Installation; Installation Overview; Cable Length; Cable Specification - ABB Aztec 600 User Manual

Aztec 600
Colorimetric and ion-selective analyzers

2 Installation

2.1 Installation Overview

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.
Operational
Level
Ethernet TCP/IP
Master
Level
DP/PA
Slave
Link
Level
PROFIBUS PA
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 are connected in series.
Transmission Rate Maximum Segment
(bits/sec) Length (m)
9.6 to 93.75k
187.5k
500k
1.5M
3 to 12M
Table 2.1 Cable Length
IM/AZT6PBS–EN Rev. D
PROFIBUS DP
Aztec
600
Maximum Total
Network Length (m)
1200 4800
1000 4000
400 1600
200 800
100 400

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. In order
configuration for PROFIBUS,
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 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 (ABB_OAD4_1001.gsd) for PROFIBUS-enabled
Aztec 600 analyzers conforms to the PROFIBUS standard.
2 Installation
135 to 165
<30 pf/m
110/km
0.64mm
2
>0.34mm
to obtain 'Plug-and-Play'
characteristic device
3