IDEC WindSRV - Manual (Page 112)

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examined for a value greater than 9 (A-F hex). If a hexadecimal value
between A and F is found, a range alarm is generated, indicating the
value is not within BCD range. Otherwise, the value is scaled with the
following algorithm:
Result=((Raw_value/999) * 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 3-digit BCD register using the following algorithm:
Result=(((InputData - Lo_egu) / Span_egu) * 999 + .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.
4BCD Signal Conditioning
Description 4-digit Binary Coded Decimal (BCD) value.
Input Range 0 - 9999.
Scaling Scales 4-digit Binary Coded Decimal values to the database block's
EGU range.
Read Algorithm Reads from a 4-digit BCD register. The Raw_value is then separated
into four nibbles (4 bits) prior to scaling the value. Each nibble is
examined for a value greater than 9 (A-F hex). If a hexadecimal value
between A and F is found, a range alarm is generated, indicating the
value is not within BCD range. Otherwise, the value is scaled with the
following algorithm:
Result=((Raw_value/9999) * 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 4-digit BCD register using the following algorithm:
Result=(((InputData - Lo_egu) / Span_egu) * 9999 + .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.
8AL Signal Conditioning
Description 8-bit binary number.
Input Range 0 - 255.
Scaling Scales 8-bit binary values to the database block's EGU range.
Read Algorithm Reads from a 16-bit register using the same algorithm as 8BN, and
returns a status indicating whether the value is out of range and in an
alarm state, or OK.
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 a 16-bit register using the same algorithm as 8BN, and
returns a status indicating whether the value is out of range and in an