7BCOMMUNICATION IN SIMATIC S7
8.7 Peripheral area for SFC, SFB, FB communication
In simple applications where only the weight values and status information is to be
read, the user can access the peripheral address of the SIWAREX module directly.
The following table shows the assignment of the peripheral area when
communication to "SFC, SFB, FB" is selected in the HW config. Byte "0"
corresponds to the address of the SIWAREX U module in the HW config.
Table 8-1 Allocation of the peripheral area
8.8 Peripheral area for I/O communication
Communication via the peripheral area can be used when "I/O" communication has
been selected in the HW config for the communication with external systems when
using the peripheral system ET200 M.
The details are described in a separate chapter (see Chapter 9 Communication
with other systems ).
Byte
S7 output area S7 input area
Channel 1
0 Not used BYTE cyclic counter
1 Not used BYTE status
2 Not used
3 Not used
INT gross weight
4 Not used
5 Not used
WORD digital value from the
ADC
6 Not used
7 Not used
WORD operating faults -
asynchronous errors
Channel 2
8 Not used BYTE cyclic counter
9 Not used BYTE status
10 Not used
11 Not used
INT gross weight
12 Not used
13 Not used
WORD digital value from the
ADC
14 Not used
15 Not used
WORD operating faults -
asynchronous errors
SIWAREX U 8-57
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