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Introduction To ProfiBus DP

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Acromag, Inc. Tel:248-624-1541 Fax:248-624-9234 Email:sales@acromag.com http://www.acromag.com

The parameter Status can be tested to indicate the success or failure of

the Diag_Data function with possible values of: OK, DS, NA, RS, UE, NR,

and RE.

The following bits are taken from the diagnostic information bytes above

and treated as follows:

PRM_REQ (From DU Byte 2)

If this flag is set, the slave has to be parameterized. The application

has detected a state requiring a new startup with appropriate

reparameterization and reconfiguration. Following this diagnostic, the

master performs a startup with specified reparameterization and

configuration.

An example where this type of diagnostic might occur is if a modular

ProfiBus system has been expanded (i.e. a module was added).

There are three diagnostic bits that can be driven by the application:

STAT_DIAG, EXT_DIAG, and EXT_DIAG_OVERFLOW.

STAT_DIAG (From DU Byte 2)

Because of a state in the application, the slave cannot provide valid

data. After receiving this diagnostic, the master continues to request only

diagnostic information from this slave until the slave resets this bit. If the

normal ProfiBus DP state is data exchange, data communication can be

resumed immediately after the static diagnosis bit is cleared. An example of

where this diagnostic may be encountered is for a slave whose output driver

voltage supply has failed.

EXT_DIAG (From DU Byte 1)

The slave uses the EXT_DIAG=1 bit to signal that user-specific

diagnostic data is present in the user diagnostics area. EXT_DIAG=1

causes a diagnostic telegram to be sent to the ProfiBus master. After the

cause of the diagnostic message has been corrected (the applicable bit

combination in the user-related diagnostic data is 0), the EXT_DIAG bit must

also be reset (set to 0) and this is necessary for certification.

If this bit is set, a diagnostic entry must be present in the user-related

diagnostic area. If this bit is clear, then the standard status information of

the diagnostic area is involved and this is handled with a lower priority.

When the EXT_DIAG bit is cleared (0), the data must be considered as

status information from the viewpoint of the system and this data is not

treated as diagnostic data by the master.

EXT_DIAG_OVERFLOW (From DU Byte 3)

The slave sets this bit when more diagnostic data is available than will

fit into the area provided for diagnostic data. For example, more channel

diagnostic data may be present than the sending buffer or the receiving

buffer of the master can hold.

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