Weidmuller SAI Active Universal Pro Series, Руководство пользователя

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Appendix
CSMA/CA
Carrier Sense Multiple Access / Collision Avoid-
ance.
DATA A
Data from PROFIBUS is transmitted via a two-core,
shielded twisted-pair cable with RS485 (transmis-
sion of differential signal). The strands are desig-
nated as DATA A (green strand) and DATA B (red
strand).
DATA B
Data from PROFIBUS is transmitted via a two-core,
shielded twisted-pair cable with RS485 physic
(transmission of differential signal). The strands are
designated as DATA A (green strand) and DATA B
(red strand).
DBT
COB-ID Distributor. A service element of the appli-
cation layer which is responsible for the assignment
of the COB IDs to the relevant communication ob-
ject of the CMS service.
DESINA
Please see Diagnostics input DESINA.
DI
Please see Digital input.
Diagnostic telegrams
Diagnostic telegrams indicate the status of the
PROFIBUS-DP slave. A diagnostic telegram is
composed of six bytes of standard diagnostics in-
formation as well as the vendor diagnostics informa-
tion. The number of bytes required for the manufac-
turer’s diagnostics varies from module to module.
Diagnostics data
Diagnostics data is transmitted in a diagnostics
telegram. This information is differentiated between
standard diagnostics information (6 bytes) and ven-
dor diagnostics information, the length of which de-
pends on the vendor.
Diagnostics input DESINA
DESINA stands for the DEcentralised and Stan-
dardised INstAllations technology for machine tools
and production systems. DESINA describes the
specification for standardising the electric, hydraulic
and pneumatic installation of automated machine
tools and manufacturing systems. DESINA diagnos-
tics input supplies diagnostic information in addition
to the digital input signal.
See also http://www.desina.de .
DIN
German Institute for Standardization.
DO
Please see Digital output.
DP
Please see PROFIBUS-DP.
EDS file
An EDS file (Electronic Data Sheet) is a text file
containing the properties of a CANopen device.
EMC
Electro-Magnetic Compatibility indicates the distur-
bance degree of a device in relationship to its sur-
roundings.
FE
See Functional Earth.
Field devices
Field devices is a term used to describe all of the
devices operating on a Fieldbus. Field devices can
be input and output modules (SAIs) as well as
drives, controls and human-machine interfaces.
Frequency converter
A frequency converter generates an alternating cur-
rent of a certain frequency from an alternating cur-
rent of a different frequency and may also alter the
voltage. It makes it possible to adjust rotational
speeds. In particular for three-phase motors, fre-
quency converters are an economic form of control.
Functional earth
The functional earth serves to discharge compen-
sating and interference currents in order to guaran-
tee EMC characteristics. According to VDE 0100,
the functional earth is not the same as the protec-
tive earth; it is forbidden to use it as the protective
earth.
Hardware configuration
All devices and parameters of a control system are
defined in a hardware configuration.
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