Siemens DTU3005-B Spezifikationen PDF herunterladen (Seite 43)

ModBus RTU ModBus RTU is a protocol originally developed by MODICON,

which is now part of Schneider Automation. ModBus RTU

protocol has been widely used by other companies.

DNP 3.0 Distributed Network Protocol 3.0 (DNP 3.0) was developed by

Harris Distributed Automation Products. This protocol is an

open and public protocol based on standards developed by the

International Electrotechnical Commission (IEC). This protocol is

often used by large power utility companies.

SEABus and SEABus Plus The rules that govern the communication of the ACCESS

system are known collectively as SEABus and SEABus Plus.

Both protocols are used to communicate between supervisory

and field devices. SEABus and SEABus Plus are open protocols

available to anyone who wants to connect their equipment to

the ACCESS system.

A supervisory device can support unlimited field devices. Each

field device in the ACCESS system has a unique address. A

packet is simply a unit of data that is routed between an origin

(supervisory device) and a destination (field device). Data bytes

are grouped into packets containing from 5 to 260 characters.

Data bytes contain a unique address for a given field device and

instructions for the field device.

A supervisory device, for example, may initiate communication

by sending a packet requesting information such as voltage

from a specific field device. The field device would respond by

sending a packet back with the requested information.

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Siemens DTU3005-B Spezifikationen Seite 43