Mitsubishi Electric M800VW Series Programming Manual page 419

M800V/M80V Series PLC Programming Manual (1/2)
8 Function Instructions
8.11 Special Function Instructions
EXPD, EXPDP: Exponent operation on floating-point data (double precision)
Setting
Bit devices
data
X Y M L F
S
D
[Instruction symbol] [Execution condition]
EXPD
EXPDP
 Setting data
Setting data
Data for which the exponential value is obtained or the first number of the device
S
where data is stored.
D The first number of the device to store the operation result.
 Functions
EXPD
 Returns the exponent of the value designated by (S) and stores the operation result in the device designated by (D).
S+3 S+2 S+1 S
e
(
64-bit floating-point real
number
 Exponent operations are calculated with the base (e) as "2.71828".
 When the operation results in "-0" or an underflow occurs, the operation result is processed as "0".
 When setting input values from programming tools, rounding errors may occur.
For precautions when setting input values from programming tools, refer to "6.3.4 Single/Double-Precision Real Number
Data".
 Operation errors
 In the following cases, an arithmetic error occurs, the error flag (SM0) turns ON, and an error code is stored at SD0.
- The designated device value is not within the following range. (Error code: 35)
-1022
0, 2 ≤ | Designated device value | < 2
- The designated device value is "-0", unnormalized number, nonnumeric, or ± ∞ . (Error code: 35)
- The operation result exceeds the following range. (When an overflow occurs) (Error code: 36)
| Operation result | < 2
IB-1501667-B
Usable devices
B SB T SM V T C
○ ○
○ ○
Command
Command
Meaning
D+3 D+2 D+1
)
64-bit floating-point real
number
1024
1024
Word devices
D R/ZR W SW SD Z
○ ○ ○ ○ ○
○ ○ ○ ○ ○
D
398
Digit
Con-
Pointer designa- Index
stant
tion
E P
○
indicates the sign "EXPD".
S D
P S D
Data type
Real number
○