Installation
L
66
EDBEPM-H520 DE/EN/FR 4.0
3.2.2
Wiring of system bus (CAN)
Principle structure
Shield
CAN-
-V
CAN+ N.C.
CG LO HI
CG LO
CG LO HI
CG LO HI
HI
120
120
A
n
A
2
(H520)
A
1
h520_006
Fig. 3-2
Wiring of system bus (CAN)
A
1
Bus station 1
A
2
Bus station 2
A
n
Bus station n
!
Only connect terminals of the same signal type.
!
Features of the signal cable:
Total cable length
Up to 300 m
300 to 1000 m
Cable type
LIYCY 2 x 2 x 0.5 mm
2
CYPIMF 2 x 2 x 0.5 mm
2
Cab e type
Twisted in pairs with shielding
Pair 1: CAN-LOW (LO) and CAN-HIGH (HI)
Pair 2: 2 GND
Cable resistance
≤
40
Ω
/km
≤
40
Ω
/km
Capacitance per unit length
≤
130 nF/km
≤
60 nF/km
!
Connection of bus terminating resistors:
!
One resistor 120
Ω
each at the first and last bus station
Features:
!
Bus length:
– 25 m at max. 1 Mbit/s data transfer rate
– Up to 1 km at reduced data transfer rate
!
Very reliable data transfer (Hamming distance = 6)
!
Signal level to ISO 11898
!
Up to 63 bus stations possible
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