Chapter 4
Operation
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4.4 Absolute Encoders
The absolute position can be read by the MODBUS protocol. In the actual control, the MODBUS protocol
can read the initial position when the servomotor is stopped (S-OFF), then the real-time position during
the servomotor is running can be learnt from the number of PG divided output pulses.
4.4.1 Selecting an Absolute Encoder
An absolute encoder can also be used as an incremental encoder.
Absolute
Absolute
Absolute
Absolute
Encoder
Encoder
Encoder
Encoder Type
Type
Type
Type
Resolution
Resolution
Resolution
Resolution
Output
Output
Output
Output Range
Range
Range
Range of
of
of
of
Multiturn
Multiturn
Multiturn
Multiturn Data
Data
Data
Data
Action
Action
Action
Action when
when
when
when limit
limit
limit
limit is
is
is
is exceeded
exceeded
exceeded
exceeded
ProNet Series
16-bit/multiturn
17-bit/singleturn
-32768
～
+32767
·When the upper limit(+32767)is exceeded
in the forward direction, the multiturn data is
-32768
·When the lower limit(-32768)is exceeded
in the reverse direction, the multiturn data is
+32767.
Parameter
Parameter
Parameter
Parameter
Meaning
Meaning
Meaning
Meaning
Pn002
b.□0□□
Use the absolute encoder as an absolute encoder.(Factory setting)
b.□1□□
Use the absolute encoder as an incremental encoder.
·The back-up battery are not required when using the absolute encoder as an incremental
encoder.
·After changing these parameters, turn OFF the main circuit and control power supplies and
then turn them ON again to enable the new settings.
