If you will use a Linear Servomotor, set the encoder output resolution (Pn281).
Encoder Output Resolution
Setting
Range
Setting Unit Default Set-
ting
When Ena-
bled
Classifica-
tion
Pn281 1 to 4,096 1 edge/pitch 20 After restart Setup
(applies to Speed Control, Position Control and Force Control)
The maximum setting for the encoder output resolution is 4,096. Pulse
output at a linear encoder resolution of 4,096 or higher is not possible.
Set the encoder output resolution for the encoder pulse output signals (PAO, /PAO, PBO,
and /PBO) from the SERVOPACK to the host controller.
The number of feedback pulses per linear encoder pitch is divided by the setting of
Pn281 (after multiplication by 4) inside the SERVOPACK and then the resulting number
of pulses is output. Set the parameter according to the system specifications of the
machine or host controller.
The setting range depends on the Servomotor’s maximum speed (Pn385) and the linear
scale pitch (Pn282).* You can calculate the upper limit of the setting of Pn281 with the
following formula.
´ 72
Upper limit of Pn281 =
Linear Encoder Pitch*/100
Pn385
Fig. 163: Upper limit of the setting of Pn281 - Formula
* The value depends on whether a Serial Converter Unit is used.
Using a Serial Converter Unit Setting of Pn282
Not Using a Serial Converter Unit (when
the linear encoder and SERVOPACK are
connected directly or when a linear
encoder that does not require a Serial
Converter Unit is used)
The linear encoder pitch is automatically
detected by the SERVOPACK, so the set-
ting of Pn282 is ignored. You can use the
monitor functions of the SigmaWin+ to
check the linear encoder pitch that was
automatically detected.
When the linear encoder pitch is 4 μm, the maximum motor speed is
limited to 1 mm/s because of the maximum response frequency of the
Serial Converter Unit.
If the setting is out of range or does not satisfy the setting conditions, an
A.041 alarm (Encoder Output Pulse Setting Error) will be output. If the
motor speed exceeds the upper limit for the set encoder output resolu-
tion, an A.511 alarm (Encoder Output Pulse Overspeed) will be output.
The upper limit of the encoder output resolution is restricted by the
dividing specifications of the Serial Converter Unit.
Correct setting for a linear encoder pitch of 20 μm and a maximum motor speed of 5 m/s
(Pn385 = 50): Pn281 = 28 (edges/pitch)
Incorrect setting: Pn281 = 29 (edges/pitch) (An A.041 alarm would be output.)
Setting Example
Encoder Divided Pulse
Output When Using a
Linear Servomotor
Sigma-7 Series SERVOPACKs
Application Functions
Encoder Divided Pulse Output > Setting for the Encoder Divided Pulse Output
| | PROFINET Communications - SIEP YEUOC7P 02A Revision 0 | en | 220
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