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DSS NETWORKS Gig-cPCI-3U Manual de usuario Pagina 57

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product selection guide · summer 2007 |
i / o & c o m m u ni c a t i o n s
In theory, Ethernet is a great technology for
real-time control networks. It is familiar, it is
ubiquitous and it is cheap. But Ethernet has
a serious drawback: there is no way to know
exactly when a message will be delivered.
Real-time networks have always been based
on the certainty that when instructions are
sent, they will be received and understood in
about one millisecond.
The reason for Ethernet’s unpredictability is
the CSMA/CD bus access procedure (Carrier
Sense Multiple Access with Collision Detec-
tion). CSMA/CD is a temperamental mailman
who delivers mail unpredictably, and in the
real-time world of machine control, this kind
of chaos is simply unacceptable. So unless a
true, dedicated connection can be introduced,
Ethernet has no role in real-time networking.
Switches offer real-time operation
Fortunately, there is an innovative way to
overcome this inherent limitation of Ethernet.
It is based on the use of Ethernet switches and
full duplex connections. An Ethernet switch
decides which pathway a data packet takes
from among the many possible paths through
the network, and therefore offers the potential
for control. The secret to real-time Ethernet is
to define an individual ‘network’ for every indi-
vidual piece of terminal equipment, on which
only that terminal equipment communicates.
By using two cable pairs for each connec-
tion, data packets can be sent and received
simultaneously (full duplex operation). In this
configuration, using full duplex and switching,
two pieces of terminal equipment cannot
get in the way of one another, and collisions
involving two or more data transmissions are
impossible (see Figure). The chaotic CSMA/CD
bus access procedure is no longer a factor,
and Ethernet offers a real-time capability,
which makes it suitable for industrial and
defense applications.
For a complete description of this type of
Ethernet network configuration, please
download our white paper which is available
at www.gefanucembedded.com
Form Factor Inputs Outputs Bidirectional Temp (C) Cooling
DIO1-6CP
cPCI 6U 16 HLD; 16 TTL Level Discrete; 16 HLD Loopback; 16 Differential Logic 16 Differential Logic; 16 Discrete Ground/Open; 16 TTL Level Discrete;
1 Analog Interface; 8-Channel 10-Bit ADC for
monitoring the power supply secondary voltages
-40º to +85º Conduction Cooled
DIO1-cPCI-CC
cPCI 3U 8 Bi-Level Optically Coupled 8 Bi-Level Optically Coupled
16 Individually Programmable General Purpose
TTL I/O
-40º to +85º Conduction Cooled
DIO1-VME-CC
VME 120 A/D 104 General Purpose; 8 Software Programmable; 8 High Current None -40º to +85º Conduction Cooled
DIO2-cPCI-CC
cPCI 3U 8 TTL Bi-Level Discrete
16 Discrete 300 mA 28 V; 16 Discrete Open Collector Outputs; 32 Discrete Source 28 V; 8 TTL
Bi-Level Discrete; 1 Four Coil Stepper Motor
1 Analog Interface; 8-Channel 10-Bit ADC for
monitoring the power supply secondary voltages
-40º to +85º Conduction Cooled
DIO2-VME-CC
VME 2 50-kHz Serial Differential Inputs; 20 High-Level 16-Bit Differential Analog 2 50-kHz Serial Differential; 20 High-Level 16-Bit Differential Analog None -40º to +85º Conduction Cooled
DIO3-cPCI-CC
cPCI 3U
32 0 to 28 Volt Discrete; 4 Analog Frequency; 11 High-Level Single Ended Analog; 28 Low-Level Differential Analog;
2 Frequency Gear Sensor
6 DC Programmable Analog -10 to +10V; 4 Excitation +/-10 Volt
1 Analog Interface - 8-Channel 10-Bit ADC for
monitoring the power supply secondary voltages
-40º to +85º Conduction Cooled
DIO3-VME-CC
VME 32 Analog-to-Digital Converter (ADC) 32 General Purpose Outputs; 1 Tone Generator None -40º to +85º Conduction Cooled
DIO4-cPCI-CC
cPCI 3U 24 Discrete Ground/Open 0 to 28 V; 16 TTL Level Discrete; 16 HLD Loopback 16 TTL Level Discrete; 16 Discrete Ground/Open
1 Analog Interface; 8-Channel 10-Bit ADC for
monitoring the power supply secondary voltages
-40º to +85º Conduction Cooled
Real Time Ethernet Networks
WAFER E TCH TOOL 1
IP SUBN ET: 192.168.10.1
WAFER ST ORAGE
IP SUBN ET: 192.168.100.1
STORAGE
UNIT 3
STORAGE
UNIT 2
STORAGE
UNIT 1
ETHERNET
SWITCH
LAYER-2
EXECUTIVE OFFICES
IP SUBN ET: 192.168.2.1
CTOCOOCEO
ETHERNET
SWITCH
LAYER-2
WAFER ST ORAGE
IP SUBN ET: 192.168.100.1
WORK
STATION 1
WORK
STATION 2
WORK
STATION 3
ETHERNET
SWITCH
LAYER-2
ETHERNET SWI TCH
LAYER-2
TRANSP ORT
MODULE
ETCH CHAMBER 3
(E TCH)
ETCH CHAMBER 1
(E TCH)
ETCH CHAMBER 2
(E TCH)
ETCH CHAMBER 4
(E TCH)
ETHERNET SWI TCH
LAYER-2
WAFER E TCH TOOL 2
IP SUBN ET: 192.168.90.1
ETHERNET SWI TCH
LAYER-2
WAFER E TCH TOOL 9
IP SUBN ET: 192.168.90.1
ETHERNET SWI TCH
LAYER-2, LAYER-3
(ROUTER)
ETHERNET SWIT CH
LAYER-2, LAYER-3
(ROUTER)
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