GEMAC CANalarm User manual

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Fax: [phone] - 272
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GEMAC Chemnitz GmbH
Zwickauer Straße 227
09116 Chemnitz
Germany
CANalarm®
User Manual

GEMAC Chemnitz GmbH
Zwickauer Straße 227
09116 Chemnitz
Germany
Version: 1.4
Date: 07/17/2018
Telefon: [phone] - 0
Telefax: [phone] - 272
E-Mail: info@gemac-chemnitz de
Web: www gemac-chemnitz de
User Manual
CANalarm®

Revision Overview
Version Overview
Date Revision Change(s)
06/10/2015 0 First version
09/29/2015 1 Description for the new user interface of the message trigger
Error correction
12/12/2016 2 Updated Logos, Declaration of Conformity
08/08/2017 3 New company name
07/17/2018 4 Changes in Declaration of Conformity
© Copyright 2018 GEMAC Chemnitz GmbH
Subject to change without prior notice
Our policy is one of continuous improvement, and consequently the equipment may vary slightly from the
description and specifications in this publication The specifications, illustrations and descriptions provided in
this documentation are not binding in detail
No part of this publication may be reproduced in any form, or by any means, without the prior written permis -
sion of GEMAC Chemnitz GmbH
All rights according to the copyright law are expressly reserved to GEMAC Chemnitz GmbH
Note:
Use of the CANalarm® device and proper understanding of this manual require general knowledge of the
CAN-Bus, CANopen, DeviceNet and/or SAE J1939 fieldbus systems
IV Document: 22565-HB-1-4-E-CANalarm

