Pepperl+Fuchs OMR150M-R1000 Series, Руководство пользователя

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Distance Sensors
Appendix
9 Appendix
9.1 Description of Interfaces
9.1.1 General
Process data: Format
The data is transmitted serially at all interfaces. A distance value, as well as any error informa-
tion (status flags) and the status of the I/O pins, are always output as process data. Depending
on the interface, the process data composition is defined as either fixed (e.g., SSI) or configu-
rable (e.g., PROFIBUS). For details, please refer to the description of the individual interfaces.
Process data: Distance value
The distance value is transmitted as binary data. The number of bytes used and the byte order
(Little Endian, Big Endian) are configured according to the interface.
The resolution of the distance value transmitted in the process data can be configured via the
"Measured value resolution" parameter (|). When configuring this resolution, the value of the
LSB can be set to 0.1 mm or 1 mm. The "1 mm/bit" resolution is the default selection.
In the event of an error (depending on the "error substitute value" parameter setting), the last
valid measured value or the value zero is output. If the "last measured value" setting does not
have a valid measured value, the largest value that can be displayed in the process data (e.g.,
0xFFFFFFFF
) is output.
9.1.2 SSI
Figure 9.1 SSI data telegram
24 data bits are transmitted in the Gray code, and 1 error bit. The error bit is transmitted
uncoded. The code for the distance value is selected from the menu.
Binary Code:
Gray code:
Data Telegram:
Bit D0 Error bit: 0 = no error, 1 = error
Bit D24 ... D1 Distance value, binary-coded with variable resolution (see "Measured value
resolution")
Bit D0 Error bit: 0 = no error, 1 = error
Bit D24 ... D1 Distance value, Gray-coded with variable resolution (see "Measured value
resolution")
MSB LSB
SSI
Error
Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit
D24 D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1
Bit
Entfernungswert