8 Application Instructions API 100-149
DVP-PLC Application Manual
8-37
API Mnemonic
Operands
Function
126
D LOG P
Logarithm of Binary Floating Point
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
*
DLOG, DLOGP: 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 operation source
D
: Device for operation result
Explanations:
1. See the specifications of each model for their range of use.
2. Flags: M1020 (zero flag); M1021 (borrow flag); M1022 (carry flag)
3. This instruction performs “log” operation of the content in
S
1
and
S
2
and stores the result in
D
.
4. Only positives are valid for the content in
S
1
and
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.
5.
S
1
D
=
S
2
,
D
= ? Log
S
1
S
2
=
D
Example: Assume
S
1
= 5,
S
2
= 125,
D
= log
5
125
= ?
S
1
D
=
S
2
5
D
= 125
D
= log
5
125
= 3
6. If the absolute value of the result
>
maximum floating point available, the carry flag M1022 = On.
7. If the absolute value of the result
<
minimum floating point available, the borrow flag M1021 = On.
8. 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 log 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
DLOG
D0
D10
Remarks:
Содержание DVP-PLC
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