Siemens Pacemaker UM344-2 Manuale Utente Scaricare il pdf (Pagina 38)

INSTALLATION UM344-2

September 1995

4.3.3.1 Analog Mode

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

Ÿ Analog operation employs a Point-To-Point Network comprising a Transmitter, Primary/Secondary

Master, and other non-signaling devices. Transmitter short address is 0 (zero).

Ÿ Use the optional Digital Meter for local indication of transmitter output.

Ÿ The Transmitter is factory configured for analog mode unless otherwise ordered.

Ÿ Use an MXC for configuration, diagnostics, and reporting the current process variable.

4.3.3.2 Digital Mode

Ÿ The number of Allowable Network Elements is:

Primary and Secondary Masters - 1 each

Transmitters - 1 to 15

Ÿ The process variable is transmitted digitally. The analog output of each transmitter is "parked" at 4

mA.

Ÿ The HART communication source can be a Primary or Secondary Master. A Primary Master can be

used for data acquisition, maintenance, or control purposes. A Secondary Master, the MXC for

example, may be used for configuration, diagnostics, and reporting current process variable.

Ÿ Use the optional Digital Meter for local indication of transmitter output.

Ÿ Place the transmitter in the digital mode by assigning it a SHORT ADDRESS from 1 to 15 when

configuring the TRANSMITTER ID BLOCK with the MXC (see Section 5).

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Siemens Pacemaker UM344-2 Manuale Utente Pagina 38