Table of Contents
Table of Contents
1 Introduction 1
2 Start-up 2
2 1 Receiving inspection 2
2 2 Handling 2
3 Overview of the CANalarm® 3
3 1 Connections 3
3 2 Buttons 4
3 3 Operation modes 4
3 4 Status LEDs 4
4 Diagnosis Functions 5
4 1 Bus traffic load 5
4 2 Faulty telegrams 5
4 3 Monitoring of malfunctions 6
4 4 Message trigger 6
5 Configuration 7
5 1 Configuration at the device 7
5 2 Remote configuration 7
6 License Management 14
7 Technical Specifications 15
8 Ordering Information 15
9 Notes 16
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1 Introduction
1 Introd ction
Thank you for purchasing the CANalarm® You have acquired a tool supporting you in the start-up, analysis,
monitoring and servicing/maintenance of your CAN bus system
Thanks to its wide range of applications, its high data transfer rate and above all through its high tolerance
against interference in the field of plant automation, the CAN bus has been well established for the last few
years Nonetheless, even when starting up new plants, but also during operation, a large number of prob-
lems occur, resulting quickly in undesired and often expensive failures
The CANalarm® in the form of a 9-pin D-Sub field bus connector is designed for the logical monitoring of
CAN bus systems and is integrated via plug&play into an existing and running system As a passive bus
node, it detects without interaction and continuously typical characteristics of a CAN communication and
compares it with user settable trigger criteria:
Bus traffic load
Number of error frames
ID and content of the transmitted telegrams
As soon as at least one of the trigger criteria is met, this condition is indicated by a status LED and by a po -
tential-free switching output The switching output is also integrable in the system control, so that an inde-
pendent monitoring system can be realized in a simple way
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2 Start-up
2 Start- p
2.1 Receiving inspection
Carefully unpack and check the device and completeness of the delivery immediately after receipt If trans-
port damage is suspected, inform the delivery agent within 72 hours and keep the packaging for inspection
The device must only be transported in its original or equivalent packaging
2.2 Handling
Always handle the CANalarm® with the required care Its display is made of glass and thus may break if the
device falls on a hard surface or is subjected to hard impact Before turning on the CANalarm®, allow the de-
vice to warm up to room temperature When operating the device, it is imperative to observe the general ac-
cident prevention regulations relating to the use of measuring instruments The device must only be used in
dry rooms
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3 Overview of the CANalarm®
3 Overview of the CANalarm®
3.1 Connections
3.1.1 Connection to the CAN b s
The CANalarm® is connected to the CAN bus system by way of a 9-pin D-Sub connector The connector pin
assignment complies with CiA DS-102
Pin Signal Connector Pin Assignment
1 - -
2 CAN_L CAN_L bus line
3 CAN_GND -
4 - -
5 CAN_SHLD Shield
6 CAN_V- / GND GND / 0 V / V-
7 CAN_H CAN_H bus line
8 - -
9 CAN_V+ Optional external supply voltage (+24 V)
Table 1: Connector pin assignment
3.1.2 Power s pply
The CANalarm® is power supplied via either its CAN connector or its 4-pin connector (Table Table 2)
Pin Signal Connector Pin Assignment
1 Vcc External supply voltage
2 + 3 SWITCH Potential-free switching output
4 GND Ground of the external supply voltage
Table 2: Pin assignment of the 4-pin connector
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3 Overview of the CANalarm®
3.1.3 Switching o tp t
Additionally, a potential-free switching output is led through at this 4-pin connector (Table Table 2) It is used
as signal output, which displays the incidence of a trigger event according to its configuration A triggered
switching output can be reset automatically by the device or manually by shortly pushing the RESET-button
(Chapter 5 „Configuration“) An external over-current protection is required for the potential-free switching
output
3.2 Buttons
For its operation, the CANalarm® is equipped with two push buttons (RESET and MODE) Their functionality
is described in the according chapters of this user manual
3.3 Operation modes
The CANalarm® can be used in three operation modes:
Normal Mode:
As a passive bus node, the CANalarm® analyzes the data traffic of the CAN bus and shows the re-
sults via its display and its status LEDs
You can switch forward the displayed values by pushing the MODE button shortly The CANalarm®
is re-started if you keep the RESET button pressed for at least 3 seconds
Config Mode:
The CANalarm® is also a passive bus node and can be configured via its operation buttons (Chapter
5 1 „Configuration at the device“) You can switch between Config and Normal Mode by keeping the
RESET and the MODE buttons pressed for one second simultaneously
Remote Mode:
The CANalarm® is an active bus node and can be configured by the CAN bus via the PC software
“CDS Configuration Tool” (Chapter 5 2 Remote configuration“) You can switch into this mode by us-
ing the PC program
3.4 Status L Ds
Dependently from the operation mode of the CANalarm®, the LEDs show the recent status of the bus or of
the device (Table Table 3)
Normal / Config Remote
green
off: no power supply
flashing: automatic baud rate scan is in process
on: baud rate detected, but no bus activity recognized
blinking: bus activity recognized
off: no power supply
fli kering: automatic baud rate scan is in process
on: standard operation mode
red off: switching output opened
on: switching output connected through
off: device is running without errors
simple flash: passive-error-mode
on: active-error-mode
Table 3: Modes of the state LEDs
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4 Diagnosis Functions
4 Diagnosis F nctions
4.1 Bus traffic load
Problems in the planning, diagnosis and alarm messages as well as bad transmission characteristics with
resulting sporadic repetitions of telegrams may increase the bus traffic load A permanent measurement of
the bus traffic load may uncover such problems
To ensure a correct measurement, merely the correct baud rate of the CAN bus segment has to be set and
the CANalarm® must be connected to the CAN bus system Then, the device measures the bus traffic load
continuously for a second In case the bus traffic load exceeds a settable threshold, a trigger signal is sent
4.2 Faulty telegrams
Error Frames are a component of the error management in the Data-Link-Layer, which is implemented in all
CAN controllers It is able to recognize the following error types:
Bit errors
Bit-Stuffing errors
CRC errors
Format errors
Acknowledgment errors
Each error, which is recognized by the error management, is transmitted to all nodes by an Error Frame
This procedure is achieved with a deliberate coding violation Then, all CAN controllers will discard the tele-
gram, which has been destroyed by an Error Frame and the sending CAN controller repeats the transmis -
sion
The counter for error telegrams and the monitoring of the bus traffic load are a real-time monitoring function
This measurement is based on the test of the protocols of all transmitted telegrams on the bus system If an
active or a passive Error Frame is recognized, the relevant counter is increased In general, this counter
should display the value „0“ However, if errors occur occasionally or often, problems in the physical layer of
the bus and from these resulting transmission errors are most likely the reason These can be detected by a
more detailed analysis of the CAN bus with appropriate diagnosis devices (e g CAN-Bus Tester 2 or CAN-
touch®)
The counter of error telegrams of the CANalarm® counts up to maximum 99,999,999 errors and identifies
the number of error frames per second, additionally For its correct operation, it is essential to set the appro-
priate baud rate of the CAN bus segment If a wrong baud rate is set, the faulty detection of telegrams can
cause the increase of the counter of error telegrams in case of each data transmission
Maximum values for the absolute and in time standardized error frames can be determined As soon as
these values are exceeded, the CANalarm® activates a trigger
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