Behavior Of Output Data; Parameter Handling Using Acyclic Parameter Access Mechanism (Dp-V1); Header And Frame Structures - ABB FSPS-21 User Manual

90 PROFINET IO – Communication protocol
OUT area STW1
Control word 1
IN area ZSW1
Status word 1
ST2
PZD1
OUT area STW1
Control word 1
IN area ZSW1
Status word 1
Note:
For the contents of the Control word, the Status word, references and actual values, see
chapter PROFINET IO – Communication profiles
￭

Behavior of output data

If
IOPS (PLC provider status)=Bad
Connection loss
After power-up
Parameter handling using acyclic parameter access
mechanism (DP-V1)
PROFINET IO offers record read and write services for the acyclic parameter access
mechanism. When the drive parameters or FSPS-21 parameters are accessed, the
corresponding slot, sub-slot and index are set, and a PROFIdrive DP-V1 message is placed
on the data block of the record read or write frame.
￭

Header and frame structures

PROFINET IO uses the DCE RPC (Distributed Computing Environment Remote Procedure
Call) protocol for acyclic read and write services. I/O controllers and supervisors take care
of formulating most of the request frames. However, it is possible that handling the
PROFIdrive request and response headers must be performed in the application logic. The
acyclic frame structure, headers and error codes are described further below.
Frames Dest ad-
dr.
Bytes 6
Dest addr. and Src addr. are the destination and the source of the communication
relationship. The addresses are in hexadecimal format, for example, 00-30-11-02-57-AD.
Ether type is 0x800 for non-real-time communication.
NSOLL_A
Speed set point A
NIST_A
Speed actual value A
PZD2...3
NSOLL_B
Speed set point B
NIST_B
Speed actual value B
Then
Output data retains last values
Output data retains last values
All output data is 0
Src addr. Ether IP UDP
type
6 2 28
PZD4
STW2
Control word 2
ZSW2
Status word 2
RPC NDR Read or
Write
80 20 64
Data
...