B&R 2100, Руководство пользователя

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Technical data • Individual components
Chapter 2
Technical data
Panel PC 2100 swing arm user's manual V1.12 95
CAN driver settings
The baud rate can be set in Automation Studio either with predefined values or with the bit timing register. For
additional information, see Automation Help.
Bit timing register 1 Bit timing register 0 Baud rate
00h 14h 1000 kbit/s
80h or 00h 1Ch 500 kbit/s
81h or 01h 1Ch 250 kbit/s
83h or 03h 1Ch 125 kbit/s
84h or 04h 1Ch 100 kbit/s
89h or 09h 1Ch 50 kbit/s
Table 87: CAN driver settings
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 Transfer rate
≤1000 m Typ. 50 kbit/s
≤200 m Typ. 250 kbit/s
≤100 m Typ. 500 kbit/s
<20 m
1)
Typ. 1 Mbit/s
Table 88: CAN - Bus length and transfer rate
1) The specified cable length is only valid with the values specified in Tab. 66 "CAN driver settings" . Cable lengths additionally depend on the values in the
timing register.
The material used for the cable should have all or most of the following properties in order to achieve an optimal
transfer rate.
CAN cable Property
Signal lines
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
2x 0.25 mm² (24 AWG / 19), tinned copper stranded wire
PE
≤82 Ω/ km
Wires stranded in pairs
Paired shield with aluminum foil
Grounding line
Cable cross section
Wire insulation
Conductor resistance
1x 0.34 mm² (22 AWG / 19), tinned copper stranded wire
PE
≤59 Ω/km
Outer sheathing
Material
Features
Complete shielding
PUR mixture
Halogen-free
From tinned copper wires
Table 89: CAN cable requirements
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 enabled or disabled.
Terminating resistor
On The terminating resistor is enabled.
Off The terminating resistor is disabled.
Table 90: Terminating resistor
3.4.2.3.5 Shielding
For the interfaces on the 10-pin female connector, the interface shield can be put on pin 2 of the female connector.
A functional ground connection, which can also be used for the cable shields, is located on the interface plate of
the system unit.