Delta DVP-10PM, Applications Manual

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5
Categories and Use of Basic Application Instructions
DVP-PM Operation Instruction
5-46
API Mnemonic Operands Function
29 D NEG P 2’s Complement (Negation)
Controllers
20PM 10PM
Bit Devices Word Devices Program Steps
Type
OP
X Y M S K H KnX KnY KnM KnS T C D V Z
D * * * * * * * *
NEG, NEGP: 7 steps
DNEG, DNEGP: 9 steps
Operands:
D
: Device to store the operation result of 2’s Compliment
Explanations:
1. NEG instruction conducts operation of 2’s complement and can be used for converting a negative BIN value into
an absolute value
2. When NEG is used as 16-bit instruction, Z device cannot be adopted; when NEG is used as 32-bit instruction, V
device cannot be adopted.
3. This instruction is generally used in pulse execution mode (NEGP, DNEGP).
Program Example 1:
When X0 goes from OFF to ON, the phase of each bit in D10 will be reversed (0
→
1, 1
→
0) and then 1 will be added
to the Least Significant Bit (LSB) of the register. Operation result will then be stored in D10.
X0
NEGP D10
Program Example 2:
To obtain the absolute value of a negative value:
1. When MSB (b15) of D0 is “1”, M0 = ON. (D0 is a negative value)
2. When M0 = ON, the absolute value of D0 can be obtained by NEG instruction.
M1000
BON D0 K15 M0
M0
NEGP D0
Program Example 3:
Obtain the absolute value of the remainder of the subtraction. When X0 = ON,
1. If D0 > D2, M0 = ON.
2. If D0 = D2, M1 = ON.
3. If D0 < D2, M2 = ON.
4. D4 is then able to remain positive.
X0
CMP D0 D2 M0
M0
SUB D0 D2 D4
M2
SUB D2 D0 D4
M1