26
büS/CANopen-Design
• Each gateway
can control up to 63 nodes (Control Heads Type 8681 büS/CANopen) if the network
topology considers the max. permitted cable length and the required power supply. Each node requires a
unique
“Node ID”,
otherwise an error occurs.
• The max. total line length
is 200 m for 125 kbit/s, 100 m for 250 kbit/s, 40 m for 500 kbit/s.
• The max. cable length for a single drop line
is 6 m,
the max. total length of all drop lines
in the
network is 100 m for 125 kbit/s, 55 m for 250 kbit/s, 30 m for 500 kbit/s.
• If the
voltage drop
is too large, an
additional power supply
can feed in at a CAN junction box (PWR
IN connection). In this case, connect
CAN ONLY to CAN IN
using a
CAN cable
.
This cable (which interconnects the CAN junction boxes at “CAN ONLY” and “CAN IN”) cannot be
used for T-connectors to branch “nodes” because no power is supplied to this cable (compare example
3 in chapter “8”).
• Unused or open connections
must be closed with the appropriate protective caps.
• Required
tightening torque
for all plug-in connections (cables, T-pieces, ...) to ensure the required
leak-tightness against moisture:
0.6 Nm + 0.1 Nm.
• The CAN cable must be
“terminated” at both ends:
connect a terminating resistor
(120 ohms)
to the
end of the CAN cable / T-connector or, if the line ends with a CAN junction box, connect the terminating
resistor to the CAN OUT connection.
• For service
work and also when reading out CAN data, a
PC with Bürkert Communicator Type 8920
can be connected to any free connection at the CAN junction box or to the CAN ONLY connection.
A büS stick
is necessary to connect the PC to the CAN network.
• T-connectors
can be used to connect single “nodes” or a PC to read out the CAN data (via Bürkert
Communicator).
6.3
Gateway
Icon
EDS file for
EtherNet/IP:
Gateway_EIP_8681_vxx_yymmdd_63Dev.eds
Icon:
icon_me43.ico
The Gateway Type ME43 is used as a fieldbus interface between the Control
Heads Type 8681 (büS) and the PLC (e.g. EtherNet/IP; Profinet on request).
Each gateway is designed to communicate with up to 63 control heads.
Fig. 3:
Gateway ME43 with connection terminals
6.4
Electrical connection options
or
With cable glands
or
with cable glands and multi-pole connection
(M12 plug according to IEC 61076-2-101, 5-pole)
Connection left: voltage, signals
Connection right: external initiator
(see also chapter “7 Accessories”)
Fig. 4:
Connection options
english
Type 8681 büS/CANopen
Содержание 8681
Страница 59: ...59 english Type 8681 büS CANopen ...
Страница 60: ...www burkert com ...
