Siemens IP-Module Especificaciones Pagina 18

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H1 protocol CP143 H1 / TCP/IP manual
2-2 Rev. 00/07
2.1.2 Operation
The Industrial Ethernet H1 LAN (in conformance with the Ethernet system standard) employs a
random access technique: every terminal device accesses the bus when required. Access to the bus
is co-ordinated by a CSMA/CD (Carrier Sense Multiple Access/Collision Detection) mechanism:
every terminal device listens on the LAN and accepts transmissions that match its own address.
Terminal devices can start a transmission only if the bus line is not engaged. Should two terminal
devices initiate a transmission simultaneously, they detect this event and stop transmitting. After a
random delay time they will restart the aborted transmission.
The programmers PG 685, PG 730, PG 750 and PG 770 may be connected directly to the Industrial
Ethernet H1 by means of a transceiver. You may then remotely modify the program of any PLC that
is connected to the LAN. The 923C co-ordinator or the programming multiplexer can also be used
to program a number of modules via a single connection.
The user services of LEVEL 4/4a (handler modules or libraries for PC-modules) are also available.
2.1.3 Structure and operation of the PLC interface
A dual-port RAM connects the CP143 H1 / TCP/IP directly to the back plane bus-LAN. At the PLC
the dual-port RAM is available as a standard-CP-interface with 4 tiles. Any H1 data traffic is
conducted via standard handler modules (SEND and RECEIVE).
per segment
connection cable 727-1
(max. 50m)
Repeater
Coaxial plug
Transceiver
CP1413plus
CP143plus
PC
Node (station)
Fig. 2-1:Example for the cabling of the Industrial Ethernet H1 LAN
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