Instruction manual

6. DRIVE MODULE
6 − 25
6.2 Synchronous Encoder
The synchronous encoder is used to execute virtual axis operation by pulse inputs
from an external source.
Synchronous encoder operation and parameters are discussed below.
6.2.1 Synchronous encoder operation
(1) Operation START
A synchronous encoder axis START occurs when the reception of the pulse
inputs from the external synchronous encoder begins. Pulse input reception
occurs when switching from the REAL to the VIRTUAL mode is executed, and
when the external signal (TRA: synchronous encoder input START signal)
(Note-
2)
input occurs.
(a) Pulse input reception at REAL to VIRTUAL mode switching occurs as
follows
1) Reception of pulse inputs from the external synchronous encoder begins
from the point when REAL to VIRTUAL mode switching occurs.
REAL/VIRTUAL mode
switching request flag
(M2043)
REAL/VIRTUAL mode
status flag (M2044)
Pulse input from external
synchronous encoder
Feed current value (PULSE)
of synchronous encoder axis
Synchronous encoder axis operation START
VIRTUAL mode
(2
31
–1)
(–2
31
)
REAL mode
OFF
ON
ON
OFF
(Note-1)
(Note-1)
2) The clutch control mode
(Note-3)
operation will be identical to its operation
in the ON/OFF mode and the address mode
, and can be used with
incremental or absolute type synchronous encoders.
3) Transmission of synchronous encoder operation to the output module will
or will not occur depending on the ON/OFF status of the connected
clutch.
• When clutch is ON........ Transmission to the output module occurs.
• When clutch is OFF ...... Transmission to the output module does not
occur.
CAUTION
If the mode is switched from REAL mode to VIRTUAL mode while the clutch is ON, use the
smoothing clutch.
If the direct clutch is used and the mode is switched from REAL mode to VIRTUAL mode while
the clutch is ON, rapid acceleration will occur at the output module axis, causing a servo error,
and the machine will be subjected to a jolt.