Siemens DTU3005-B Especificaciones descargar pdf (Pagina 42)

Loop Topology In loop topology the cable is connected in a similar manner to

straight-line topology. Rather than terminating the connection at

the farthest device, a complete loop is formed by bringing the

cable back to the supervisory device. Loop topology requires

more cable than straight-line topology, which adds expense to

the system and shortens the distance from the last device on

the loop to the supervisory device. The main advantage to loop

topology is the ability to continue to communicate with each

device if there is a break in the system.

Protocols Network protocols are rules that allow devices to communicate

with each other. A protocol identifies how devices should

identify each other, the form communicated data takes, and how

the data is interpreted at its final destination. Several protocol

standards have evolved in the electrical industry. Siemens

ACCESS supports the following protocols at various levels.

PROFIBUS DP PROFIBUS DP is an open bus standard for a wide range of

applications in various manufacturing and automation

applications. PROFIBUS DP works at the field device level such

as, power meters, I/O devices, motor protectors, circuit

breakers, and lighting controls. An advantage to PROFIBUS DP

is the ability to communicate between devices of different

manufacturers.

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Siemens DTU3005-B Especificaciones Pagina 42