ESD C.3010.02, Manual

Page: 38 / 123

Wiring Notes
Manual • Doc.-No.: C.3010.21 / Rev. 3.1
CAN-CBX-DIO8 Seite 38 von 123
æ çè é èê
æ çèë ì
æçè ë í
æ çèë é èê
î ï ð ï
î ï ð ï
î ï ð ï
î ï ð ï
î ï ð ï
î ï ð ï
î ï ð ï
î ï ð ï
î ï ð ï
î ï ð ï
ñò ó ôõ
ñòóôö ñò ó ô÷ óø
ùúû üýþ
ñò ó ô÷ óø
ÿ ÿ
ÿ ÿ
î ï ð ï
î ï ð ï
ùû ýü ú ûüýþ üþ
þ ý ü û ü þ û ý ü
ûü ý ü
! " " # $
%&' ( )* &(+,
- ./0 1 234 5 6
7 89:; < =>?
@ .A B2C 2D D . AB E 0B6 4F D.B AC 0 D G. 0CH 0H H45 I C0 6 J .D60H K 2./ L2I C0
J . 6G 0 2 /6G 2 B H 60/E . B26. 4B
îïð ï M îN O ðN îî( ð O( ,
PQ R ST UV WW U ÿ V X
YZ[ \ ] VX [\] ^
_ W `W \ ÿ VW
a b ccdae bf aghd
PQ R ST UV WW U ÿ V X
YZ[\ ] VX [\]^
_ W `W\ ÿ V W
i jk a g lmd n oe p a b ccdae bfh
ab c cdaeb f agh d
> :q rs 7t 8?
6.3 Heavy Industrial Environment (Double Twisted Pair Cable)
6.3.1 General Rules
The following general rules for CAN wiring with single shielded double twisted pair cable should
be followed:
1 A cable type with a wave impedance of about 120
u
±10% with an adequate conductor cross
section (
v
0.22 mm²) has to be used. The voltage drop over the wire has to be considered.
2
For heavy industrial environment use a four-wire CAN cable.
Connect
w
two twisted wires to the data signals (CAN_H, CAN_L) and
w
the other two twisted wires to the reference potential (CAN_GND) and
w
the cable shield to functional earth (FE) at least at one point.
3 The reference potential CAN_GND has to be connected to the functional earth (FE) at
exactly one point.
4 A CAN bus line must not branch (exception: short cable stubs) and has to be terminated with
the characteristic impedance of the line (generally 120
u
±10%) at both ends (between the
signals CAN_L and CAN_H and not to CAN_GND).
5 Keep cable stubs as short as possible (l < 0.3 m).
6 Select a working combination of bit rate and cable length.
7 Keep away CAN cables from disturbing sources. If this cannot be avoided, double shielded
cables are recommended.
Fig. 17: CAN wiring for heavy industrial environment