IDEC FT1A-B12RA, User Manual

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ANUAL
FT9Y-B1378 5-17
5: S
PECIAL
F
UNCTIONS
Comparison Actions
The operating condition when comparing values is configured in the WindLDR High-speed Counter Settings , under
Comparison Action .
The action when comparing values is Comparison Output or Interrupt Program , so specify an external output number or
label number when comparing. However, the interrupt program can only be used when ladder program is selected as the
programming language.
Operation
When the preset value and the current value are compared and the values match, the specified output is turned on or the interrupt
program is executed.
A maximum of six high-speed counter preset values can be configured. For one preset value, the current value is compared with
the same preset value each time.
When multiple preset values are configured, the preset value is changed each time the current value and preset value match.
For example, if four preset values are configured, when preset value 1 matches the current value, the comparison subject changes
to preset value 2
→
3
→
4 in order.
When the final preset value 4 matches the current value, the preset value returns to preset value 1 and the values are compared.
•
Preset value storage locations
The preset values during high-speed counter operation are stored as 2 words in special data registers.
Specify the data registers to store the preset values in WindLDR and store those preset values in the user program. Specify the
start address of the data registers to allocate the data registers to the individual settings in the comparison settings. When the
high-speed counter is executed, the preset value with the number stored in
Current Preset Value Number is active. The active
preset value number for each comparison is stored in Current Preset Value Number and the next active preset value number is
automatically stored in Next Preset Value Number . By changing the value of Next Preset Value Number in the user
program, the next active preset value number can be changed. The active preset value is stored for each group in the special data
registers shown in the table above.
Group
1
(I0 to I1)
2
(I2)
3
(I3 to I4)
4
(I5)
5
(I6)
6
(I7)
Read/Write
Preset Value (Upper word) D8052 D8058 D8064 D8070 D8136 D8142
R
Preset Value (Lower word) D8053 D8059 D8065 D8071 D8137 D8143