Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 465)

Instruction Execution Times
Appendix C
Memory Usage,
C–11
Example: 1747-L524 series C processor, 30-slot configuration, (15) 1746-IA16,
(10) 1746-OA8, (1) 1747-DCM full configuration, (1) 1746-NI4, (1) 1746-NIO4I
50 XIC and XIO 50 x 1.00 = 50.00
15 OTE instructions 15 x 0.75 = 11.25
5 TON instructions 5 x 1.00 = 5.00
3 GRT instructions 3 x 1.50 = 4.50
1 SCL instruction 1 x 1.75 = 1.75
1 TOD instruction 1 x 1.00 = 1.00
3 MOV instructions 3 x 1.50 = 4.50
10 CTU instructions 10 x 1.00 = 10.00
10 RES instructions 10 x 1.00 = 10.00
Instruction Usage 98.00
30 rungs 30 x 0.375 = 11.25
100 data words 100 x 0.25 = 25.00
10 is highest data table file number
10 x 1 = 10.00
4 is highest program file number
4 x 2 = 8.00
User Program Total 163.50
49 I/O data words 49 x 0.75 = 36.75
30 slot 30 x 0.75 = 22.50
Overhead 204.00
I/O Configuration Total 263.25
Estimated total memory usage: 426.75
(round to 427)
4096 – 427 = 3669 instruction words remaining
in processor