Theory Of Operation; Unit Data Format - Omron SYSMAC C Series Operation Manual

Specifications and General Information
5-1-2

Theory of Operation

5-1-3 Unit Data Format

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The Unit converts field signals (voltage and current) to digital values that are
available to the CPU Unit's ladder program for processing. A microprocessor al-
lows the Unit to perform advanced functions on the converted data prior to being
accessible to the CPU Unit. The Unit's microprocessor reduces the amount of
ladder logic required to perform functions such as scaling, averaging, filtering,
peak hold, and alarms. These functions are executed in the Unit which reduce
the burden on the CPU Unit.
The Unit can be configured to report (output) data in two different formats. They
are signed BCD and 2's Complement Binary. These formats can be selected per
input point with the default set to BCD. In addition, the Unit memory map consists
of 16 bit words that contain either data or are bit oriented as flags or bits. The
following conventions are used when describing the Unit memory map locations
and their functions.
Data in the Unit memory map can be formatted in either signed BCD or 2's com-
plement binary. All values for a specific input point must be in the same format.
Some values are always entered in unsigned BCD. Refer to 5-5-2 Overview for
valid data ranges for all Unit memory map locations.
Format type
Signed BCD g
2's Complement Binary p y
Decimal range Memory map format
–7999 F999 (Bit 15 is the sign bit)
7999 7999
–32767 8001
–1 FFFF
0 0000
32767 7FFF
Section 5-1