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If 0002 is ON, the following diagram clears CY with CLC(41), adds the con-
tent of IR 02 to a constant (6103), places the result in DM 01, and then
moves either all zeros or 0001 into DM 02 depending on the status of CY
(1904). This ensures that any carry from the last digit is preserved in R + 1 so
that the entire result can be later handled as eight-digit data.
TR 0
MOV(21)
#0001
DM 02
0002
CLC(41)
ADD(30)
02
#6103
DM 01
MOV(21)
#0000
DM 02
1904
1904
Address
Instruction
Operands
0000
LD
0002
0001
OUT
TR
0
0002
CLC(41)
0003
AND(30)
02
#
6103
DM
01
0004
AND
1904
0005
MOV(21)
#
0001
DM
02
0006
LD
TR
0
0007
AND NOT
1904
0008
MOV(21)
#
0000
DM
02
Consecutive ADD(30)s can be used to perform eight-digit BCD addition. By
using two ADD(30)s and combining the augend and the addend words of one
ADD(30) with those of the other, two 8-digit values can be added. The result
may or may not be 9 digits depending on whether a carry is generated.
0000
LD
0002
0001
DIFU(13)
1000
0003
LD
1000
0004
OUT
TR
0
0005
CLC(41)
0006
AND(30)
DM
00
DM
02
DM
04
0007
AND(30)
DM
01
DM
03
DM
05
0008
AND
1904
0009
MOV(21)
#
0001
DM
06
0010
LD
TR
0
0011
AND NOT
1904
0012
MOV(21)
#
0000
DM
06
TR 0
MOV(21)
#0001
DM 06
1000
CLC(41)
ADD(30)
DM 00
DM 02
DM 04
MOV(21)
#0000
DM 06
1904
1904
0002
DIFU(13) 1000
ADD(30)
DM 01
DM 03
DM 05
Address
Instruction
Operands
In the above program the 8 digit augend consists of two words: DM 00 and
DM 01, with DM 01 being used for the 4 left digits and 00 for the 4 right dig-
its. Similarly the 8-digit addend consist of DM 02 and 03. Three words are
used to hold the results of the addition: DM 04, DM 05, and DM 06. In this
Example
BCD Calculations
Section 5-16
Summary of Contents for SYSMAC C20K
Page 1: ...Cat No W146 E1 5 Programmable Controllers SYSMAC C20K C28K C40K C60K ...
Page 2: ...K type Programmable Controllers OPERATION MANUAL Revised July 1999 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 19: ...7 SECTION 2 Hardware Considerations 2 1 Introduction 2 2 Indicators 2 3 PC Configuration ...