Siemens 6ES7 972-4AA02-0XA0 User Manual page 49

User´s Guide Power Rail Booster Version 12/2005
particles and rubs off oxide layers. The greater the frequency of travel over a contact
rail and the greater the pressure of the sliding contact against the rail, the greater the
self-cleaning effect.
SF
Group error
Slave
A slave may exchange data with a master only at the master´s request. Slaves are
e.g. all DP slaves, such as ET 200L, ET 200X, ET 200M, ET 200S etc.
Sliding Contact
Mobile component of a contact rail system.
Tbit
Bit duration, length of a bit
To ground
To ground means to connect an electrically conductive component with the
grounding electrode via a grounding system.
Transfer Resistance
Electrical resistance between a contact rail and a sliding contact during travel. The
transfer resistance depends on the amount of contamination on sliding contact and
contact rail, as well as on the oxidation of both their surfaces.
Zero Potential
Zero potential is seen as the entirety of all interconnected inactive electrical parts of a
device which cannot assume a dangerous level of touch voltage even in the event of
a fault.
Copyright © Siemens AG 2005 All rights reserved.
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