2
Functional Description
14/67 ekr 500 digital Unit Touch – CANopen User Gateway
2.4 Communication Protocol
The manufacturer specific Process Data Objects (PDOs) and
Service Data Objects (SDOs) used for the data exchange between
the ekr 500 digital Unit Touch web guiding controller and the
customer control system (e.g. PLC, machine control system) are
determined in the communication protocol.
The integrated CANopen user gateway of the ekr 500 digital Unit
Touch web guiding controller currently supports the standard
protocol 3100 only. This protocol permits the communication of a
customer control system with one ekr 500 digital Unit Touch web
guiding controller.
The standard protocol 3100 is described in chapter Protocol 3100,
page 24.
This interface description only includes information about
the manufacturer specific profile (Process Data Objects
and Service Data Objects) of the object dictionary. The
standardized communication and device profiles of the
CiA DS 301 CANopen communication profile are described
in the European Standard EN 50325-4.
2.5 Baud Rate
The baud rate determines the transmission speed for the CAN bus
communication between the ekr 500 digital Unit Touch web guid-
ing controller and the customer control system. The default baud
rate setting for the controller is 500kBit. When needed, the baud
rate can be adapted to the baud rate used by customer control
system with the DIL switches S5.7 and S5.8 on the processor
board of the web guiding controller (procedure see Setting the
Baud Rate, page 20).
2.6 CAN Bus Wiring
In accordance with ISO11898, we recommend the use of a shiel-
ded bus cable with a characteristic impedance of 120Ω. The cable
length for a reliable communication between the ekr 500 digital
Unit Touch controller and the customer control system reduces as
the baud rate increases.
Baud Rate DIL Switch Maximum
Cable Length
S5.7 S5.8
125 kBit ON OFF 500 m
250 kBit OFF ON 250 m
500 kBit OFF OFF 100 m
1 MBit ON ON 30 m
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