Cables For Ssi And Incremental Encoders; Analog Inputs - Siemens SIMATIC FM 458-1 DP User Manual

2.2.6

Cables for SSI and incremental encoders

2.2.7

Analog inputs

NOTE
Application Module FM 458-1 DP - User Manual
A5E01078222-02 Edition 03.2009
SIEMENS AG has pre-assembled cables to connect encoders to
the EXM 438-1. More detailed information is provided in the Catalog
"Connection Systems & System Modules for SINUMERIK, SIMODRIVE,
SIMOVERT MASTERDRIVES & SIMOTION, Catalog NC Z" in its current
version at a time
The EXM 438-1 has been designed so that analog inputs can be very
quickly read-in and with a high associated precision. This is the reason
that the analog inputs do not have any hardware smoothing. This
means that noise spikes are present on the signals at the analog inputs
at the sampling instant. These are detected by the AD converter and
output at the analog input block ADC.
As counter-measure, software smoothing can be provided at output Y
of the ADCs. This is realized using the PT1 block which then
suppresses noise and disturbances. The smoothing time constant is
dependent on the sampling time that is configured in the PT1 block.
Product description
2-27