Omron C200HW-CORT21, Operation Manual

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Network cabling
Section 2-3
28
Termination
ISO 11898
The bus must be terminated on both ends of the line. The cables,
connectors, and termination resistors used in CAN networks must meet the
requirements defined in ISO 11898.
The following tables list the electrical characteristics of a CAN cable and of
the terminator according ISO 11898.
Value Cable Parameters
Minimum Nominal Maximum
Impedance [
Ω
]
108 120 132
Length-related resistance [m
Ω
/m]
70
Specific line delay [ns/m] 5
Value Terminator Parameter
Minimum Nominal Maximum
Resistance [
Ω
]
118 120 130
Cable length The maximum length of the cable depends on the transmission speed, see
table below.
Baud rate (kbit/s) Network length (m)
10 5000 *
20 2500 *
50 1000 *
125 500
250 250
500 100
800 50
1000 25
* For bus lengths greater than about 1 km, a
bridge or repeater device is recommended.
The market offers cables with not only the two data signal lines, but also the
three other signal lines (CAN_GND, CAN_SHLD, CAN_V+). This enables to
connect the network power supply and shield at a central location of the CAN
network.