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SPC3
PROFIBUS Interface Center
12 Sample Program
12.1 Overview
The sample program shows the utilization of the DPS2 software with the following examples:
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•
•
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The received output data is filed in a defined memory area (io_byte_ptr).
As input data, this memory area is read back or mirrored.
The first byte of this input data influences the diagnostics bits in the manner already described.
The sample slave has a switched on configuration of 0x13 / 0x23 (that is, 4 bytes I/Q) and can
adapt
itself to a configuration of 0x11/0x21 that is, 2 bytes I/Q). Based on your
application, you must decide
the extent to which a configuration change is a good idea
• If 0xAA and 0xAA is in the user-specific parameter data, the sample program will signal
a faulty parameter assignment. The user-specific parameter data is copied to the
diagnostics
data
field.
You can insert your application to the interfaces described. The program modules to be processed are
summarized in the user directory. You particularly have to determine and enter the station address via your
mechanism (for example, rotary switch, keys, etc.). You can obtain your own device-/manufacturer-specific
PNO ident number from the PNO (refer to address list). You can include your own interrupt programs,
dependent on the application, in the interrupt routines provided in the source code.
Sample batch files, command files etc. are included in the diskette directory for generating operational
EPROMs.
The current state is stored on the delivery diskette. Please heed the current implementation instructions in
the interface center’s mailbox (++49 911 73 79 72).
SPC3 User Description
Copyright (C) Siemens AG 2002. All rights reserved.
V2.0
Page 87
09/02