
12 /1105 Hans Turck GmbH & Co.KG • Witzlebenstraße 7 • D-45472 Mülheim an der Ruhr • Tel. +49 208 4952-0 • Fax +49 208 4952-264 • www.turck.com
BL67 and DeviceNet™ (Overview)
System data DeviceNet™
Number of nodes 64 (incl. master)
Number of I/O points depending on control system
Transmission medium shielded twisted copper cable, at least 2 x 2 x 0.21 mm²
I/O communication types polling, change of state, cyclic, strobed
Transmission Bus lines – max. length Drop lines – max. length No. of nodes
speed Flat Cable Thick Cable Mid Cable Thin Cable (per drop) (total) (max.)
125 kbps 420 m 500 m 300 m 100 m 6 m 156 m 64
250 kbps 200 m 250 m 250 m 100 m 6 m 78 m 64
500 KBit/s 75 m 100 m 100 m 100 m 6 m 39 m 64
DeviceNet™ DeviceNet™ is an open, standardised bus
system according to EN 50325 and is
based on the CAN specification (Controller
Area Network). As a multimaster system
DeviceNet™ provides the following I/O
communication modes:
• Polling: the master module cyclically
sends output data to all subordinate
slaves and receives input data via the
response message.
• Change of state: telegrams are not
sent constantly, but only if the contents
has changed, i.e. the process image/
mapping is only transferred when it
changes.
• Cyclic: the nodes automatically
send data after a certain cycle time
• Strobed: the scanner requests input
data via a broadcast message to all
bus nodes.
The bus length depends on the trans-
mission speed (125, 250 or 500 kbps) as
shown below in the table.
• Open fieldbus standard according
to EN 50325
• Transmission medium:
cable, 2 x 2 wires, twisted
shielded, for data transmission and
for power supply (24 V)
• Transmission technology: CAN
• Bus topology: Line structure
(bus termination on both ends)
with drop lines
• Bus access mode:
Multi-master system
with CSMA/CA access mode,
network-wide multi/broadcasting
• Use of repeaters in order to
extend the length of the trunk and
drop line
• Max. 64 nodes (incl. master)
• Addressing via coding switch
• Configuration/parameterisation of
the devices via standardised EDS
files (Electronic Data sheets)
Due to this especially efficient usage of the
bus capacities, it is possible to achieve
short response times, particularly in the
change-of-state mode (despite relatively
low data rates).
Configuration/Parameterisation
Module addresses from 0...63 are
adjusted via two decimally coded rotary
switches. The system speed corresponds
to the transmission rate set via the master.
The transmission speed is automatically
detected by the BL67 modules (auto
baud).
The manufacturer provides EDS files (EDS
= Electronic Data Sheet) for configuration
of the individual DeviceNet™ nodes.
DeviceNet™ devices are parameterised via
acyclic services (Explicit Messaging).
TURCK additionally offers the
I/O-ASSISTANT, a helpful software tool
for configuration, parameterisation and
set-up of the individual modules.
DeviceNet™ – Transmission speed and bus lengths
Digital inputs, 4 DI/DO
Digital inputs, 8 DI/DO
Digital outputs, 16 DO
Analogue inputs, 2 AI
Analogue inputs, 4 AI
Analogue inputs, 2 AI-PT
Analogue inputs, 2 AI-TC
Analogue outputs, 2 AO-I
Analogue outputs, 2 AO-V
128
256
512
64
124
64
64
64
50
32
32
32
32
31
32
32
32
25
Module type Channels
Max. no./station
Modules
Max. no./station
NOTE:
The maximum number of modules is
dependent on the respective system
configuration. The maximum number may
be limited as the maximum current
consumption on the module bus may not
exceed 1.5 A (refer to the rated current
consumption table, page 18). A limitation
may also result if modules with extensive
process, parameter and diagnostic data
are used. The I/O-ASSISTANT takes this
fact into consideration and issues a
warning message if appropriate.
BL67-Station – Maximum System Extension
A BL67 station can be comprised of the gateway for DeviceNetTM and a maximum of 32
modules (corresponding to a station length of approx. 1 m)