Delta Electronics Extension Digital I/O Module DOP-EXIO14RAE - Manual (Page 136)

Appendix D Use of Application Instructions|DOP-EXIO Series
Revision March, 2008, Doc. Name: 2007PDD23000014 D-55
Mnemonic Operands Function
SUM D S D Sum of Active Bits
Bit Devices Word Devices
X Y M S K H KnX KnY KnM KnS T C D E F
S
D
y Note:
1. If S and D is used in device F, only 16-bit instruction is applicable.
16-bit instruction (5 Steps)
SUM
Continuous
execution
32-bit instruction (9 Steps)
DSUM
Continuous
execution
y Flags: M1020 (Zero flag)
Operands:
S
: Source device
D
: Destination device for storing counted value
Explanations:
1. Among the bits of S, the total of bits whose content is “1” will be stored in D.
2. When all the 16 bits of S are “0”, zero flag M1020 = On.
3. When 32- instruction is in use, D will occupy 2 registers.
Program Example:
When X10 = On, among the 16 bits of D0, the total of bits whose content is “1” will be stored in D2.
X10
SUM D0 D2
0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 K3
D2 D0