Publication 1747-RM001G-EN-P - November 2008
Memory Usage C-13
Data Words
Files 0 and 1
In the SLC 5/02 processor, each I/O data word consumes 0.75 words of
memory. In the SLC 5/03 processor, each I/O data word consumes 3 words
of data.
File 2
The status file word usage is contained in the overhead values for both the
SLC 5/02 and SLC 5/03 processors.
File 3 to 255
In the SLC 5/02 processor, 4 data words consume the same amount of
memory as 1 instruction word. This is why the SLC 5/02 processor is said to
offer 4K of Instruction words or 16K of Data words. This dynamic amount of
Data word storage is due to the architecture of the SLC 5/02’s
microprocessor.
SLC 5/03, SLC 5/04, and
SLC 5/05 Processor
The following table shows memory usage times for the SLC 5/03, SLC 5/04,
and SLC 5/05 processors. Instructions that support floating point are included
within this table. When using a SLC 5/03 processor, it is important to
remember that 1 instruction word equals 1 data word.
Table C.5 SLC 5/03, SLC 5/04 and SLC 5/05 List of Instructions
Mnemonic
FP = floating
point
Applies to SLC Memory Usage
(user words)
Name Instruction Type Page
OS300
OS301, OS400
OS302, OS401, OS501
OS302, OS401,
OS501 Series C
OS302, OS401,
OS501 Series C, FRN 10+
ABL • • • • 2.00 Test Buffer for Line ASCII 10-6
ABS • • • • • 2.00 Absolute Math 4-24
ABS FP • • • 2.00 Absolute Math 4-24
ACB • • • • 2.00 Number of Characters in Buffer ASCII 10-7
ACI • • • • 2.00 String to Integer ASCII 10-8
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