Eaton ELC-PB, Programming Manual

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E L C P r o g r a m m i n g M a n u a l
F o r m o r e i n f o r m a t i o n v i s i t : w w w. e a t o n . c o m M N 0 5 0 0 3 0 0 3 E
3 - 3 1 2
API Mnemonic Operands Function
128 D POW P S
1
, S
2
, D Floating Point Power Operation
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
ELC ELCB ELCM
PB PC/PA/PH PV PB PH/PA
32 16 P 32 16 P 32 16 P 32 16 P 32 16 P
Operands:
S
1
: base address. S
2
: exponent. D : result
Description:
6. Perform the power operation to binary floating point S
1
to the power of S
2
and save the result
to D .
POW [ S
1
+1, S
1
]^[ S
2
+1, S
2
]= D. That is, S
1
to the power of S
2
.Only a positive number is valid
for S
1
. Result D needs to use two consecutive D-registers to accommodate the 32-bit floating
point value. S
1
and S
2
also need to be converted to floating point before executing the DPOW
instruction.
7. Error flags: M1067 and M1068, read D1067 and D1068.
If the absolute value of the result is larger than the maximum allowable floating point value, the
carry flag M1022= ON.
If the absolute value of the result is less than the minimum allowable floating point value, the
borrow flag M1021= ON.
If the conversion result is 0, zero flag M1020= ON.
Program Example:
1. When M0= ON, convert (D0, D1) and (D2, D3) to binary floating point and save the results in
register (D10, D11) and (D12, D13).
2. When M1= ON, use (D10, D11) and (D12, D13) to perform the power operation and save the
result in 32-bit register (D20, D21).
3. When M2= ON, convert (D20, D21) binary floating point 32-bit registers to decimal floating
point and save the result in register (D30, D31).