EMS CRep S8C S24/RMD Series User manual

EM
Thomas Wünsche
S
CRep S8C-.../S24/RMD
User Manual
CAN-Repeater

ii EMS Dr. Thomas Wünsche
CRep S8C./S24/RMDUser Manual
User manual for CAN Repeater CRep S8C.../S24/RMD
Document version: 1.3
Documentation date: October 6th, 2020
No part of this document or the software described herein may be
reproduced in any form without prior written agreement from EMS Dr.
Thomas Wünsche.
For technical assistance please contact:
EMS Dr. Thomas Wünsche
Sonnenhang 3
D85304 Ilmmünster
Tel. +498441490260
Fax +49844181860
Email: support@emswuensche.com
Our products are continously improved. Due to this fact specifications may
be changed at any time and without announcement.
WARNING: CRep S8C hardware and software may not be used in
applications where damage to life, health or private
property may result from failures in or caused by these
components.

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Content
1 Overview 1
1.1 Attributes 1
1.2 General Description 1
1.3 Ordering Information 2
2 Electrical Characteristics 3
2.1 Absolute Limiting Values 3
2.2 Nominal Values 3
3 Operating Instructions 5
3.1 Pin Assignment 5
3.2 Cascade 6
3.3 Block Diagram 7
3.4 Dimensions 8
4 Appendix 9
4.1 Instruction for Disposal 9
4.2 CE Conformity 10

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1 Overview
1.1 Attributes
•Protocol transparent CAN repeater
•8 CAN channels
•Low propagation delay
•Links for cascading up to 3 devices with one supply
•ISO 11898 compatible bus interface
•Detach of dominant locked bus segments
•Rail mountable
1.2 General Description
The compact CAN repeater CRep S8C transmits and amplifies
signals transparent to the CAN protocol. Each of the eight CAN
connections has the physical behaviour of a single bus node. CRep
S8C permits a flexible design of the network topology and offers
special support for star structured networks. Furthermore tree
structures and long stub lines are supported. Through the possibility
to use the network structure that fits the application best a reduction
of installation costs can be reached.
The maximum data rate in CAN networks, depending on signal
propagation delays, can be increased, if CRep S8C is used to
improve the network structure. An increase of the maximum node
count in a CAN network can be reached by splitting the network in
subnets that are connected by CRep S8C. Each subnet makes the
number of CAN nodes possible permitted by the drivers output
current. Where CAN signals have to be transmitted over long
distances, CRep S8C can be used for signal conditioning. The
capability to detach erroneous segments from the rest of the CAN
system reduces the impact on the intact bus segments for the most
commonly occuring errors.
The presence of power is indicated by a LED. Furthermore each
CAN channel is provided with a LED indicating that this channel has
originated a CAN message when the LED is on.

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1.3 Ordering Information
1204102xx CRep S8C5/S24/RMD
Multiport CAN repeater for rail mounting
500ns inhibit time
Note: xx denotes language of delivery:
10 German
20 English
1204103xx
1204104xx
1204105xx
1204106xx
CRep S8C10/S24/RMD
Multiport CAN repeater for rail mounting
1µs inhibit time
CRep S8C20/S24/RMD
Multiport CAN repeater for rail mounting
2µs inhibit time
CRep S8C50/S24/RMD
Multiport CAN repeater for rail mounting
5µs inhibit time
CRep S8C100/S24/RMD
Multiport CAN repeater for rail mounting
10µs inhibit time

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2 Electrical Characteristics
2.1 Absolute Limiting Values
Any (also temporary) stress in excess of the limiting values may
cause permanent damage on CRep S8C and connected devices.
2.2 Nominal Values
All values, unless otherwise specified, refer to a supply voltage of
24V and an environmental temperature of 20°C.
Parameter Min. Max. Unit
Storage temperature 40 +80 °C
Operating temperature 0+60 °C
Voltage on signal lines 30 +30 V
Maximum power dissipation (at 60°C) tbd mW
100 +35 V
Parameter Min. Typ. Max. Unit
Current consumption
(no load)
70 mA
Current consumption
(250kBit/s, 100% busload)
tbd mA
Power supply voltage 19 24 30 V
Propagation delay between
2 arbitrary CAN channels
130 200 ns
Propagation delay
cascade
810 ns
Power supply voltage

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3 Operating Instructions
3.1 Pin Assignment
A CRep S8C device includes 8 CAN segments, wired by terminal
blocks with 3 clamps. The power supply of CRep S8C is separately
wired by a terminal block with 2 clamps.
The following table shows the terminal assignment of the CAN
connector:
Pin Function
1CAN_H CAN high bus line
2 CAN_L CAN low bus line
3 GND CAN ground

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The following table shows the terminal assignment of the power
connector:
The power supply is galvanicly decoupled from the CAN system.
3.2 Cascade
It is possible to connect up to three CRepS8C into a cascade
configuration to extend the CAN channel count up to 24. The
cascade connectors are the SUBD9 plugs on the left and right side
of the device. When a cascade is used only one power supply needs
to be connected.
The following rules are mandatory:
•The cascade connectors must not be used to any other purpose
than to form a cascade with another CRep S8C.
•The cascade connection may only be done when no power is
supplied to CRep S8C.
Pin Name Function
1POWER + Positive supply +24V
2POWER  Ground

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3.3 Block Diagram
Cascade B
Transceiver 8
Transceiver 7
Transceiver 6
Transceiver 5
Transceiver 4
Transceiver 3
Transceiver 2
Transceiver 1
Cascade A
CAN low
CAN high
CAN low
CAN low
CAN high
CAN low
CAN low
CAN low
CAN low
CAN low
CAN high
CAN high
CAN high
CAN high
CAN high
CAN high
LOGIK
+24V
GND
Cascade RX
Cascade TX
Cascade RX
Cascade TX
+24V
+5V
Galvanic
Isolation

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3.4 Dimensions
All values in [mm].

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4 Appendix
4.1 Instruction for Disposal
Electronic Equipment Act (WEEE)
EMS is selling its products exclusively to commercial customers. This
is the reason why all devices are designed for commercial use and
have to be disposed appropriately. In accordance to § 10 para. 2
clause 3 Electronic Equipment Act (WEEE) the disposal of EMS
products is regulated the following way.
The equipment must not be disposed at the public collection points.
In accordance with the applicable law the disposal has to be done by
the customer for own account. The same applies to products, which
have been sold to third parties, if those parties do not take care of a
disposal in accordance to the applicable law. As an alternative the
products can be returned to EMS free of charge.

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4.3 CE Conformity

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