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Input / Output 5-23
MN1943
H
The maximum bus length depends on the bit-timing
configuration (baud rate). The table opposite shows
the approximate maximum bus length (worst-case),
assuming 5ns/m propagation delay and a total
effective device internal in-out delay of 210 ns at 1
Mbit/s, 300 ns at 500 - 250 Kbit/s, 450 ns at 125 Kbit/s
and 1.5 ms at 50 - 10Kbit/s.
(1)
For bus lengths greater than about 1000 m,
bridge or repeater devices may be needed.
H
The compromise between bus length and CAN baud
rate must be determined for each application. The
CAN baud rate can be set using the
BUSBAUD
keyword. It is essential that all nodes on the
network are configured to run at the same baud rate.
H
The wiring topology of a CAN network should be as close as possible to a single line/bus
structure. However, stub lines are allowed provided they are kept to a minimum (<0.3 m at
1 Mbit/s).
H
The 0 V connection of all of the nodes on the network must be tied together through the CAN
cabling. This ensures that the CAN signal levels transmitted by MotiFlex
e
100 or CAN
peripheral devices are within the common mode range of the receiver circuitry of other nodes
on the network.
5.7.2.1 Opto-isolation
On the MotiFlex
e
100, the CAN channel is opto-isolated. A voltage in the range 12-24 VDC must
be applied between pin 9 (+24 V) and pin 3 or 6 (0 V) of the CAN connector. From this supply, an
internal voltage regulator provides the 5 V at 100 mA required for the isolated CAN circuit. To
allow easy connection of the 12-24 VDC supply, Baldor adaptor part OPT-CNV002 can be used,
allowing connection by ordinary CAT 5e Ethernet cables. The adaptor also provides flying lead
connections for the application of the CAN power supply.
Figure 63 - OPT-CNV002
Alternatively, a connector such as the Phoenix Contact SUBCON-PLUS F3 (part 2761871)
provides a 9-pin D-type female connector with easily accessible terminal block connections (see
Figure 64).
CAN cables supplied by Baldor are ‘category 5’ and have a maximum current rating of 1 A, so the
maximum number of MotiFlex
e
100 units that may be used on one network is limited to 10.
CAN
Maximum
Baud Rate
Bus Length
1 Mbit/s
25 m
500 Kbit/s
100 m
250 Kbit/s
250 m
125 Kbit/s
500 m
100 Kbit/s
600 m
50 Kbit/s
1000 m
20 Kbit/s
2500 m
(1)
10 Kbit/s
5000 m
(1)
Summary of Contents for MotiFlex e100
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Page 60: ...www baldormotion com 3 44 Basic Installation MN1943 ...
Page 102: ...www baldormotion com 5 28 Input Output MN1943 ...
Page 136: ...www baldormotion com 7 8 Troubleshooting MN1943 ...
Page 172: ...www baldormotion com 8 36 Specifications MN1943 ...
Page 188: ...www baldormotion com B 6 Control System MN1943 ...
Page 204: ...www baldormotion com C 16 Mint Keyword Summary MN1943 ...
Page 216: ...Index MN1943 ...
Page 218: ...www baldormotion com Comments MN1943 Thank you for taking the time to help us ...
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