Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Emul, DEMUL, Demulp

3. Instruction Set

API	Mnemonic			Operands	Function
122	D	EMUL	P		Floating point multiplication

Controllers

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

DEMUL, DEMULP: 13

steps

S1

*

*

*

S2

*

*

*

D

*

16-bit

PULSE

32-bit

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

SE

SE

SE

Operands:

S1: Multiplicand

S2: Multiplicator D: Multiplication result

Explanations:

1.S1 ⋅ S2 = D. The floating point value in S1 is multiplied with the floating point value in S2 and the result is D. The multiplication 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 DEMULP instruction) and the drive contact is ON, the register will be multiplied 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 X1 = ON, binary floating point (D1, D0) multiplies binary floating point (D11, D10) and the result is stored in (D21, D20).

X1

DEMUL D0 D10 D20

Program Example 2:

When X2 = ON, K1234 (automatically converted into binary floating point value) multiplies binary floating point (D1, D0) and the result is stored in (D11, D10).

X2

DEMUL K1234 D0 D10

3 - 3 0 5