SILVER AUTOMATION INSTRUMENTS LTD.

Ultrasonic Level Meter PROFIBUS-DP Communication

Technical Specification

PROFIBUS-DP/V0 protocol, meets the PROFIBUS specification---the third part of the GB/T20540-2006 Digital data communication for measurement and control Field bus for use in industrial control systems.

Standard PROFIBUS-DP driven interface, the supported baud rate is adaptive, with the maximum baud rate is 12M.


ID number

The ID number of the instrument is defined as 99A6H.


Addressing

The instrument used as a slave, the effective address range is 0 -126 (decimal). The Ultrasonic Level Meter can be set by the button on the instrument or by the operator, there is no dipswitch setting mode.


Cable connection and termination resistors

There is no D-type connector in the instrument, the PROFIBUS cable can be fixed through the self-clamping terminal signal A, B.

As the instrument is at the end of bus, all the terminal resistors should be switch to ON position, to ensure that they can work. As the Ultrasonic Level Meter is not at the end of bus, all the terminal resistors should be switch to NO-ON position. Please see previous section about the instrument wiring description


GSD file

The file is HLML_99A6.GSD, placed in the CD-ROM which is provided with the instrument.


PROFIBUS input

When set C-ab to C-00, the PROFIBUS input is the one word hexadecimal level value, namely 0000H~0FFFFH, which corresponds to the decimal level value of 0 ~ 65535mm.

When set C-ab to C-01, the PROFIBUS input is the one word hexadecimal empty value. The unit is millimeter.


PROFIBUS output

None. The instrument doesn’t need the PROFIBUS output sent by the master.

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