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6.8 CAN bus interface (IF7)
With the exception of the entry level CPU, all compact CPUs are equipped with a non-electrically isolated CAN
bus interface. It is located on the X1 I/O slot.
6.8.1 Pinout
6.8.2 Terminating resistor
Integrated I/O slot
A terminating resistor is already installed on the X1 I/O slot. It can be turned on and off with a switch on top of the
housing. An active terminating resistor is indicated by the "T" LED.
6.9 Slot for interface modules
These CPUs are equipped with one slot for interface modules.
Various bus and network systems can easily be integrated into the X20 system by selecting the corresponding
interface module.
Data sheet V1.21
CAN high
CAN low
Figure 3: CAN bus interface (IF7) on the X1 I/O slot - Pinout
X1
X2
X3
Figure 4: Switch positions for the CAN bus terminating resistor
X20(c)CP1301, X20CP1381 and X20CP1382
E
R
RF
F
S
E
ET
PL
A1
A2
1
2
3
4
C
S
T
DC
GND
Terminating resistor switch
On
Off
17
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