ABB AnalyzeIT AX460 Handbuch - Seite 5
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2 INSTALLATION
2.1 Installation Overview – Fig. 2.1
All devices are connected in a bus structure ('line'). Up to 32
stations (master or slaves) can be linked to create one
'segment'.
Each end of a segment must be terminated by an active bus
terminating resistor. Both bus terminators must always be
powered to ensure fault-free operation therefore it is strongly
recommended that they are connected to a back-up power
supply.
Up to three line bus amplifiers (repeaters) can be used to extend
the network to a total of four segments, allowing a maximum of
125 devices to be installed in the system.
Fig. 2.1 Typical PROFIBUS Network
2.2 Cable Length
The maximum cable length of a segment is determined by the
transmission speed – see Table 2.1. The cable length specified
can be extended by using repeaters but it is recommended that
no more than three repeaters be connected in series.
T
a r
n
s
m
i
s s
o i
n
R
a
e t
M
a
i x
m
(
i b
s t
s /
e
) c
L
e
9
6 .
o t
9
3
7 .
5
K
1
8
7
5 .
K
5
0
0
K
1
5 .
M
3
o t
1
2
M
Table 2.1 Cable Length
u
m
S
e
g
m
e
t n
M
a
i x
m
u
m
T
n
g
h t
(
m
)
N
t e
w
o
k r
L
e
n
g
1
2
0
0
4
8
0
0
1
0
0
0
4
0
0
0
4
0
0
1
6
0
0
2
0
0
8
0
0
1
0
0
4
0
0
2.3 Cable Specification
The cable lengths in Table 2.1 refer to the following cable type:
Characteristic impedance
Capacitance per unit length
Loop resistance
Core diameter
Core cross section
Suitable PROFIBUS cable, Part Nos. PCA010, PCA 011 and
PCA 012, can be obtained from ABB. Refer to Data Sheet
10/63-6.46 EN.
2.4 Device Integration – the GSD File
PROFIBUS devices differ with respect to available functionality
and parameters and these vary individually for each device type
and
manufacturer.
configuration
communication features such as manufacturer name, device
name, hardware/software versions, baud rate and the number
and nature of inputs/outputs are defined in an electronic device
data sheet known as a GSD (Gerätestammdaten) file.
A GSD file is readable ASCII text file that contains both general
and device-specific specifications for communication. Each of the
entries describes a feature supported by a device. By the means
of keywords, a configuration tool reads the device identification,
the adjustable parameters, the corresponding data type and the
permitted limit values for the configuration of the device from the
GSD. Some keywords are mandatory, e.g. Vendor_Name; others
are optional, e.g. Sync_Mode_supported.
The GSD file for PROFIBUS-enabled AX400 Series analyzers
conforms to the PROFIBUS standard and provides a clear and
comprehensive description of each instrument in a precisely
defined format. This enables the system configuration tool to
use the information automatically when configuring a
PROFIBUS bus system.
The ABB GSD file is divided into 2 sections:
•
General Specifications
Identification of the device, together with hardware
and software versions, baud rates supported and the
possible time intervals for monitoring times.
•
DP Slave-Related Specifications
Modules containing output data information for each
t o
l a
PROFIBUS-enabled AX400 Series analyzer. The
h t
(
m
)
content of each module is defined by the amount of
data that can be obtained from each device. Module
01 contains those analyzers from which 10 bytes of
data are obtained, Module 02 contains those
analyzers from which 20 bytes of data are obtained
and Module 03 contains hose analyzers from which
24 bytes of data are obtained.
APPENDIX A lists all PROFIBUS-enabled AX400 Series
analyzers, grouped by Module.
135 to 165Ω
<30 pf/m
110Ω/km
0.64mm
>0.34mm
In
order
to
obtain
for
PROFIBUS,
characteristic
2
Plug-and-Play
device
3