Siemens SIMATIC NET Spezifikationen Seite 182

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172 Siemens Simatic S7 Driver Online Help
See Also
Specifying Signal Conditioning in Database Manager
15AL Signal Conditioning
Signal conditioning defines how the process database scales incoming data.
Read
Algorithm
Reads from a 16-bit register using
the following algorithm:
Result = ((Raw_value/32767) *
Span_egu) + Lo_egu.
Read
Algorithm
Variables
Lo_egu – the database block’s low
engineering value.
Span_egu – the span of the
engineering values.
Raw_value – the value stored in the
field device’s register.
Result – the scaled value stored in
the database block.
Write
Algorithm
Writes to a 16-bit register using the
following algorithm:
Result = (((InputData –
Lo_egu)/Span_egu) * 32767) + 0.5.
Write
Algorithm
Variables
Lo_egu – the low engineering value.
Span_egu – the span of the
engineering values.
InputData – the database block’s
current value.
Result – the value sent to the process
hardware.
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