DL06 Micro PLC User Manual, 3rd Edition, Rev. E
5-258
Chapter 5: Standard RLL Instructions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
B
C
D
Math - BCD (MATHBCD) (IB-521)
Math - BCD Format lets you enter complex mathematical expressions like you would in
Visual Basic, Excel, or C++ to do complex calculations, nesting parentheses up to 4 levels
deep. In addition to + - * /, you can do Modulo (% aka Remainder), Bit-wise And (&) Or
(|) Xor (^), and some BCD functions - Convert to BCD (BCD), Convert to Binary (BIN),
BCD Complement (BCDCPL), Convert from Gray Code (GRAY), Invert Bits (INV), and
BCD/HEX to Seven Segment Display (SEG).
Example: ((V2000 + V2001) / (V2003 - K100)) *
GRAY(V3000 & K001F)
Every V-memory reference MUST be to a single word BCD formatted value. Intermediate
results can go up to 32 bit values, but as long as the final result fits in a 16 bit BCD word,
the calculation is valid. Typical example of this is scaling using multiply then divide, (V2000
* K1000) / K4095. The multiply term most likely will exceed 9999 but fits within 32 bits.
The divide operation will divide 4095 into the 32-bit accumulator, yielding a result that will
always fit in 16 bits.
You can reference binary V-memory values by using the BCD conversion function on a
V-Memory location but NOT an expression. That is BCD(V2000) is okay and will convert
V2000 from Binary to BCD, but BCD(V2000 + V3000) will add V2000 as BCD, to V3000
as BCD, then interpret the result as Binary and convert it to BCD - NOT GOOD.
Also, the final result is a 16 bit BCD number and so you could do BIN around the entire
operation to store the result as Binary.
MATHBCD Parameters
• WORD Result: specifies the location where the BCD result of the mathematical expression will
be placed (result must fit into 16 bit single V-memory location)
• Expression: specifies the mathematical expression to be executed and the result is stored in
specified WORD Result. Each V-memory location used in the expression must be in BCD
format.
Parameter
DL06 Range
WORD Result
V
See DL06 V-memory map - Data Words
Expression
Text
DS
Used
HPP
N/A
