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3 Interface Modules
3.5.2 Addressing lists of the serial interface module
3.5.2.2 For message frames without AS 512 protocol and
with identification
Processing in input direction
After error-free reception of the message frame, the procedure driver transfers the message
frame data to the device management (no protocol header is available).
The device management interprets the entries with the aid of the interface and addressing list
and transmits the message frame to the SINUMERIK driver.
The SINUMERIK driver evaluates the SINUMERIK header (identification) with the aid of input
list 1. It enters the message frame data and the corresponding address data in the dual port
RAM. The COM area fetches this data and passes it on.
Processing in output direction
The SINUMERIK driver calls a message frame stored by the COM area in the dual port RAM.
The SINUMERIK driver generates the SINUMERIK header with the aid of output list 1. Then it
passes the message frame on to the device management.
The device management evaluates the entries with the aid of the information from the interface
and addressing list and passes the message frame on to the procedure driver.
The procedure driver transmits the data to the connected station.
3.5.2.3 For message frames with AS 512 protocol and
without identification
Processing in input direction
After error-free reception of the message frame, the procedure driver transfers the protocol
header and the message frame data (exclusively useful data without identification and error
number) to the device management.
The device management interprets the AS 512 header and evaluates the entries with the aid of
the interface and addressing list. Then it passes the useful data on to the SINUMERIK driver.
The SINUMERIK driver checks the message frame data length and the status of the interface
(reserved/free) and enters the data into the dual port RAM where they are routed by the COM
area to the multi-port RAM and then by the PLC software to the user interface.
Processing in output direction
The SINUMERIK driver fetches a message frame to be transmitted from the dual-port RAM. It
checks the message frame data length and the status of the interface before passing the
message frame on to device management.
The device management generates the AS 512 header with the aid of the interface and
addressing list and transmits the message frame to the procedure driver, which makes sure
that the data is properly transmitted to the connected station.
3–48
© Siemens AG 1989 All Rights Reserved
06.91
6FC5 197-0AB20-0BP0
SINUMERIK 840/880 (PJ)
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