Allen-Bradley SLC 500 Series Reference Manual page 586

C-6 Memory Usage
Publication 1747-RM001G-EN-P - November 2008
SLC 5/01 Processor Memory Usage Example
1747-L514 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
15 OTE instructions
5 TON instructions
3 GRT instructions
1 SCL instruction
1 TOD instruction
3 MOV instructions
10 CTU instructions
10 RES instructions
Instruction Usage
30 rungs
10 data words
0
10 is highest data table file number
4 is highest program file number
User Program Total
49 I/O data words
30 slot
Overhead
I/O Configuration Total
Estimated total memory usage:
4096 - 290 = 3806 instruction words remaining in the processor
50 x 1.00 = 50.00
15 x 0.75 = 11.25
5 x 1.00 = 5.00
3 x 1.50 = 4.50
1 x 1.75 = 1.75
1 x 1.00 = 1.00
3 x 1.50 = 4.50
10 x 1.00 = 10.00
10 x 1.00 = 10.00
98.00
30 x 0.375 = 11.25
100 x 0.250 = 25.00
10 x 1.00 = 10.00
4 x 2.00 = 8.00
163.50
49 x 0.75 = 36.75
30 x 0.75 = 22.50
67.00
126.25
289.75
(round to
290)