IDEC MICROSmart FC6A Series, User Manual

Page: 268 / 578

5: F
UNCTIONS AND
S
ETTINGS
5-22 FC6A S
ERIES
MICROS
MART
U
SER
’
S
M
ANUAL
FC9Y-B1722
Example: Group 1, number of comparisons is 3, set to device address D0
When the current value matches preset value 1, Current Comparison Number becomes 2 and 3 is stored in Next Comparison
Number .
When the device address is configured as D0, Current Comparison Number is stored in D1 and Next Comparison Number is
stored in D2.
For the group 1 preset value, the value of the data registers (D4, D5) allocated to preset value number 1 is stored in D8212 and
D8213 as shown in the table above and it is compared to the current value.
Note: When the Next Comparison Number preset value becomes active, the high-speed counter preset value during execution does not change,
even when the preset value for that preset value number is changed. When the current value and the current preset value match, the preset value
with the number stored in
Next Comparison Number becomes active. Changes to the Next Comparison Number data register must be
performed before the preset value becomes active.
Counting State
Count
Before action
Count
Action start
Current value
and preset
value 1
matched
Current value
and preset
value 2
matched
Current value
and preset
value 3
matched
Current
Comparison
Number (D1)
0
→
1
→
2
→
3
→
1
Next
Comparison
Number (D2)
1
→
2
→
3
→
1
→
2
Preset value 1 is set to
Current Comparison
Number
Preset value 2
is set.
Preset value 3
is set.
Once again, preset
value 1 is set.
Repeat
Before the count action, set Current
Comparison Number to 0, and set
Next Comparison Number and preset
values 1 to 3 to the count values with the
initialize pulse in the user program.