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büS/CAN open-Design

15.3

Quickstart for Type 8681 büS/CANopen

“büS”

(Bürkert system bus) stands for the communication bus developed by Bürkert and is based on the

CANopen protocol. The following steps refer to the application of the e.g. EtherNet/IP protocol using a Bürkert

gateway preconfigured for a maximum of 63 control heads.
For other gateway configurations (e.g. in conjunction with ELEMENT positioners), the specific documentation

for preconfigured Bürkert gateways must be observed.

After mounting the control heads (Type 8681 büS/CANopen) in the network, the following operations must

first be carried out on the control heads:

1.) Addressing of the control heads

According to

“15.14.2 Setting the büS/CANopen address (Node ID)”

each control head in the network must

be assigned its own unique address (Node-ID).

When using a preconfigured gateway:

For easy start-up, each control head should be assigned its unique

node ID between 1 and 63 using the DIP switches. This allows the preconfigured communication settings

between the gateway and each control head to be used. The factory setting (address “0” = softwareconfigu

rable address/node ID) should not be used furthermore.

When using a non-pre-configured gateway or when using the factory setting “0” (software-configurable

address/node ID):

A device configuration via Bürkert Communicator on site is required for start-up each

control head (see also chapter “15.14.3” on page

Error-free parameter access by the Logix Designer:

To ensure this, the new addresses should be selected

clearly arranged and in sequence (starting with “1” and without gaps in the numerical series!).
Any change of the device address requires a device restart.

2.) Setting the baud rate

Set the baud rates according to chapter

“15.14.1 Setting the baud rate”

. The combination of cable lengths

and baud rate is very important (see chapter “15.4.2 Total line length and drop line lengths of the bus cables”).
The baud rate of all devices connected to the network (including the gateway) must be the same .
Any change of the baud rate requires a device restart.

3.) “Hiding” of non-existent devices

If less than 63 devices are assigned to the gateway, the non-existent devices must be “hidden” at the gateway,

both outputs AND inputs - see chapter

“15.18 Configuration of the control head network”

, either using the

Logix-Designer (chapter “15.18.1”) or Bürkert Communicator (chapter “15.18.2”).
After the changes have been made, a device restart is required.

4.) Careful closing of the electrical connections

Due to moisture (including steam) in the system, all electrical connections (M12 plug-in connections) must be

firmly screwed on with 0.6 (+0.1) Nm. All open electrical connections must be well “sealed” with protective

caps (see information box in chapter “15.2 Network principle / Interfaces”

and also chapter “16 Accessories

for büS devices”