Module Products
Catalog No. Embedded Transceiver Topologies Supported
PE693BEM350
TP/FT-10 Free
(Bus, Star, Loop, Others,
Combinations)
PE693BEM351 TP/XF-78 Bus/Loop
PE693BEM352
TP/XF-1250 Bus/Loop
The following topics are presented in this chapter:
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Network Overview...................................................................................1-2
„ Bus Interface Module Overview..................................................................................1-5
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Chapter