Delta DVP-ES2 User Manual download pdf (Page 420)

100

101

DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming

3-304

API Mnemonic Operands Function

121

D ESUB P

Floating point subtraction

Controllers

ES2/EX2 SS2 SA2

SX2

Bit Devices Word devices Program Steps Type

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

* * *

D *

DESUB, DESUBP: 13

steps

PULSE 16-bit 32-bit

ES2/EX2 SS2

SA2

SX2 ES2/EX2 SS2

SA2

SX2 ES2/EX2 SS2

SA2

SX2

Operands:

: Minuend S

: Subtrahend D: Subtraction result

Explanation:

1. S

− S

= D. The floating point value in S

is subtracted from the floating point value in S

and

the result is stored in D. The subtraction is conducted in binary floating point format.

2. If S

or S

is designated as constant K or H, the instruction will convert the constant into a

binary floating point value before the operation.

3. S

and S

can designate the same register. In this case, if the instruction is specified as

“continuous execution instruction” (generally DESUBP instruction) and the drive contact is ON,

the register will be subtracted once in every scan.

4. Flags: M1020 (Zero flag), M1021 (Borrow flag) and M1022 (Carry flag)

If absolute value of the result exceeds max. floating point value, carry flag M1022 = ON.

If absolute value of the result is less than min. floating point value, borrow flag M1021 = ON.

If the conversion result is 0, zero flag M1020 = ON.

Program Example 1:

When X0 = ON, binary floating point value (D1, D0) minuses binary floating point value (D3, D2) and

the result is stored in (D11, D10).

DESUB

D10

Program Example 2:

When X2 = ON, K1234 (automatically converted into binary floating point value) minuses binary

floating point (D1, D0) and the result is stored in (D11, D10).

K1234

DESUB

D0 D10

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Delta DVP-ES2 User Manual Page 420

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