Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 290)

Chapter 20
Math Instructions
20–14
Example 2 (Fixed, SLC 5/01, and SLC 5/02 Processors)
In the following example, the integer value 32760 stored at N7:3 is converted
to BCD. The 5-digit BCD value is stored in the math register. The lower 4
digits of the BCD value is moved to output word O:2 and the remaining digit
is moved thru a mask to output word O:3.
When using the math register as the destination parameter in the TOD
instruction, the maximum BCD value possible is 32767. However, for BCD
values above 9999, the overflow bit is set, resulting in minor error bit S:5/0
also being set. Your ladder program can unlatch S:5/0 before the end of the
scan to avoid major error 0020, as done in this example.
TOD
TO BCD
Source
N7:3
32760
Dest S:13
00032760
(U)
S:5
0
] [
S:0
1
APS displays S:13 and S:14
in BCD.
MOV
MOVE
Source
S:13
10080
Dest O:2.0
10080
MVM
MASKED MOVE
Source
S:14
3
Mask 000F
Dest O:3.0
3
] [
0 0 0 3 2 7 6 0
3 2 7 6 0
0 0 15 15
N7:3 Decimal
S:13 & S:14 5–digit BCD
S:14 S:13
This example will output the absolute value (0–32767) contained in N7:3 as 5 BCD digits in output slots 2 and 3.
Minor Error Bit
0010 0111 0110 0000
0000 0000 0000 0011
Overflow bit
2 7 6 0
3
F1 F2 F3 F4 F5
ZOOM on TOD –(TOD)– 2.3.0.0.2
NAME: TO BCD
SOURCE: N7:3 32760
DEST: S:13 10080
EDT_DAT
Destination is displayed as
10080, decimal
(equivalent to 2760 BCD).