Siemens SIMATIC FM 453, Manual

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9-62
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
Table 9-9 shows you how to adapt the selected encoder to the
FM 453.
Table 9-9 Function Parameters – Incremental Encoders
MD Designation Value/Meaning Comments/Unit
10 Encoder type 1 = Incremental encoder (Code number)
11 Displacement per
encoder revolu-
tion (division pe-
riod) 1...1 000 000 000
see Section 5.3.1, Dependencies (MSR)
(integer portion)
12 Residual distance
per encoder revo-
lution (division
period) 0...2
32
–1
see Section 5.3.1, Dependencies
(2
–32
MSR)
(fractional portion)
13 Increments per
encoder revolu-
tion (division pe-
riod) 2
1
...2
25
see Section 5.3.1, Dependencies
Entry according to
encoder rating plate
19.0 Direction adjust-
ment 1 = invert measured value direc-
tion
20
20.0
20.2
20.3
Hardware moni-
toring
1 = Cable break
1 = Pulse monitoring
1 = Voltage monitoring
Entry for monitoring
to be switched on
MSR stands for measurement system raster (see Section 5.3.1)
Encoder: Number of increments per revolution (MD13) = 2,500
(The FM 453 works by the principle of quadruple evaluation. This yields an
FM-internal number of increments per revolution = 10,000.)
Machine design:
S
Motor with 50:30 gear ratio on spindle with 10 mm pitch = 10,000 MSR
S
Encoder on motor.
From this one can calculate the following traversing distance per encoder
revolution:
Displacement per encoder revolution =
50 spindle revolutions
30 motor revolutions
i 10,000 MSR = 16,666.666... MSR
Gear ratio: i =
= 1.666666...
The following values are entered:
MD Value Unit
11 16 666 (10
–3
mm)
12 0.666... 2
32
= 2,863,311,530 (2
–32
10
–3
mm)
13 2 500 (pulse/rev)
Function
Parameters
Sample Encoder
Adjustment
Description of Functions