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06.91
3.5
Addressing lists
With the bus and the point-to-point connection, the header information of the message frames
is evaluated on the interface modules.
3.5.1
Addressing lists of the bus interface module
The network software, the AP monitor and the SINUMERIK driver evaluate and generate the
headers of the message frames (figure "Message frame processing using CP 231A"). The
information necessary for this purpose is stored in lists. These lists are on the interface
module and are configured correspondingly on start-up of the system.
Processing in input direction
The addressing data of plane 1 to 4 (Ethernet address, TSAP address) which are stored in the
network header of the incoming message frame are interpreted by the network software.
Based on the address, it passes the message frame via a corresponding interface to the AP
monitor.
The AP monitor analyses the entries in the AP header and transmits the message frames to
the appropriate interface of the SINUMERIK driver.
The information required by the AP monitor for interpretation of the AP header are listed in the
application relation table and function distribution table.
The SINUMERIK driver evaluates the SINUMERIK header (identification) of the SINUMERIK
message frame. It assigns a SINUMERIK internal coding (function number) to the header
information and determines the addressing data to be passed on within the SINUMERIK. The
SINUMERIK driver takes the necessary information from input list 1.
The SINUMERIK driver routes the message frame to the dual port RAM and there stores the
relevant addressing data which have been drawn from input list 1.
Using these address data, the message frame is passed on by the COM-CPU within the
SINUMERIK.
Processing in output direction
A message frame to be sent is first stored by the COM-CPU in the dual port RAM. The
system-internal addressing data belonging to the message frame are also stored by the COM-
CPU in the dual port RAM. The SINUMERIK driver is then notified via a control bit that a
message frame which is ready to be sent is waiting in the dual port RAM.
Then the SINUMERIK driver generates the SINUMERIK header for this message frame. It
takes the necessary information from output list 1. The SINUMERIK driver transfers the
message frame to the AP monitor.
The AP monitor generates the AP header for the message frame and allocates the message
frame to the required connection, i.e. the corresponding interface of the network software. The
necessary data and/or allocations takes the AP monitor from the application relation table and
function distribution table.
The network software receives the message frame to be sent from the AP monitor via a
specific interface and then generates the network header containing the network addressing
data (Ethernet address, TSAP address). Then it sends the message frame to the SINEC H1
bus.
© Siemens AG 1989 All Rights Reserved
SINUMERIK 840/880 (PJ)
6FC5 197-0AB20-0BP0
3 Interface Modules
3.5 Addressing lists
3–45
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