Number of External Scale Pitches
Setting
Range
Setting Unit Default Set-
ting
When Ena-
bled
Classifica-
tion
Pn20A 4 to
1,048,576
1 scale pitch/
revolution
32,768 After restart Setup
(applies to Position Control)
11.4.5 Setting the PAO, PBO, and PCO (Encoder Divided Pulse Output) Signals
Set the position resolution in Pn281 (Encoder Output Resolution).
Enter the number of phase A and phase B edges for the setting.
Specifications
n External encoder scale pitch: 20 μm
n Ball screw lead: 30 mm
n Speed:1,600 mm/s
If a single pulse (multiplied by 4) is output for 1 μm, the setting would be 20.
If a single pulse (multiplied by 4) is output for 0.5 μm, the setting would be 40.
The encoder divided pulse output would have the following waveform if the setting is 20.
Phase A
Phase B
Sine wave pitch
Fig. 337: Encoder Divided Pulse Output
“↑” indicates the edge positions. In this example, the set value is 20 and therefore the
number of edges is 20.
The upper limit of the encoder signal output frequency (multiplied by 4) is
6.4 Mpps (Million Pulses per Second). Do not set a value that would
cause the output to exceed 6.4 Mpps.
If the output exceeds the upper limit, an A.511 alarm (Overspeed of
Encoder Output Pulse Rate) will be output.
If the setting is 20 and the speed is 1,600 mm/s, the output frequency would be 1.6
Mpps
1600 mm/s
0.001 mm
= 1,600,000 = 1.6 Mpps
Fig. 338: Setting Example Formula - Encoder Divided Pulse Output
Because 1.6 Mpps is less than 6.4 Mpps, this setting can be used.
Example
Related Parameters
Setting Example
Sigma-7 Series SERVOPACKs
Fully-Closed Loop Control
Parameter and Object Settings for Fully-closed Loop Control > Setting the PAO, PBO, and PCO (Encoder Divided Pulse Output) Sig-
nals
| | PROFINET Communications - SIEP YEUOC7P 02A Revision 0 | en | 460
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