Delta Electronics VFD-E manual Type Bit Devices Word devices, Bit command B15 B31 B16b15

Appendix D How to Use PLC Function

API	Mnemonic			Operands							Function
22	MUL		P		S1, S2, D						Multiplication
Type	Bit Devices					Word devices					Program Steps
OP	X	Y	M	K	H	KnX	KnY	KnM	T	C	D MUL, DMULP: 7 steps
S1				*	*	*	*	*	*	*	*
S2				*	*	*	*	*	*	*	*
D							*	*	*	*	*

Operands:

S1: Multiplicand S2: Multiplicator D: Product

Explanations:

1.In 16-bit instruction, D occupies 2 consecutive devices.

2.This instruction multiplies S1 by S2 in BIN format and stores the result in D. Be careful with the positive/negative signs of S1, S2 and D when doing 16-bit and 32-bit operations.

16-bit command:

S1 S2 D +1 D

b15 b0

X

b15 b0 b31 b16b15 b0

=

b15 is a symbol bit b15 is a symbol bit b31 is a symbol bit (b15 of D+1)

Symbol bit = 0 refers to a positive value.

Symbol bit = 1 refers to a negative value.

When D serves as a bit device, it can designate K1 ~ K4 and construct a 16-bit result, occupying consecutive 2 groups of 16-bit data.

Program Example:

The 16-bit D0 is multiplied by the 16-bit D10 and brings forth a 32-bit product. The higher 16 bits are stored in D21 and the lower 16-bit are stored in D20. On/Off of the most left bit indicates the positive/negative status of the result value.

X0

MUL D0 D10 D20

MUL D0 D10 K8M0

D-54 Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11