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8 DTU3005P Profibus Application Notes

Siemens Energy & Automation, Inc. 45

8 DTU3005P Profibus

Application Notes

8.1 System Overview and

Configuration

The DTU3005P is an intelligent transfer unit that

transfers data between SEAbus devices on Port 2

and a Profibus-DP host on Port 1. Port 3 is used as a

Passthrough port in which all messages received are

simply passed through to the SEAbus devices on

Port 2.

Port 3 on the DTU3005P is also used to send and

receive configuration information from a personal

computer running the DTU3005P Configuration soft-

ware. The communications parameters (baud rate,

data bits, parity, etc.) and timing parameters are con-

figured for the SEAbus ports using this software as

well as the DTU3005P address on the Profibus net-

work.

8.2 Profibus and SEAbus Device

Configuration

The list of SEAbus devices that data is transferred

from can be set up in two different ways:

1. Using the DTU3005P Configuration software

2. Using the user parameter area of the Profibus-

DP slave configuration sent by the Profibus host

If the SEAbus device configuration has been set up

using the Configuration software, it will be overrid-

den by a valid SEAbus device list received in the

Profibus user parameter data. The format of the

Parameter Data in the slave configuration is shown

in Ta b le 8 .1.

*For more information,see the device type codes

list in Section 8.4.

Any number of parameter bytes from 0 to 65 are

accepted by the DTU3005P. If the SEAbus devices

are configured through the Profibus-DP interface in

the user parameter data, only the number of bytes

required to configure the desired number of devices

is required. Additional bytes are ignored by the

DTU3005P, if present.

Note: When a valid SEAbus device list is

received in the user parameter area of the

Profibus-DP slave configuration, the new

device list is stored in non-volatile mem-

ory and used each time the DTU3005P is

powered up (unless overwritten by a new

Profibus-DP slave configuration message

or changed with the Configuration soft-

ware.)

8.3 Profibus Input/Output

Configuration

The input/output configurations are provided in the

Device Database file (PNTL3005.GSD) for the

DTU3005P unit (see Ta ble 8 .2 ):

8.4 Profibus Input Data

The input data transferred to the Profibus host will

vary depending on the configured input length and

the data read from a specific SEAbus device. When

16 words of input are configured, a special subset of

the collected real-time data for each type of device

is transferred.

For all other input configurations, the real-time data

as presented in Appendix C of the DTU3005P man-

ual is transferred. The data will be transferred

exactly as presented in the manual with three

exceptions:

Table 8.1 Slave Configuration Format

Byte Designation

0 Must be set to 0

1 Number of SEAbus devices being configured

2 Device Type Code for Device 0 (1st device)*

3 SEAbus Address for 1st device

4 Device Type Code for Device 1 (2nd Device)*

5 SEAbus Address for Device 1 (2nd Device)

Device Type Code and Address for Devices 2-30*

64 Device Type Code for Device 31 (if required)*

65 SEAbus address for Device 31 (if required)

Table 8.2 DTU3005P Input/Output Configurations

16 Words In, 0 Words Out 24 Words In, 0 Words Out

16 Words In, 4 Words Out 24 Words In, 4 Words Out

32 Words In, 0 Words Out 40 Words In, 0 Words Out

32 Words In, 4 Words Out 40 Words In, 4 Words Out

48 Words In, 0 Words Out 56 Words In, 0 Words Out

48 Words In, 4 Words Out 56 Words In, 4 Words Out

60 Words In, 0 Words Out

60 Words In, 4 Words Out

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 119 120

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