Schneider Automation Modicon Quantum Ethernet Betriebsanweisung Seite 23
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Introduction
840 USE 115 00 Version 1.0
13
Ethernet network traffic, messa
g
e len
g
th and routin
g
are all variable and can be
unpredictable. This can
g
ive rise to con
g
estion and messa
g
e collisions. When
collisions occur, Ethernet uses a variable dela
y
before retransmittin
g
messa
g
es.
Therefore, absolute determinism -- or totall
y
predictable performance -- cannot be
g
uaranteed on bus
y
Ethernet networks.
1.4.2 Compatibility
Ethernet technolo
gy
allows devices from different vendors to coexist on the same
network. These devices include hubs, brid
g
es, routers and
g
atewa
y
s. However, for
these devices to be compatible the
y
must support the same set of protocols.
Quantum Ethernet modules support Modbus protocol over TCP/IP over Ethernet
protocol. S
y
stems that wish to communicate with Quantum Ethernet web
embedded server modules need to support this protocol stack.
Ethernet
Developers Kit
The Modbus protocol was chosen for its particular suitabilit
y
for the real time
control environment. It is a well-known and widel
y
-adopted protocol and is full
y
described in the Ethernet Developers Kit. This kit
(
140 EDK 211 00
)
helps users
develop Ethernet-based communications to their own host
(
PC-based
)
sockets
applications. It contains a Quantum Ethernet module plus documentation and
software tools which full
y
explain the protocols. The Ethernet Developers Kit is
available from
y
our distributor or local S
q
uare D office.
Ethernet and
Quantum Hot
Standby
Systems
Ethernet web embedded server modules ma
y
be installed in a hot standb
y
s
y
stem,
but the
y
are not supported at switchover. When control shifts from the primar
y
controller to the standb
y
, the Ethernet network is not notified. The network
continues to address the Ethernet web embedded server module in the ori
g
inal
primar
y
rack, not the module in the new primar
y
rack.
EMBP Gateway
A Quantum Ethernet web embedded server module can exist on the same Ethernet
network as the EMBP Gatewa
y
, but it cannot communicate with the EMBP
Gatewa
y
because of differences in formattin
g
and network addressin
g
. However,
the MBT Ethernet Brid
g
e can be used with the web embedded server module
(
refer
to
Modbus Plus to Ethernet Bridge Users Guide,
890 USE 151 00
)
.
1.4.3 Guidelines for Designing Your Network
A t
y
pical Ethernet installation carries man
y
different t
y
pes of traffic. Lar
g
e data file
transfers or World Wide Web
g
raphics files can keep the network bus
y
and cause
network con
g
estion and collisions. These collisions cause nodes to wait a variable
amount of time before resendin
g
their messa
g
es. Because the size and fre
q
uenc
y
of non-control traffic is unpredictable, network performance ma
y
not be suitable for
control applications. These problems can be
g
reatl
y
reduced b
y
se
g
re
g
atin
g
the
office and MIS traffic from control data.
- Modicon Quantum Ethernet 1
- Web Embedded Server 1
- Module User Guide 1
- Web Embedded Server Module 3
- User Guide 3
- Document Set 4
- Contents 10
- About This Book 11
- Document Scope 11
- Related Documentation 12
- Validity Note 12
- Introduction 13
- Twisted Pair 140 NOE 211 10 14
- Fiber Optic 140 NOE 251 10 14
- 1.2 Front Panel Components 15
- 840 USE 115 00 Version 1.0 16
- NOE 251 10 16
- NOE 211 10 17
- 1.2.2 Address Labels 18
- 8 4 . 1 1 . 1 1 4 . 1 6 8 19
- 1.2.3 Twisted Pair Connector 20
- 1.2.4 Fiber Optic Connectors 20
- 1.3 Utility Diskette 21
- 1.4.2 Compatibility 23
- 2.1 Before You Begin . . 25
- 2.1.2 Verifyin 26
- 2.2 Installing the Module 27
- 2.2.3 Connecting the Cable 28
- 2.4.2 Assigning a Slot Number 31
- 2.4.5 Resetting the Module 32
- The MSTR Instruction 35
- 3.1 Introduction 35
- 3.2 MSTR Description 35
- 3.2.1 Characteristics 36
- 3.2.2 Representation 37
- data area 44
- control block 44
- information: 50
- Wide Web 51
- 4.1 Introduction 51
- Retrievin 52
- Data via the World Wide Web 52
- Premium PLCs 53
- Using the Network Options 55
- Ethernet Tester 55
- 5.1 Introduction 55
- Figure 21 Get Statistics Box 58
- Figure 22 Sample Statistics 59
- Figure 23 Read Register Box 61
- Ladder Logic Block 62
- Library User Guide 62
- Maintenance 63
- 6.1 Responding to Errors 63
- 6.1.2 Active LED 64
- 6.1.3 Ready LED 64
- Specifications 73
- Ethernet Developers Guide 75
- B.1 Introduction 75
- B.2 References 75
- B.3 Overview 76
- B.4 Development Environment 76
- B.5 Class Descriptions 77
- B.6 The CSample_doc Class 78
- B.7 The CSample_View Class 79
- B.8 Timers 81
- B.9 Transaction Processing 81
- B.10 Transmit State Machine 82
- B.11 Receive State Machine 84
- Quantum Ethernet TCP/IP 87
- Modbus Application Protocol 87
- C.1 Introduction 87
- C.3 TCP/IP Specific Issues 92
- C.4 Reference Documents 93
- Suppliers 95
- Glossary 100
- 840 USE 115 00 Version 1.0 103
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