Multiplication - Delta Electronics AC Motor Drive VFD-E User Manual

Appendix D How to Use PLC Function|
API Mnemonic
22 MUL
Type Bit Devices
OP
X Y
S
1
S
2
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:
b15..........b0
b15 is a symbol bit
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.
D-54
Operands
P S , S , D
1 2
Word devices
M K H KnX KnY KnM T
* * *
* * *
S1 S2
b15..........b0
X
b15 is a symbol bit
Symbol bit = 0 refers to a positive value.
Symbol bit = 1 refers to a negative value.
X0
MUL
MUL

Multiplication

C D
* * * * *
* * * * *
* * * * *
D +1
b31..........b16b15..............b0
=
b31 is a symbol bit (b15 of D+1)
D0 D10
D0 D10
Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11
Function
Program Steps
MUL, DMULP: 7 steps
D
D20
K8M0