Siemens SIPART DR21, Manual

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2 Technical Description
2.5 Function principle
Manual
SIPART DR21
C73000-B7476-C143-08
31
6DR2801-8C 5 DI
D
Digital input module with 5 digital inputs
The module serves to extend the digital inputs already existing in the standard controller.
The inputs are designed in 24-V-logic and are potential-bound. The function is assigned to
the input by configuration of the controller (structure switches S23 to S33).
6DR2803-8P serial interface PROFIBUS-DP
The 6DR2803-8P module is a PROFIBUS-DP-interface module with RS-485-driver and electri-
cal isolation from the instrument. It operates as an intelligent converter module and adapts the
private SIPART- to the open PROFIBUS-DP-protocol.
This options card can be used in all SIPART-DR-instruments in slot 4. The following settings
must be made with the appropriate structure switches for the serial interfaces.
- Interface on
- Even parity
- LRC without
- Baud rate 9600
- Parameters/process values writable (as desired)
- Station number of choice 0 to 125
Make sure that the station number is not assigned double on the bus. The PROFIBUS-module
serves to connect the SIPART-controllers to a master system for control and monitoring. In
addition the parameters and structure switches of the controller can be read and written.
Up to 32 process variables can be selected and read out cyclically by configuration of the
PROFIBUS-module.
The process data are read out of the controller in a polling procedure with an update time
<300 ms. If the master write process data to the slave, these become active after a maximum
of one controller cycle.
A technical description including the controller-base-file (*.GSD) is available in Internet for creat-
ing a master-slave-linking software for interpreting the identifications and useful data from and
to the SIPART-controller.
Internet address: www.fielddevices.com [Edition: 05.2000])
The SIPART S5 DP and SIPART S7 DP programs are offered for DP-masters SIMATIC S5 and
S7.