17.1 PLC Connection 17-9
Indirect Device Memory Designation
Device memory other than String, Timer, Counter, and Control
Example: Indirect device memory designation of “N20.100”
N20.100
B(Data Table Element)
A(Data Table Number)
Converting A to binary
20(DEC)= 10100(BIN)
11 10 09 08 07 06 05 04 03 02 01 00
000000010100
X
Y
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
0101000001100100
Y Z
0000100100000010 (BIN) = 4064 (HEX): Lower address number
0000000000000001 (BIN) = 1 (HEX): Higher address number
Arranging the values X, Y and Z in the following order
Converting B to binary
100(DEC)= 1100100(BIN)
11 10 09 08 07 06 05 04 03 02 01 00
000001100100
Z
n + 1 (lower address number)
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
0000000000000001
X0 fixed
n + 2 (higher address number)