Siemens SIMATIC NET Spécifications Page 193

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Chapter 10. Configuring the I/O Driver from FIX/iFIX Applications183
See Also
Specifying Signal Conditioning in Database Manager
8AL 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/255) *
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 an 8-bit register using the
following algorithm:
Result = (((InputData –
Lo_egu)/Span_egu) * 255) + 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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