Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Esub, DESUB, Desubp

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

API Mnemonic Operands Function Controllers

121

D

ESUB

P

Floating point subtraction

ES2/EX2

SS2 SA2 SX2

SE

Type

Bit Devices

Word devices

Program Steps

OP

X

Y

M

S

K

H KnX KnY KnM KnS T

C

D

E

F

DESUB, DESUBP: 13

S1

*

*

*

steps

S2

*

*

*

D

*

PULSE

16-bit

32-bit

SA2

SA2

SA2

ES2/EX2 SS2 SE SX2 ES2/EX2 SS2

SE

SX2 ES2/EX2 SS2 SE

SX2

Operands:

S1: Minuend S2: Subtrahend D: Subtraction result

Explanation:

1.S1 − S2 = D. The floating point value in S2 is subtracted from the floating point value in S1 and the result is stored in D. The subtraction is conducted in binary floating point format.

2.If S1 or S2 is designated as constant K or H, the instruction will convert the constant into a binary floating point value before the operation.

3.S1 and S2 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).

X0

DESUB D0 D2 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).

X2

DESUB K1234 D0 D10

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