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4.2.7.2 Termination Resistors
Attention
The bus cable must be terminated with a resistor (121 Ω / ±1% / ¼ W). The
resistor is contacted with CAN_H and CAN_L.
Should problems occur during commissioning, your first step should be to
measure the resistance between CAN_L and CAN_H.
• If the result is approx. 60 Ω, both termination resistors are present.
• If the measuring result is considerably below 60 Ω, more than 2 termina-
• If the measuring result considerably exceeds 60 Ω, only one or no termina-
4.2.7.3 Bus Voltage Level
The bus voltage level are measured at a recessive state between
• CAN_L and CAN_H :
• GND and CAN_L
• GND and CAN_H
The bus voltage level are measured at a dominant state between
• CAN_L and CAN_H :
• GND and CAN_L
• GND and CAN_H
Fieldbus Dependent I/O Module
CANopen
tion resistors are present.
tion resistor is present.
approx. 0 V
:
approx. 2,5 V
:
approx. 2,5 V
approx. 1 V
:
approx. 1,5 V
:
approx. 3,5 V
Installation
• 23
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