5.9 Absolute Encoders
5-69
5.9.5 Absolute Data Reception Sequence
The sequence in which the multi-winding drive unit receives the output from the absolute encoder and trans-
mits it to host controller is shown below.
(1) Outline of Absolute Data
The serial data, pulses, etc., of the absolute encoder that are output from the multi-winding drive unit are out-
put from the PAO, PBO, and PCO signals as shown below.
Phase-C Output Specifications
The pulse width of phase C (origin pulse) changes depending on the encoder output pulse (Pn212), becoming
the same width as phase A.
The output timing is one of the following.
• Synchronized with the rising edge of phase A
• Synchronized with the falling edge of phase A
• Synchronized with the rising edge of phase B
• Synchronized with the falling edge of phase B
Note: When host controller receives the data of absolute encoder, do not perform counter reset using the output of PCO
signal.
(2) Absolute Data Reception Sequence
1. Set the SEN signal at ON (high level).
2. After 100 ms, the system is set to rotational serial data reception standby and the incremental pulse up/
down counter is cleared to zero.
3. Eight characters of rotational serial data is received.
4. The system enters a normal incremental operation state about 400 ms after the last rotational serial data is
received.
Note: The output pulses are phase-B advanced if the servomotor is turning forward regardless of the setting in Pn000.0.
Signal Name Status Contents
PAO
At initialization
Rotational serial data
Initial incremental pulses
Normal Operations Incremental pulses
PBO
At initialization Initial incremental pulses
Normal Operations Incremental pulses
PCO Always Origin pulses
ENC
CN1
SEN
PAO
PBO
PCO
CN21
Serial
data
Serial data→
pulse conversion
Host
controller
Multi-winding drive unit
Dividing
circuit
(Pn212)
PAO
PBO
SEN signal
Incremental pulses
Incremental pulses
Undefined
Undefined
(Phase A)
(Phase A)
(Phase B)
(Phase B)
Rotational
serial data
400 ms max.
50 ms
1 to 3 ms
Approx. 15 ms
90 ms typ.
60 ms min.
Initial
incremental
pulses
Initial
incremental
pulses
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