Technical data
164
Panel PC 2200 built-in devices User's manual V 1.05 Translation of the original documentation
CAN driver settings
The baud rate can be set either with predefined values or via 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 140: 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 transfer rate. According to CAN in Automation (CiA), the maximum bus length is 1000 meters.
The following bus lengths are permitted at a maximum permissible 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 141: CAN - Bus length and transfer rate
1)
The specified cable length is only valid with the values specified in
Tab. 139 "CAN driver settings"
. Otherwise, the cable lengths depend on the values in
the timing register.
Preferably, the cable material used should have the following properties or deviate only slightly from them in order
to achieve an optimal transfer rate.
CAN cable
Property
Signal line
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
2x 0.25 mm² (24AWG/19), tinned copper stranded wire
PE
≤82 Ω/km
Wires stranded in pairs
Pair shielding with aluminum foil
Ground conductor
Cable cross section
Wire insulation
Conductor resistance
1x 0.34 mm² (22AWG/19), tinned copper stranded wire
PE
≤59 Ω/km
Outer jacket
Material
Properties
Cable shield
PUR compound
Halogen-free
Composed of tinned copper wires
Table 142: CAN cable requirements
Terminating resistor
A terminating resistor is integrated on the interface option. It is located near the ETH1 interface. A switch is used
to switch the terminating resistor for the CAN bus interface on and off. LED status indicator "L1" indicates whether
the terminating resistor is switched on or off.
Terminating resistor
On
The terminating resistor is switched on.
Off
The terminating resistor is switched off.
Terminating resistor
Table 143: Terminating resistor
