Communication via PROFIBUS
Cyclic communication
4-118
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
Encoder 1 actual position value 1 (G1_XACT1)
S Resolution: encoder lines S 2
n
n: fine resolution, no. of bits for internal multiplication
The fine resolution is specified via p0418.
S Used to transmit the cyclic actual position value to the master.
S The transmitted value is a relative, free-running actual value.
S Any overflows must be evaluated by the master controller.
Bit 31
Encoder lines Fine information
11 10 0
Internal multiplication
p0418 for Gx_XACT1 (encoder 1 to 3)
Factory setting
Fig. 4-12 Partitioning and settings for Gx_XACT1
S Encoder lines of incremental encoder
– For encoders with sin/cos 1Vpp:
encoder lines = no. of sinusoidal signal periods
S After power up: Gx_XACT1 = 0
S An overflow in Gx_XACT1 must be trapped by the master controller.
S There is no modulo interpretation of Gx_XACT1 on the drive.
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