Delta DVP-PLC, Applications Manual

Page: 442 / 586

8 Application Instructions API 100-149
DVP-PLC Application Manual 8-40
API Mnemonic Operands Function
128 D POW P
Floating Point Power Operation
Controllers
ES/EX/SS SA/SX/SC EH/SV
Bit Devices Word Devices Program Steps Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S
1
* * *
S
2
* * *
D *
DPOW, DPOWP: 13 steps
PULSE 16-bit 32-bit
ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV
Operands:
S
1
: Device for base.
S
2
: Device for exponent.
D
: Device for operation result
Explanations:
1. See the specifications of each model for their range of use.
2. This instruction performs power multiplication of binary floating point
S
1
and
S
2
and stores the result in
D
.
D
= POW
［
S
1
+ 1,
S
1
］
^
［
S
2
+ 1,
S
2
］
3. Only positives are valid for the content in
S
1
. Both positives and negatives are valid for the content in
S
2
. When
designating
D
registers, the data should be 32-bit and the operation should be performed in floating point
system. Therefore,
S
1
and
S
2
should be converted into floating point values.
Example: When
S
1
S2
=
D
,
D
= ?
Assume
S
1
= 5,
S
2
= 3,
D
= 5
3
=125
4. If the absolute value of the result
＞
maximum floating point available, the carry flag M1022 = On.
5. If the absolute value of the result
＜
minimum floating point available, the borrow flag M1021 = On.
6. If the result = 0, the zero flag M1020 = On.
Program Example:
1. When M0 = On, convert (D1, D0) and (D3, D2) into binary floating points and store them in the 32-bit registers
(D11, D10) and (D13, D12).
2. When M1= On, perform POW operation on the binary floting points in 32-bit registers (D11, D10) and (D13,
D12) and store the result in the 32-bit register (D21, D20).
3. When M2 = On, convert the binary floating point (D21, D20) into decimal floating point (D30 × 10
[D31]
) and store
it in register (D31, D30).
M0
RST M1081
M1
D10 D12
M2
DEBCD D20 D30
D2 D12
D20
DFLT
DFLT
DPOW
D0
D10
Remarks: