Specifications
CP143 H1 / TCP/IP manual Communication protocols
Rev. 00/07 2-1
2 Communication protocols
2.1 H1 protocol
The Industrial Ethernet H1 LAN provides the basis for the implementation of large, high-tech,
decentralized automation systems. Industrial Ethernet H1 is the complete solution for the
implementation of large, open networks between the different departments of a company.
Compatible devices include:
• PLCs 115, 135, 150, 155
• programmers PG 685, PG 730, PG 750, PG 770
• computers
• other PLCs
The Industrial Ethernet H1 LAN may be used in the following applications:
• central control and supervision of production lines
• monitoring and communicating the status of machines
• management information
• production statistics
• the transfer of large amounts of data
• remote programming of PLCs
2.1.1 Structure of Industrial Ethernet H1
The Industrial Ethernet H1 LAN consists of separate segments. A single segment can support up to
100 terminal devices (PLCs, computers) and its length may be up to 500 m. Individual segments
may be linked by means of repeaters. A maximum of 2 repeaters may be placed between any two
terminal devices.
Repeaters may also be used to construct so-called remote-repeater-configurations. This combination
requires two repeaters and two additional Industrial Ethernet H1 transceivers.
The LAN cable may either be the triaxial cable (yellow cable) or the thin ethernet-cable
(cheapernet).
Triaxial cable:
All terminal devices or repeaters must be connected to the transceivers by means of a drop-cable
(plug-in cable 727-1) (max. length 50 m). The connection between the bus cable and the transceiver
is provided by coaxial plugs. A terminator is required at both ends of the bus cable.
A transceiver on the triaxial cable may be connected to a multiport repeater that can support up to 8
terminal devices.
Thin-Ethernet:
Terminal devices are connected directly to the cable, that is transceivers and drop-cables are not
required. The bus cable is connected to the module by means of BNC plugs. A terminator is
required at both ends of the bus cable.