BECKHOFF BK3000 - Manual (Page 26)

PROFIBUS coupler BK3xx0 in the PROFIBUS DP
26 BK3xxx/LC3100
A PROFIBUS master configuration program reads the DMF data and
transfers the appropriate settings to the master. You will find a description
of this in the relevant software manual supplied by the manufacturer of
your master.
Type file (200) One of the most common and most user-friendly master units for an SPS is
Siemens’ IM308-C. The Windows software COMWIN is available for
configuring the master. The task of configuring this master unit for the
PROFIBUS is supported by the manufacturers’ documentation which
describes the performance characteristics of the slave devices. This is
supplied to users in the form of a type file. The same applies to the IM308-
B, although the software COMET200.COM provides a more modest
operating environment. The layout, content and coding of the type file are
Siemens-specific and are supported by Beckhoff, as by other
manufacturers. This file facilitates convenient project planning for any
desired DP slaves on a PC under the graphical user interface Windows
3.1. The PNO does not yet support all of this information, but will supply
information on request about manufacturers’ type files. Type files and
bitmaps are available for Beckhoff Profibus couplers.
Contact the mailbox 0 52 46 / 96 3 - 45 5, AREA 15 or via Internet
(www.beckhoff.com or ftp.beckhoff.com).
to download the type file or to order it on a diskette. The name of the file for
the IM308-B is "BK3000TE.200”, and the file for the IM308-C is called
"BK3000AE.200”. If you use German versions of COMET200.COM and
WINCOM.COM you should download the files "BK3000TD.200” and
"BK3000AD.200” respectively.
Diagnostic functions The extensive diagnostic functions of PROFIBUS DP make it possible to
localize errors rapidly. The diagnostic messages are transferred via the bus
and collated by the master. They are subdivided into three levels:
Diagnostic type
Station-
related
Messages dealing with the general operating condition of a
subscriber, such as overheating or low voltage
Module-
related
These messages indicate a diagnostic message is pending for
a subscriber within a particular I/O sub-area (e.g. 8-bit output
module)
Channel-
related
This locates the cause of the error in an individual input/ output
bit (channel), such as: short circuit on output 2
The bus couplers BK3xx0 support the diagnostic functions of the
PROFIBUS DP. The manner in which the control unit evaluates the
diagnostic data depends on what support is given by the master. Please
refer to the device manual of your master units to see how to handle the
diagnostics. (Note for ET200U experts: the diagnostics is device-specific,
as for the ET200U; a module in the bus terminal enables you to evaluate
the diagnostics for a specific station and track it right down to an individual
channel in the bus terminal.)
Sync and Freeze Mode In addition to the subscriber-related user data traffic, which DPM1 deals
with automatically, the DP master can also send control commands to an
individual DP slave, to a group, or to all of the slaves simultaneously; these
control commands are transferred as multicast functions. You can use
such control commands to impose the operating modes Sync and Freeze
to synchronize the DP slaves. This facility provides for an event-driven
synchronization of the slaves. They enter Sync mode when they receive a
Sync control command from their appointed DP master. In this operating
mode, the outputs from all the DP slaves are frozen in their current state. If
user data is subsequently transferred, the output data is stored at the DP
slaves, although the output status values remain unchanged. When the
next Sync control command is received from the master, the stored output