50 FEP630, FEH630 ELECTROMAGNETIC FLOWMETER | OI/FEP630/FEH630-EN REV. D
… 6 Electrical connections
… Digital communication
120 Ω
120 Ω
D
R
D
R
D
R
A
B
GND
G11603
1
2
3
4
2
1 Modbus master
2 Terminating resistor
3 Modbus slave 1
4 Modbus slave n to 32
Figure 65: Communication with the Modbus protocol
Cable specification
The maximum permissible length is dependent on the baud rate,
the cable (diameter, capacity and surge impedance), the number
of loads in the device chain, and the network configuration
(2-core or 4-core).
• At a baud rate of 9600 and with a conductor cross-section of
at least 0.14 mm
2
(AWG 26), the maximum length is 1000 m
(3280 ft).
• When using a 4-core cable as a 2-wire wiring system, the
maximum length must be halved.
• The spur lines must be short, a maximum of 20 m (66 ft).
• When using a distributor with ‘n’ connections, each branch
must have a maximum length of 40 m (131 ft) divided by ‘n.’
The maximum cable length depends on the type of cable used.
The following standard values apply:
• Up to 6 m (20 ft):
cable with standard shielding or twisted-pair cable.
• Up to 300 m (984 ft):
double twisted-pair cable with overall foil shielding and
integrated earth cable.
• Up to 1200 m (3937 ft):
double twisted-pair cable with individual foil shielding and
integrated earth cables. Example: Belden 9729 or equivalent
cable.
A category 5 cable can be used for Modbus RS485 up to a
maximum length of 600 m (1968 ft). For the symmetrical pairs in
RS485 systems, a surge impedance of more than 100 Ω is
preferred, especially at a baud rate of 19200 and above.
PROFIBUS DP® communication
Note
The PROFIBUS DP protocol are not secure, as such the intended
application should be assessed to ensure that these protocols
are suitable before implementation
PROFIBUS DP interface
Terminals V1 / V2
Configuration Via the PROFIBUS DP interface or via the local
operating interface in connection with Asset Vision
Basic (DAT200) and a corresponding Device Type
Manager (DTM)
Transmission In accordance with IEC 61158-2
Baud rate 9.6 kbps, 19.2 kbps, 45.45 kbps, 93.75 kbps, 187.5
kbps, 500 kbps, 1.5 Mbps
The baud rate is automatically detected and does not
need to be configured manually
Device profile PA Profile 3.02
Bus address Address range 0 to 126
Factory setting: 126
For commissioning purposes, you will need a device driver in
EDD (Electronic Device Description) or DTM (Device Type
Manager) format plus a GSD file.
You can download EDD, DTM and GSD from www.abb.com/flow.
The files required for operation can also be downloaded from
www.profibus.com.
ABB provides three different GSD files which can be integrated in
the system.
ID number GSD file name
0x9740 PA139740.gsd 1xAI, 1xTOT
0x9700 PA139700.gsd 1AI
0x3432 ABB_3432.gsd 6xAI, 2xTOT,
1xAO, 1xDI, 1xDO
Users decide at system integration whether to install the full
range of functions or only part. Switching is made using the
‘Ident Nr. Selector’ parameter.
See also Ident Nr. Selector on page 96.
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