Siemens SITRANS P Manual do Utilizador descarregar pdf (Página 62)

Installation UMSITRPDS3-1

November 2010

4-10

4.3.4 Transmitter Operating Mode and Network Type

A transmitter outputs either an analog current or an equivalent digital signal, depending upon the selected

operating mode. The operating mode also determines the type of network (Point-to-Point or Multi-Drop)

to be installed, as shown in Table 4-1 and the following subsections.

TABLE 4-1 Operating Mode and Network

OPERATING MODE NETWORK TYPE NETWORK FIGURE(S)

Analog Point-to-Point 4-6, 4-7, and 4-8

Digital Multi-Drop 4-9

4.3.4.1 Analog Mode

When a transmitter is configured for analog mode operation, the following statements apply.

• The transmitter outputs a 4-20 mA signal for input to devices such as controllers and recorders.

• A Point-to-Point network is used comprising a transmitter, Primary/Secondary Master, and other non-

signaling devices. The transmitter polling address is 0 (zero).

Point-to-Point networks are shown in Figures 4-6, 4-7, and 4-8.

• The optional display can be used for local indication of transmitter output.

• Each transmitter is factory configured for analog mode unless otherwise ordered. The polling address

is set to zero (0).

• A Model 275 HART Communicator is used for configuration, diagnostics, and reporting the current

process variable.

Note: If using a Model 375 Field Communicator, see the inside of the front

cover of this manual.

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Siemens SITRANS P Manual do Utilizador Página 62