21
URB 60 - Installation & Operating Manual -
819699-00
Example
Connecting the CAN bus system
URB
URS, NRR, LRR,
URW
NRG, LRG, TRV
NRG, LRG,TRV
CH = CAN High
CL = CAN Low
S = shield
Terminating
resistor
5
Shield
3
3
5
5
120
Ω
CH
CL
120 Ω
CH
CL
S
+ 24 V
- 0 V
CH
CL
S
CL
-
CH
+ 24 V
S
+ 24 V
- 0 V
CH
CL
S
+ 24 V
- 0 V
CH
CL
S
+ 24 V
- 0 V
CH
CL
S
CH
CH
CH
CH
CL
CL
CL
CL
S
S
S
S
+
+
+
–
–
–
–
+
24V DC
24 V DC
100 - 240 V AC
120 Ω
2
7
+ 24 V
CL
CH
-
0 V
+
+
-
–
C
H
C
L
Option
Fig. 6
Important notes on connecting the CAN bus system
■
■
A dedicated 24 V DC SELV power supply unit that is isolated from connected loads must be used to
supply the SPECTOR
connect system.
■
■
Make sure wiring is in line, not in a star!
■
■
Avoid potential differences in system parts by connection to a central earthing point.
■
◆
Connect the bus line shields to one another all the way along, and connect them to the central
earthing point (CEP).
■
■
If two or more system components are connected in a CAN bus network, a 120 Ω terminating resistor
must be connected to the
first
and
last
units between terminals C
L
/ C
H
.
■
■
If you are using the URB 60 as the first or last device, connect the terminating resistor between pins 2
and 7 in the CAN bus connector.
■
■
Connect the supplied data cable to terminals 14 (CHigh) and 15 (CLow)
of the last
safety control unit
or controller in the control cabinet. The connector of the data cable leading to the URB 60 contains a
120 Ω terminating resistor, so that the terminating resistor on the safety control unit or controller is no
longer required.
■
■
Only
one
URS 60 and
one
URS 61 safety control unit may be used in the CAN bus network.
■
■
The CAN bus network must not be interrupted during operation!
If it is, an alarm is triggered.
