Rotation Speed Measurement Mode - Mitsubishi Electric MELSEC-L02SCPU User Manual

8.6

Rotation Speed Measurement Mode

This section describes settings and functions that become valid when "Rotation Speed Measurement Mode" is
selected for "Operation Mode Setting". In this mode, the pulses input phase A and phase B pulse input signals are
counted, and the rotation speed is automatically calculated from the pulses. The measured rotation speed value is
written to the specified device using the Rotation speed measurement instruction (ICRCNT1) ( Page 253, Section
8.10.1 (8)). The following table shows I/O signals used in this mode.
Count source
1-phase
multiple of 1
(A phase only)
1-phase
multiple of 2
(A phase only)
1-phase
multiple of 1
A phase/B
1-phase
phase
multiple of 2
CW/CCW
2-phase
multiple of 1
2-phase
multiple of 2
2-phase
multiple of 4
*1 The signals can be used for other functions such as the general-purpose input except the interrupt input.
*2 The signals can be used for other functions such as the general-purpose input and output.
Note that the explanations in this section assume use of CH1. For the special register, and dedicated instructions for
CH2, refer to the following.
• Special register:  Page 240, Section 8.9 (2)
• Dedicated instructions:  Page 241, Section 8.10
226
Input signal
Phase A Phase B Phase Z
*1

*2



Function Latch counter
input signal input signal
*2 *2
 
: Wiring required, : Wiring not required
Output signal
Coincidence Coincidence
output No.1 signal output No.2 signal
*2

*2
