ESD CPCI-405, Hardware Manual, Page: 47 / 57

Wiring Notes
CPCI-405
Hardware-Manual • Doc.-No.: I.2306.21 / Rev. 3.5
Page 47 of 57
u vw x wy
u vwz {
uvw z |
u vwz x wy
} ~  ~
} ~  ~
} ~  ~
} ~  ~
} ~  ~
} ~  ~
} ~  ~
} ~  ~
} ~  ~
} ~  ~
€ ‚ ƒ„
€‚ƒ
€ ‚ ƒ† ‚‡
ˆ‰Š ‹Œ
€ ‚ ƒ† ‚‡
Ž‘Ž ’ “ Ž‘Ž’ “
”
•
–
—
˜
™
š
›
œ
—
™
š
”
•
–
›
˜
œ
} ~  ~
} ~  ~
ˆŠ ž Œ‹ Ÿ ‰ Š‹Œ ‹
 ¡ ¢Œ ‹ £¤ ŠŸ£ ‹  ¥ ¦Š§ ¨ ¦¢ Œ ‹
© ª ¡§« ¤Š§‹ ¨¦¢Œ ‹¬
­® ­® ¯°­­± ± ² ³
´µ¶ · ¸¹ µ·º»
¼ ½¾¿ À ÁÂÃ Ä Å
Æ ÇÈÉÊ Ë ÌÍÎ
Ï ½Ð ÑÁÒ ÁÓ Ó ½ ÐÑ Ô ¿ÑÅ ÃÕ Ó½Ñ ÐÒ ¿ Ó Ö½ ¿Ò× ¿× ×ÃÄ Ø Ò¿ Å Ù ½ÓÅ¿× Ú Á½¾ ÛÁØ Ò¿
Ù ½ ÅÖ ¿ Á ¾ÅÖ Á Ñ × Å¿¾Ô ½ ÑÁŽ ÃÑ
}~ ~ Ü }Ý Þ Ý }}·  Þ· »
ßà á âã äå ææ ’ä Ž å ç
èé’ê ë ì ’ åç êëì’ í
îæ “ ’ ‘ïæ ë Ž åæ
ð ñ òòóðô ñõ ðö÷ó
ßà á âã äå ææ ’ä Ž å ç
èé’êë ì ’ åç êëì’í
îæ “ ’ ‘ïæë Ž  å æ
ø ùú ð ö ûüó ý þô ÿ ð ñ òòóðô ñõ÷
ðñ ò òóðôñ õ ðö÷ ó
Í É Æ ÇÎ
6.2 Heavy Industrial Environment (Double Twisted Pair Cable)
6.2.1 General Rules
Note:
esd only grants the compliance with directive 2014/30/EC, if the CAN wiring is carried
out with single shielded double twisted pair cables that match the requirements of ISO
11898-2.
The following general rules for CAN wiring with single shielded single twisted pair cable must be
followed:
1 A cable type with a wave impedance of about 120 ±10% with an adequate conductor cross
section ( 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
two twisted wires to the data signals (CAN_H, CAN_L) and
other two twisted wires to the reference potential (CAN_GND) and
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
±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. 2: CAN wiring for heavy industrial environment