Common Settings - Mitsubishi Electric MELSEC-L02SCPU User Manual

8.3.1

Common settings

This section describes settings common to some operation modes.
(1) Operation mode setting
According to the application, select an operation mode from the following five modes. The setting items depend
on the selected operation mode. For required settings and available functions for each operation mode, refer to
the following table.
Operation mode
Normal mode In this mode, the CPU module operate as a general high-speed counter.
Frequency measurement The frequencies of pulses input to the pulse input signals of phases A and B are
mode measured.
Rotation speed A rotation speed is calculated from the number of pulses input to the pulse input
measurement mode signals of phases A and B.
Pulse measurement
The on or off width of pulses input to Function input signal is measured.
mode
PWM output mode PWM waveforms are output from Coincidence output No.1 signal.
(2) Count source selection
Select a count source from the following.
Count source
Counts pulses input to the pulse input signals of phases A and B of an
A Phase/B Phase external I/O connector. Select a pulse count method in "Pulse Input
Mode".
Internal Clock (0.1s)
Internal Clock (1s)
Counts pulses generated at the inside of a LCPU in the specified cycle.
Internal Clock (10s)
Internal Clock (100s)
Counts pulses at the timing according to the operation mode set to other
channels.
Other CH Coincidence • Normal mode: On the rising edge of CH2 Counter value coincidence
Output No.1
• PWM output mode: On the rising edge of Coincidence output No.1
Description
(No.1) (SM1901) (when the own channel is CH1)
signal
CHAPTER 8 HIGH-SPEED COUNTER FUNCTION
Description Reference
Page 198, Section 8.4
Page 220, Section 8.5
Page 226, Section 8.6
Page 232, Section 8.7
Page 235, Section 8.8
Operation mode where the
setting can be used
Normal mode
Frequency measurement mode
Rotation speed measurement
mode
Normal mode
Own channel: Normal mode
Other channels: Normal mode or
PWM output mode
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