Owner manual

Using the Parameter Messaging 6-3
This protocol uses 4 words in the Profibus I/O area. Requests and
responses are a handshake procedure and cannot be batched, meaning
that if the master sends a request, it has to wait for the response before
sending a new request.
With this protocol you can:
• Read 8-bit or 16-bit parameters from any DSI port
• Write 8-bit or 16-bit parameters to any DSI port
• Read the Adapter Fault Code
• Read Events
• Read Diagnostic Items
Figure 6.2 Parameter Message Format
See Parameter Message Request on page 6-4 and Parameter Message
Response on page 6-5 for a description of the data that is required in
each word.
Parameter Protocol
Bit 15-12 11 10-0 15-12 11 10-0
Parameter Access
Word 1 (PCA)
RC SPM PNU RC SPM PNU
Parameter Access
Word 2 (IND)
Subindex Subindex
Parameter Access
Word 3 (PVA)
Spare Spare
Parameter Access
Word 4 (PVA)
Parameter value Parameter value
Request
Response