Delta-electronics Programmable Logic Controller DVP-PLC Instrukcja Użytkownika Pobierz pdf (Strona 256)

100

101

6 Application Instructions API 00-49

DVP-PLC Application Manual

6-44

API Mnemonic Operands Function

D NEG P

2’s Complement (Negative)

Controllers

ES/EX/SS SA/SX/SC EH/SV

Bit Devices Word Devices Program Steps Type

X Y M S K H KnX KnY KnM KnS T C D E F

* * * * * ***

NEG, NEGP: 3 steps

DNEG, DNEGP: 5 steps

PULSE 16-bit 32-bit

ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV

Operands:

D: Device to store 2’s complement

Explanations:

1. If D is used in device F, only 16-bit instruction is applicable.

2. See the specifications of each model for their range of use.

3. This instruction converts a negative BIN value into an absolute value.

4. This instruction adopts pulse execution instructions (NEGP, DNEGP).

Program Example 1:

When X0 = Off→On, the phase of every bit of the content in D10 will be reversed (0→1, 1→0) and pluses 1. The

result will then be stored in D10.

NEGP D10

Program Example 2:

Obtaining the absolute value of a negative value:

a) When the 15

bit of D0 is “1”, M0 = On. (D0 is a negative value).

b) When M0 = Off→On, NEG instruction will obtain 2’s complement of D0 and further its absolute value.

M1000

BON

D0 K15

NEGP D0

Normal ON contact

Program Example 3:

Obtaining the absolute value by the remainder of the subtraction. When X0 = On,

a) If D0 > D2, M0 = On.

b) If D0 = D2, M1 = On.

c) If D0 < D2, M2 = On.

d) D4 is then able to remain positive.

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