Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual page 495

Special Math Instructions
Precautions
Flags
Example
00001
The following diagram shows the function of words D to D+N+1.
D Average value (after N or more executions)
D+1 Used by the system.
D+2 Content of S from the 1
D+3 Content of S from the 2
D+N+1 Content of S from the N
The average value is calculated in binary. Be sure that the content of S is in
binary.
N must be BCD from #0001 to #0064. If the content of N
operate with N=64.
The average value will be rounded off to the nearest integer value. (0.5 is
rounded up to 1.)
Set the contents of D+1 to #0000 to execute AVG(––) from the first scan.
Indirectly addressed DM word is non-existent. (Content of *DM word is
ER:
not BCD, or the DM area boundary has been exceeded.)
One or more operands have been set incorrectly.
D and D+N+1 are not in the same data area.
In the following example, the content of IR 200 is set to #0000 and then increm-
ented by 1 each cycle. For the first two cycles, AVG(––) moves the content of
IR 200 to DM 1002 and DM 1003. On the third and later cycles AVG(––) calcu-
lates the average value of the contents of DM 1002 to DM 1004 and writes that
average value to DM 1000.
@MOV(21)
#0000
200
AVG(––)
200
#0003
DM 1000
CLC(41)
ADB(50)
200
#0001
200
st
1 cycle
IR 200 0000
st
1 cycle
DM 1000 0000
DM 1001
DM 1002 0000
DM 1003 ---
DM 1004 ---
st
execution of AVG(––)
nd
execution of AVG(––)
th
execution of AVG(––)
Address Instruction
00000 LD
00001 @MOV(21)
00002 AVG(––)
00003 CLC(41)
00004 ADB(50)
nd rd th
2 cycle 3 cycle 4 cycle
0001 0002 0003
nd rd th
2 cycle 3 cycle 4 cycle
0001 0001 0002
0000 0000 0003
0001 0001 0001
--- 0002 0002
Section 7-23
#0065, AVG(––) will
Operands
00001
# 0000
200
200
# 0003
DM 1000
200
# 0001
200
Average
Used by the system.
Previous
values of
IR 200
477