Rockwell Automation RECOMM-PBUS PROFIBUS Communications Module - Manual (Page 83)

Using Explicit Messaging (Parameter Protocol) 7-9
Write Examples
Request Response
RC
“2” (‘0010’ binary) to write a 8-bit or 16-bit
parameter
“3” (‘0011 binary) to write a 32-bit parameter
RC
“1” (0001’) Transferring a 8-bit or 16-bit
parameter value
“2” (‘0010’) Transferring a 32-bit parameter
value
“7” (‘0111’) Request rejected (including fault
number)
SPM
Not used
SPM
Not Used
PNU
Parameter number being written
PNU
Confirms the parameter number (equals the
PNU from the request)
Subindex
Selects which DPI port to talk to (“0”= DPI
Hosts “5”= RECOMM-PBUS on SP600
drives)
Subindex
Confirms the DPI port (equals the Subindex
from the request)
Parameter value high
Contains the high word if writing a 32-bit
parameter
Parameter value high
Confirms the high word if writing a 32-bit
parameter.
Parameter value low
Contains the write value for a 8-bit or 16-bit
parameter, or the low word if writing a 32-bit
parameter
Parameter value low
Confirms the write value for a 8-bit or 16-bit
parameter, the low word (if writing a 32-bit
parameter, or the fault code (if RC=”7”)
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) Parameter value high
(32 bit high word)
Parameter value high
(32 bit high word)
Parameter Access
Word 4
(PVA) Parameter value low
(32-bit low word/
or 8-bit/16-bit value)
Parameter value low
(32-bit low word/
or 8-bit/16-bit value)
Request
Response