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4. Functions
54
CNT-3208M-PE
Hardware event
Types of hardware events
This product operates automatically in response to changes to the control input signal, control output
signal status, and count matches. These are generically called hardware events.
One control input signal line and one control output signal line are provided for each channel.
Table 4.6. Hardware event
Item Purpose Condition
Control input signal *1 Preset
Rise(Low
→
High)
Fall(High → Low)
Zero-clear Rise(Low → High)
Fall(High
→
Low)
Counter start/stop Rise(Low → High)
Fall(High → Low)
Control output signal *2 Count match(Register 0) Count value = Comparison register 0
Count match(Register 1) Count value = Comparison register 1
Abnormal input error When phases-A and B are changed at the
same time
Digital filter error When a pulse faster than the digital filter
setting is input
Disconnection alarm error When a high-level signal is input to both of
the positive and negative differential line
receiver inputs
Count match Preset Count value = Comparison register 0
Count value = Comparison register 1
Zero clear Count value = Comparison register 0
Count value = Comparison register 1
*1 When the control input signal is used as a general-purpose input, hardware events cannot be set as above.
*2 When the control output signal is set for hardware events as above, it becomes a one-shot pulse output.
The pulse width is set by software to 10
µ sec, 100 µ sec, 1 msec, 10 msec, or 100 msec.
When the control output signal is used as a general-purpose output, it becomes a level output and hardware events
cannot be set as above. The output signal logic is set with the SW2 on this product. For setting the logic, see “Setting
the Logic of External Control Signals” in Chapter 2.