Delta DVP-SS2 User Manual

DVP-ES2/EX2/EC5/SS2/SA2/SX2/SE&TP Operation Manual - Programming
3-420
API Mnemonic Operands Function
Controllers
ES2/EX2/
EC5
SS2
SA2
SE
SX2
126 D LOG P Float logarithm operation
Type
OP
Bit Devices Word devices Program Steps
X Y M S K H KnX KnY KnM KnS T C D E F
DLOG, DLOGP: 13 steps
S
1
*
*
*
S
2
*
*
*
D
*
PULSE
16-bit
32-bit
ES2/EX2/
EC5
SS2
SA2
SE
SX2
ES2/EX2/
EC5
SS2
SA2
SE
SX2
ES2/EX2/
EC5
SS2
SA2
SE
SX2
Operands:
S
1
: Base S
2
: Antilogarithm D: Operation result
Explanations:
1. Perform logarithm operation with S
1
as the base and S
2
as the antilogarithm and save the result
in D.
2. Only a positive number is valid for S. Register D has to be 32-bit format. Operation is conducted
in floating point value, so the value in S needs to be converted into floating value before
logarithm operation.
3. Logarithm operation: S
1
D
= S
2
, D = ?  Log
S1
S2
= D
Example: Assume S
1
= 5, S
2
= 125, S
1
D
= S
2
, D = ?  5
D
= 125  D = Log
S1
S2
= log
5
125
= 3.
4. Flags: M1020 (Zero flag), M1021 (Borrow flag) and M1022 (Carry flag).
If absolute value of the result is larger than max. floating value, carry flag M1022 = ON.
If absolute value of the result is smaller than min. floating value, borrow flag M1021 = ON.
If the conversion result is 0, zero flag M1020 = ON.
Program Example:
1. When M0 = ON, convert (D1, D0) and (D3, D2) to binary floating value and save the result in
register (D11, D10) and (D13, D12) individually.
2. When M1= ON, perform logarithm operation with (D11, D10) as base and (D13, D12) as
antilogarithm. The results are saved in register (D21, D20) in binary floating format.
3. When M2 = ON, convert the value in (D21, D20) into decimal floating point value and save the
result in (D31, D30). (At this time, D31 indicates powers of 10 for D30)
M0
RST M1081
M1
M2
DEBCD D20 D30
DFLT D0 D10
D2 D12
DLOG D10 D12 D20
DFLT

Delta DVP-SS2 Specifications

General

Brand	Delta
Model	DVP-SS2
Category	Controller
Language	English