Protocol Specifications

All BradCommunications™ Direct-Link™ networks interface cards for Profibus-DP support following protocols:

DP-V0 Master/Scanner Class-1 & -2 and Slave modes simultaneously

DP-V0 Slave passive mode only

DP-V1 Master Class-1 & -2 (for PCU card)

DP Master features

DPV0 Master/Scanner Class-1 for optimized exchange of input/output data with the slaves

(Data_Exchange).

DP-V0 Master Class-2 for:

Slave diagnostics

Reading inputs/outputs of a slave

Reading configuration data

Changing the slave address.

Access Modes

DP-V1 Master Class-1 & -2:

Read Data Block Class 1

Write Data Block Class 1

Read Data Block Class 2

Write Data Block Class 2

Abort Data Block Comm Class 2

Multi-master mode

Yes (able to share the bus with other DP masters connected on the network)

Watchdog control

Yes, enables the master to switch into error if no data has been exchanged during this period

(Bus Fault)

Input/Output Data

Memory of I/O data image:

o

PC/104:

up to 2Kbytes

o

PCI-Universal:

up to 8Kbytes

o

PCI Express:

up to 8Kbytes

o

CompactPCI:

up to 4Kbytes

Manage up to 244 data bytes per slave

Automatic organization of I/O data in the DPRAM memory

Max. DP Slave

Connect up to 126 slaves

Data consistency

Yes (i.e. user gets the data up to 122 bytes of a slave from one and the same DP cycle)

Data format

Direct access to variable types (bit, byte, word, double word)

Local DP slave

Run simultaneously with Master modes.

Offers data exchange with another master on the network. The size of the input and output data

is user-definable, and all exchange combinations are possible (from 0 to 244 bytes). The slave

can ensure data consistency up to 122 bytes. (see DP-Slave features below for details).

DP Slave passive features

Access Mode

DP-V0 Slave passive (no management of Profibus token)

Input memory size

Configurable from 0 to 244 bytes

Output memory size

Configurable from 0 to 244 bytes

Slave address

Configurable from 0 to 126 by software configuration

GSD files

Provided on the CD-Rom

Data Format

Configurable Intel or Motorola

Address Assignment

Not supported

Extended Diagnostic

Not supported

Direct-Link™ Profibus-DP