
170 Siemens Simatic S7 Driver Online Help
Parameters for 12AL Signal Conditioning
Description 12-bit binary number.
Input Range 0 – 4095.
Scaling Scales 12-bit binary values to the
database block’s EGU range.
Read
Algorithm
Reads from a 16-bit register using
the same algorithm as 12BN, and
returns a status indicating whether
the value is out of range and in an
alarm state, or OK.
Result = ((Raw_value/4095) *
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.
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