Chapter 6 – Communication
Installation and Start-up Guide for NPBA-01
6-2
PROFIBUS-FMS
The PROFIBUS-FMS protocol supports cyclic and acyclic data
transfer. In cyclic communication, one variable is read or written over a
connection. This is done with the
Read and Write services. (For
available services, see
FMS Services Supported below). In acyclic
communication, the application program accesses various
communication objects over a connection.
FMS Services
Supported
These services are supported by the NPBA-01 PROFIBUS Adapter
Module in PROFIBUS-FMS mode.
Initiate
With this command the master can initiate any
communication
reference (CR). The CRs supported by NPBA-01 are listed in
Table 6-1 opposite.
Abort
Aborts the selected communication reference.
Reject
Rejects an invalid command that has been sent to the ACS 600,
e.g. when the master attempts to use services that are not supported
by the selected communication reference.
FMA 1/2 Ident
Returns the identification data for PROFIBUS protocol layers 1 and 2.
With the NPBA-01, this service will return the following information:
Vendor: ABB INDUSTRY OY
Controller: NPBA-01
HW Release: HW1.00
SW Release: SW1.00
Status
Displays the status of the ACS 600.
Identify
Returns a general description of the slave. This command gives the
same result as reading PROFIBUS Parameter 964.
GetOD
Reads the
object dictionary from the drive in short form. The returned
three words are the requested index, object code, and data type and
length.
Read
Write
With these
command the master can read and write parameter values,
descriptions and PPOs.
