Technical data

62
Manual – MOVI-PLC® advanced DH.41B Controller
6
Introduction to PROFIBUS-DP-V1
PROFIBUS-DP-V1 Functions
6 PROFIBUS-DP-V1 Functions
6.1 Introduction to PROFIBUS-DP-V1
This section describes the functions and terms used for operating the MOVI-PLC
®
advanced DHF41B control card on PROFIBUS-DP-V1. Refer to the PROFIBUS user
organization or visit www.profibus.com for detailed technical information on PROFIBUS-
DP-V1.
The PROFIBUS-DP-V1 specification introduced new acyclical read/write services within
the context of the PROFIBUS-DP-V1 expansions. These acyclical services are inserted
into special telegrams during cyclical bus operation and thus ensure compatibility
between PROFIBUS-DP (version 0) and PROFIBUS-DP-V1 (Version 1).
Acyclical read/write services can be used to exchange larger volumes of data between
master and slave (MOVI-PLC
®
advanced DHF41B control card) than it would be
possible to transfer with the cyclical input or output data via the 8-byte parameter
channel. The advantage of the acyclical data exchange via DP-V1 is the minimum load
on the cyclical bus operation. DP-V1 telegrams are only added to the bus cycle if
required.
The DP-V1 parameter channel offers the following options:
• The higher-level controller can access all the device information of the SEW DP-V1
slaves. This means that cyclical process data and unit settings can be read, stored
in the higher-level controller and modified in the slave.
• It is also possible to route the MOVITOOLS
®
MotionStudio service and startup
software via the DP-V1 parameter channel instead of using a proprietary RS485
connection. Once you have installed the MOVITOOLS
®
MotionStudio software, you
can access detailed information in the folder...\SEW\Movitools\Fieldbus.
The main features of PROFIBUS DP-V1 are shown in the figure below.
58378AXX
Acyclic DP1-V1
C1-Services
C1-Master C2-Master C2-Master
PROFIBUS DP-V1
Acyclic DP1-V1
C2-Services
Acyclic DP1-V1
C2-Services
PD
PD
Param
Param
Cyclic OUT Data
MOVI-PLC
®
00
I