Mitsubishi Electric MELDAS C6 Programming Manual page 288

Program example
Program to obtain the No. of D10 data bits that are set to ON (1) when XB turns ON.
XB
10
8. Function Commands
SUM, SUMP
SUM D20
D10
Counter data
B15...................................................B0
D10 1 1 0 0 0 0 1 0
The total No. of bits set
to 1 is stored in D20.
Counting with SUM command
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Coding
No. of Com-
steps mand
10 LD
11 SUM
15
0 0 1 0 0 0 1 1
6
D20
Device
XB
D10 D20