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6.1
Description
Supported Productive Services
The SPC 4-2 supports the following productive services of PROFIBUS DP (DIN
19245 part 3, EN 50170 volume 2, IEC 61158, IEC 61784-1)
●
Data Exchange
●
Read Input Data
●
Read Output Data
●
Global-Control (Sync, Freeze, Clear-Data)
Other DP Services
Other PROFIBUS-DP services (diagnostics, parameter assignment, and
configuration) must be implemented by the FLC; in other words, the software must
operate the appropriate SAPs according to the PROFIBUS DP state machine.
If the SPC 4-2 is to support the services above, DP mode = 1 must be set in mode
register 0.
In the DP mode, the data exchange between the DEFAULT SAP of the DP master
and the DEFAULT SAP of the DP slave is achieved using swap buffers:
The indication buffers D, N, and U are available for received data (output data).
The reply update buffers D, N, and U are used for reply data (input data).
Interrupt
An indication interrupt is not generated. If new output data are available to the FLC,
the "Output Data Exchange" interrupt is generated. The "Watchdog Reset" interrupt
shows that valid output data have been received from the DP master at the
DEFAULT SAP. The "Watchdog Reset" interrupt, instructs the FLC to reset the
"Software Watchdog" that monitors the activity of the DP master.
52
PROFIBUS Controller SPC 4®-2 LF
C79000-G8976-C157-3
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