Datalogic DS8100A, Справочное руководство

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TYPICAL LAYOUTS
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7 TYPICAL LAYOUTS
DS8100A scanners are mainly designed to work together on a high performance Lonworks
sub-network to create multi-sided and omnidirectional reading stations that can interface with
Serial or Fieldbus Host networks. This chapter covers the most common Lonworks layouts.
DS8100A scanners can however, be connected in a variety of layouts depending on the
number of scanners used and the required complexity of the reading station. Layouts range
from single Stand Alone to complex alternative networks when Lonworks is not available for
all readers (mixed reader networks). For alternative layouts see appendix A.
Several power supplies are available to power the reading stations.
Photoelectric sensors used as code presence sensors and optical encoders to signal
conveyor speed are also available accessories.
The following typical layouts refer to the system hardware configurations, but they also
require the correct setup of the software configuration parameters (see par. 8.2 for details).
The accessories and cables indicated in the following figures are Datalogic products. We
suggest their use to guarantee the correct system functioning.
7.1 LOCAL LONWORKS NETWORK
A local Lonworks network allows logically connecting a DS8100A master reader with up to 31
DS8100A slaves. Actually, the maximum number of readers to be employed in the network
depends on the system operating conditions, that is adopted operating mode and amount of
data stream.
When creating your network, always keep in mind the following guidelines:
the Lonworks network logically supports a maximum number of 32 devices (master +
slaves);
it is recommended to adhere to the 8-in-16 rule (not more than 8 devices in any 16 meter
bus segment (branch);
for DS8100A scanners the total bus length may extend up to 65 m (213 ft);
the maximum number of DS8100A readers supported also depends on the type of power
propagation adopted by the system (see the specific power supply installation manual for
details).
Typically the layouts can be divided into Synchronized (single P.S.) or Multidata (multi P.S.)
networks. They can be small (up to 10 scanners) or large (more than 10 scanners).
Contact Datalogic Automation S.r.l., if your network requires a higher number of readers or in
case the application throughput is very high.
For further information on Lonworks network cabling and connections see the “LonWorks®
TPT Twisted Pair Transceiver
Module User’s Guide”, available from the website:
www.echelon.com.