User`s manual

GFK-2334A Chapter 5 PROFIBUS Master Status and Diagnostics 5-11
5
DPM State
This byte indicates the current control state of the Dual Port Memory in the master. DPM
State is reported in Word 3 of the Get Master Status reply data and the high byte of Word
4 of the Read Module Header reply data (described on page 5-17).
The following table provides definitions of the possible values.
Value DPM Master
State
Description
0x00 OFFLINE The master system has been switched on, but there is no data transfer
on the bus.
0x40 STOP The master loads bus parameters and initializes the diagnostic buffer. No
data transfer takes place.
0x80 CLEAR The master parameterizes and configures the slaves through the bus. It
reads the input data, but retains the output data.
0xC0 OPERATE User data transfer is active. New output data is transmitted cyclically and
the latest input data is read.
Error Remote Address (Low Byte Word 4)
The Error Remote Address field contains the physical address of a device that has caused
an error. If the master is the source of the error, this byte contains the value 255. If the
error was detected at or reported by a network device, the byte contains the source
station address and has a range from 0 to 125. If this field is contains an address, the
Error Event byte will contain a code that identifies the error.
Error Event (High Byte Word 4)
The Error Event byte contains the error code of the device identified in the Error Remote
Address field. This error code is also reported in the high byte of Word 5 of the Read
Module Header reply data (described on page 5-17).
For descriptions of master errors, see the table on page 5-12. For slave device errors, see
page 5-13.