10 SCAN
DEUTSCH ENGLISCH FRANZÖSISCH ITALIENISCH SPANISCH
The entire memory area of the PLC is availabe to the user program, with the exception
of the variable memory VB0 ... VB50 and the marker bit M0.0.
3.7 Contamination and Error Signal Output
This pnp output normally carries +24V DC. In case of a weak receiver signal caused by
contamination or misalignment, or in case of a fault, this output is switched to high
resistance. The output is short-circuit-proof and can carry up to 70 mA.
Fig. 4: Software module for data acceptance by the Siemens Simatic S7/200
port 0
interrupt-
routine 0
determine length
of data packet
interrupt-
routine 1
user
program
subprogram
0
initialization
data buffer
header
usable
data
CRC
VB16
VB20
read access write access
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