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Communication Protocols and Standards

The ACCESS system allows a variety of devices to

communicate electronically. In the following illustration, for

example, several power meters are connected to a single

computer.

Straight-Line Topology Field devices can be connected to supervisory devices with

either straight-line or loop topology. In straight-line topology the

supervisory device connects to a field device, which in turn

connects to another field device, terminating at the farthest

device. Straight-line topology allows for longer runs; however, if

a break in the line should occur the supervisory device would

be unable to communicate with devices on the far side of the

break.

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Siemens DTU3005-B Spezifikationen Seite 41