Rockwell Automation RECOMM-PBUS PROFIBUS Communications Module - Manual (Page 79)

Using Explicit Messaging (Parameter Protocol) 7-5
7.3.2 Parameter Message Response
Table 7.2 – Parameter Message Response Data
Word Description
1 PNU - Parameter Number (Bit 0-10)
Requested parameter number.
SPM (Bit 11)
Reserved - is always set to 0.
RC - Response Code (Bit 12-15)
One of the following codes will be sent:
0 = No request
1 = Transfer parameter value (8-bit & 16-bit word)
2 = Transfer parameter value (32-bit word)
3-6 = Reserved
7 = Request rejected. Error message is found in word 3.
See table below for fault number description.
8 = No parameter change rights
9-15 = Reserved
2 IND - Index
Port ID of requested parameter
3 PVA - Parameter value (32-bit high word)
The parameter value. If the parameter is 32 bits, the most
significant bytes are placed here.
If a fault was requested (parameter 1024-2048), this word
contains the fault code, that identifies the fault.
4 PVA - Parameter value (32-bit low word or 8-bit & 16-bit
word).
The parameter value. If the parameter is 32-bits, the least
significant bytes are placed here. If the parameter is 16-bit
or lower, the entire result is placed in this word.
If a fault was requested (parameter 1024-2048), the MSB
contains the DPI port number that caused the fault, and the
LSB contains the DPI object instance that cause the fault.
Table 7.3 – Parameter Message Response Fault Numbers and Descriptions
Fault
Number Description
101 Service not supported (i.e., set service to a read-only
parameter)
102 Service not valid
104 Parameter does not exist (i.e., parameter
number>max number of parameters)
106 Data value out of range (i.e., set value is out of range)
107 State conflict (i.e., parameter is not changeable while
the product is in an operating state)