Programmer's Guide ObjectC 100
© CEDES Safety & Automation AG http://csa.cedes.com/ 3
1. Introduction
The CEDES Safety & Automation measuring light
curtain system Object100 / ObjectC-100 is intended
to detect an object and measure its dimensions
reliably and quickly. A typical application is
presented in Figure 1. The system consists of the
Object100 emitter and receiver light curtains and the
electronic control unit ObjectC-100. The control unit
has many application features and is available with
various interfaces for communication with a higher
level PLC.
Figure 1: Typical application
The control unit ObjectC 100 is available with the
following interfaces:
Table 1: Object C 100 controller versions
Part no. Part name Description
104 920 ObjectC-100 I/O 2 digital inputs, 6 digital
outputs
104 901 ObjectC-100 CAN 2 digital inputs, 2 digital
outputs, and CAN interface
104 913 ObjectC-100 RS485 2 digital inputs, 2 digital
outputs, and RS485 interface
All controller types are equipped with two digital
outputs, indicating light curtain interrupted or
overheight (i.e. object is too tall) and overhang. The
ObjectC 100 I/O controller offers four aditional
outputs to monitor single beams or groups of beams
(zones). The CAN and RS485 controllers
communicate the state of each beam to a PLC.
This operational guide describes advanced features
and the communication protocols of the controller.
The principial description, settings and
commissioning can be found in the ObjectC 100
manual (Part No. 104 906).
Warning
ObjectC-100 / Object100 systems are not safety
systems! This means that any use for the protection
of people is forbidden.
ObjectC-100 / Object100 systems can only achieve
their function, if the instructions given in this manual,
and the referenced documents are exactly followed,
as well as consulting the valid laws and regulations
at the time of installation. Should these instructions
not be followed or only partially, this may lead to a
premature malfunction of the system. The installer
or system integrator will be fully responsible for the
results in such a situation.
2. ObjectC 100 CAN
2.1. Communication Protocol (CAN)
CAN communication is used for obtaining light
curtain status information. The information about
interrupted beams determines, for example, the size
of an object.
ObjectC°100°CAN offers two CAN modes. The CAN
Standard Mode (chapter°2.2) offers, beside
commands for beam states, the functionality of
overhang and overheight detection. This mode
operates up to the exception of response telegram
01 [01 Hex] as master slave communication. The
master sends a command to the ObjectC 100 CAN
(slave) and gets a response.
This mode is also valid for the ObjectC°100°RS485
controller type. It is selected with DIP switch S1 (7) =
"OFF".
The Extended CAN mode (chapter 0) distinguishes
with XY-axis and sector monitoring advanced timing
modes. In this mode there can be set configuration
parameters, where the ObjectC°100°CAN
autonomously sends status telegram on a change of
light curtain state. The Extended CAN mode is
available for the ObjectC°100°CAN controller type
only and is activated with DIP switch S1 (7) = "ON".
The CAN interface can be used with restrictions in a
CANopen network. Please contact your nearest
CEDES dealer for more information.
2.2. CAN Standard mode
2.2.1. Telegram (CAN)
A CAN telegram consists of a string of bytes. The
telegram starts with an address, followed by 1 byte,
which contains the number of data-bytes that will
follow (DLC). The telegram then finishes with these
data-bytes (in this instance 8 bytes). ObjectC-100
typically uses 8 data-bytes. Not used data-bytes
have to be filled up with 00Hex.
The ObjectC 100 data-bytes are composed of two
command bytes and six parameter bytes. ObjectC-
100-CAN supports the CAN standard 2.0A (standard
frame).