Festo CPS-Gate, Operating Instructions Manual

Page: 58 / 109

CPS Gate
58
© Festo Didactic 8075265
11.3.2 CAN interface
This interface is implemented by means of an 8-
pin RJ45 plug. It’s electrically isolated from the device’s
supply voltage.
CAN, -X2 Pin Assignment
1
2
3
4
5
6
7
8
Shld
CAN-H
CAN-L
GND (signal ground for CAN) HF coupling to FE (1 M
Ω
|| 22 nF)
NC
NC
NC
NC
NC
Shield, HF coupling to FE (1 M
Ω
|| 22 nF)
Notes
– Unconnected pins 4 … 8 may not be used by the r emote partner.
– Based on the overall bus structure, check to determine whether or not an
external terminating resistor is required. As a rule, these terminating resistors
are located at the beginning and the end of the bus cable.
Resistance is typically 120
Ω
.
– Use a twisted 2-wire cable with shield for the CANopen bus.
Note
Faulty installation and high transmission rates may cause data transmission errors as
a result of signal reflections and signal attenuation. Transmission errors can be
caused by:
– Missing terminating resistor between CAN_L (pin 2) and CAN_H (pin 1)
– Faulty shield connection
– Branches
– Large distances
– Unsuitable cables