Mitsubishi Electric QD77MS User Manual page 67

[3] Synchronous encoder via CPU (Synchronous encoder via PLC CPU)
Setting method
Used to operate a gray code encoder that is connected to the input module of the PLC
CPU as a synchronous encoder axis.
By setting "201: Synchronous encoder via CPU" in "[Pr.320] Synchronous encoder axis
type", the synchronous encoder is controlled by the encoder value which is the input value
of "[Cd.325] Input value for synchronous encoder via CPU".
The encoder value can be used as a cycle counter within the range from 0 to (Resolution
of synchronous encoder via CPU - 1).
Connection is invalid just after the system's power supply is ON. When "1" is set in
"[Cd.324] Connection command of synchronous encoder via CPU", the synchronous
encoder axis current value and the synchronous encoder axis current value per cycle are
restored based on "[Cd.325] Input value for synchronous encoder via CPU". Therefore,
connection becomes valid, and will be on the counter enabling status.
The synchronous encoder axis is controlled based on the amount of change of "[Cd.325]
Input value for synchronous encoder via CPU" while it is connecting.
Setting example
The following shows an example for setting a synchronous encoder via CPU as
synchronous encoder axis 4 of the QD77MS.
(Resolution of the gray code encoder: 4096 PLS/rev)
Input
QD77MS module
Set "201: Synchronous encoder via CPU" in "[Pr.320] Synchronous encoder axis type" of
synchronous encoder axis 4.
Set "4096" in "[Pr.329] Resolution of synchronous encoder via CPU" of synchronous
encoder axis 4.
Read the encoder value of the gray code encoder with a program, and update "[Cd.325]
Input value for synchronous encoder via CPU" of the synchronous encoder axis 4 at every
time.
Axis 1 Axis 2
2 - 19
Chapter 2 Input Axis Module
Synchronous encoder axis 4
Axis 3
Gray code encoder