B&R Panel PC 2100 User Manual page 169

CAN driver settings
The baud rate can be set either with predefined values or the bit timing register. For additional information, see
Automation Help.
Bit timing register 1
00h
80h or 00h
81h or 01h
83h or 03h
84h or 04h
89h or 09h
CAN - Bus length and cable type
The type of cable to be used depends largely on the required bus length and number of nodes. The bus length is
determined by the bit rate. In accordance with CiA (CAN in Automation), the maximum bus length is 1000 meters.
The following bus lengths are permitted with a maximum oscillator tolerance of 0.121%:
Extension
≤1000 m
≤200 m
≤100 m
<20 m
1)
1) The specified cable length is only valid with the values specified in
timing register.
The material used for the cable should have all of the following properties or deviate from them as little as possible
to achieve an optimal transfer rate.
CAN cable
Signal lines
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
Ground line
Cable cross section
Wire insulation
Conductor resistance
Outer jacket
Material
Properties
Complete shielding
Terminating resistor
A terminating resistor is integrated in the interface option above the ETH1 interface. A switch is used to enable
or disable the terminating resistor for the CAN bus interface. The L1 LED status indicator indicates whether the
terminating resistor is switched on or off.
On The terminating resistor is switched on.
Off The terminating resistor is switched off.
2.3.5.2.3.5 Shielding
For the interfaces on the 10-pin female connector, the interface shield can be put on pin 2 of the female connector.
Panel PC 2100 user's manual V1.17
Bit timing register 0
14h
1Ch
1Ch
1Ch
1Ch
1Ch
Table 137: CAN driver settings
Table 138: CAN - Bus length and transfer rate
Tab. 137 "CAN driver
2x 0.25 mm² (24 AWG / 19), tinned copper stranded wire
1x 0.34 mm² (22 AWG / 19), tinned copper stranded wire
Table 139: CAN cable requirements
Terminating resistor
Table 140: Terminating resistor
Transfer rate
Typ. 50 kbit/s
Typ. 250 kbit/s
Typ. 500 kbit/s
Typ. 1 Mbit/s
settings". Cable lengths additionally depend on the values in the
Property
PE
≤82 Ω/km
Wires stranded in pairs
Paired shield with aluminum foil
PE
≤59 Ω/km
PUR compound
Halogen-free
Composed of tinned copper wires
Terminating resistor
On
Technical data
Baud rate
1000 kbit/s
500 kbit/s
250 kbit/s
125 kbit/s
100 kbit/s
50 kbit/s
Off
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