Rockwell Automation D64046.5.1 U MNL WIN DDMC - Manual (Page 148)

Reference Information
Appendix A
A-4
PLC-5 Processor
To determine the amount of program memory used per SDS instruction in
the PLC-5 processor, use the following formula:
22 words + 3 words per I/O programmed
For example, consider that we have 2 SDS instructions with 4 inputs and 2
outputs each:
2 SDS instructions (22 words + 4 inputs (3) + 2 outputs (3)) =
2 (22 + 12 + 6) =
2 (40) =
80 words of program file memory
PLC-5/250 Processor
To determine the amount of program memory used per SDS instruction in
the PLC-5/250 processor, use the formula from Table A.F depending on
your number of I/O.
Table A.F
Formulas for Determining Amount of Program File Memory for SDS
Instructions in the PLC-5/250
Number of I/O: Formula:
8 226 words + (number of I/O points defined x 20) + x
16 258 words + (number of I/O points defined x 20) + x
32 322 words + (number of I/O points defined x 20) + x
For example, consider that we have 2 SDS instructions with 8 I/O
(4 inputs defined and 2 outputs defined):
2 SDS instructions (226 words + 4 inputs (20) + 2 outputs (20)) =
2 (226 + 80 + 40) =
2 (346) =
692 words of program file memory