Siemens SIMOTICS S-1FL6 - Page 76

Getting Started
76 A5E36037886-003, 04/2017
Benefits of electronic gear (example):
Move the workpiece for 10 mm:
Without electronic gear
With electronic gear
Required number of setpoint pulses:
2500 ppr × 4 × (10 mm/6 mm) = 16666
Required number of setpoint pulses:
(10 mm × 1000) / 1 LU = 10000
The electronic gear ratio is a multiplier factor to pulse train setpoint. It is realized with a numerator and a denominator. Four
numerators (p29012[0], p29012[1], p29012[2]. p29012[3]) and one denominator (p29013) are used for the four electronic
gear ratios:
Parameter
Range
Factory setting
Unit
Description
p29012[0]
1 to 10000
1
-
The first numerator of electronic gear
p29012[1]
1 to 10000
1
-
The second numerator of electronic gear
p29012[2]
1 to 10000
1
-
The third numerator of electronic gear
p29012[3]
1 to 10000
1
-
The forth numerator of electronic gear
p29013
1 to 10000
1
-
The denominator of electronic gear
These four electronic gear ratios can be selected with the combination of the digital input signals EGEAR1 and EGEAR2:
EGEAR2 : EGEAR1
Electronic gear ratio
Ratio value
0 : 0
Electronic gear ratio 1
p29012[0] : p29013
0 : 1
Electronic gear ratio 2
p29012[1] : p29013
1 : 0
Electronic gear ratio 3
p29012[2] : p29013
1 : 1
Electronic gear ratio 4
p29012[3] : p29013
Note
After a gear ratio is switched to another one via digital inpu
ts, you need to wait five seconds and then perform
SERVO ON
.
Note
The range of electronic gear ratio is from 0.02 to 500.
The electronic gear ratio can be set at SERVO OFF
state only. After the setting, you need to reference the drive again.
Examples for calculating the electronic gear ratio
Step
Description
Mechanism
Ball screw
Disc table
1 Identify mechanism
• Pitch of ball screw: 6 mm
•
Deduction gear ratio: 1:1
• Rotary angle: 360
o
•
Deduction gear ratio: 1:3
2 Identify encoder resolu-
tion
10000 10000