Mitsubishi Electric MELSEC-Q/L - From BCD Format Data to Floating-Point Data

592
7 APPLICATION INSTRUCTIONS
7.11 Character String Processing Instructions
From BCD format data to floating-point data
EREXP(P)
*1 Applicable for the Universal model QCPU, LCPU.
Processing details
• Converts the BCD type floating point data designated by (S1) to the 32-bit floating decimal point real number data
according to the decimal fraction digits specified by (S2), and stores the result into the area starting from the device
designated by (D).
• The sign at (S1) and the sign for the exponent at (S1) +3 is set at 0 for a positive value and at 1 for a negative value.
• 0 to 38 can be set for the BCD exponent of (S1)+4.
• 0 to 7 can be set for the decimal fraction digits of (S2).
(S1): Head number of the devices where BCD type floating point format data is stored (BIN 16 bits)
(S2): Decimal fraction digits data (BIN 16 bits)
(D): The device where the converted 32-bit floating point real number data will be stored (real number)
Setting
data
Internal device R, ZR J\ U\G Zn Constant
K, H
Others
Bit Word Bit Word
(S1)   
(S2)   
(D)   
*1

Process
High
performance
Redundant Universal LCPU
Basic
Command
Command
EREXPP
EREXP
EREXPP
D
S1 S2
D
S2
S1
EREXP
BCD
floating-point
format
Sign
BCD 7 digits
Sign (for exponent)
BCD exponent
+4
+3
+2
+1
Positive: 0
Negative: 1
Positive: 0
Negative: 1
(0 to 38)
32-bit floating-point
real number
+1
Number of digits in decimal fraction
(0 to 7)
D
S1
S1
S1
S1
S1
S2
D
S1
S1
S1
S1
S1
S2
BCD
floating-point
format
1
5423
H
0321H
0
2
+4
+3
+2
+1
6
(Number of digits in decimal fraction)
(Sign)
3215423
H (BCD 7 digits)
(Sign (for exponent))
(BCD exponent)
+1
DD
423E+2-3.215