Delta Electronics AH500, Manual

Page: 196 / 547

C h a p t e r 5 A p p l i e d I n s t r u c t i o n s
5 - 8 1
API Instruction code Operand Function
120 D EADD P S
1
, S
2
, D
Binary floating-point
addition
Device X Y M S K 16# F KnM KnS D W T C V Z
S
1

 
S
2

 
D
 
Pulse instruction 16-bit instruction 32-bit instruction (9 steps)

–

E xp la nat io n

The binary floating-point value in S
2
is added to the binary floating-point
value in S
1
, and the sum is stored in D .

S
1
: Augend; S
2
: Addend; D : Sum

If S
1
is a floating-point value, the instruction will be used to add the
binary floating-point value in S
2
to the floating-point value. If S
2
is a
floating-point value, the instruction will be used to add the floating-point
value to the binary floating-point value in
S
1
.

S
1
and S
2
can be the same register. If the instruction DEADD is used
under the circumstances, the value in the register is added to itself
whenever the conditional contact is ON in a scan cycle. Generally, the
pulse instruction DEADDP is used.

If the absolute value of an oepration result is greater than the maximum
floating-point value available, a carry flag will be ON.

If the absolute value of an oepration reuslt is less than the minimum
floating-point value available, a borrow flag will be ON.

If an operation result is 0, a zero flag will be ON.

SM1064 is the zero flag in an Ox motion subroutine, and SM968 is the
zero flag in O100.

SM1065 is the borrow flag in an Ox motion subroutine, and SM969 is the
borrow flag in O100.

SM1066 is the carry flag in an Ox motion subroutine, and SM970 is the
carry flag in O100.
E xamp le 1

When X0.0 is ON, the binary floating-point value in (D3, D2) is added to
the binary floating-point value in (D1, D0), and the sum is stored in (D11,
D10).
X0.0
DEADD D0 D2 D10
E xamp le 2

When X0.2 is ON, F1234.0 is added to the binary floating-point value in
(D11, D10), and the sum is stored in (D21, D20).
X0.2
DEADD D10 F1234. 0 D20
A dditio nal

re m ark
Please refer to section 5.3 for more information about performing
operations on floating-point numbers.