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SPECIFICATIONS
3.2 Function List
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OVERVIEW
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3.2 Function List
The following table shows the functions of the QD64D2.
I/O numbers (X/Y) and buffer memory addresses in Description describe only for channel
1.
For I/O numbers (X/Y) of channel 2 and buffer memory addresses, refer to Section 3.3.1.
* 1 The functions can be used in combination.
However, as for the following functions, select either of them.
• Linear counter function, ring counter function
• Coincidence output function, continuous comparison function
Table 3.2 Function list of the QD64D2
Function
*1
Description Reference
Linear counter function
Counts within the range from -2147483648 to 2147483647.
An overflow occurs when a count exceeds the count range.
Section 5.2.1
Ring counter function
Repeats a count between the ring counter upper limit value
and the lower limit value.
Section 5.2.2
Counter
value
comparison
function
Coincidence output
function
Compares preset coincidence detection point of an arbitrary
channel with the present counter value and outputs the
counter value coincidence.
Section 5.3.1
Continuous comparison
function
Compares any of preset coincidence detection points of an
arbitrary channel with the present counter value and
outputs the counter value coincidence during the set time
after the coincidence.
Section 5.3.2
Coincidence output
test function
Checks wiring of coincidence output.
This function can be used only when the continuous
comparison function is selected.
Section 5.3.3
Coincidence detection
interrupt function
Generates an interrupt signal to the programmable
controller CPU when a coincidence is detected, and starts
an interrupt program.
Section 5.3.4
Preset function Overwrites present value to an arbitrary value. Section 5.4
Latch counter function Latches the present value. Section 5.5