Siemens Simatic S7-300 CP 341 User Manual page 204

Diagnostics with the CP 341
8.1 Diagnostics Functions of the CP 341
1st, 3rd, and 4th bytes:
The 1st, 3rd, and 4th bytes of the diagnostic data represent the error that has occurred.
Bit 0 in the 1st byte is the group error display (SF). Bit 0 is always set to "1" if at least one bit
from bits 1 to 7 is set to "1", i.e. if at least one error is entered in the diagnostic data.
Event
7
Wire break 0
Incorrect parameter 1
Diagnostic information (hexadecimal)
The table below shows the 4 bytes of diagnostic data of the CP 341 in hexadecimal notation.
Event
Wire break
Incorrect parameter
Relationship of the diagnostic interrupt and the CPU operating mode
A diagnostic interrupt is generated via the I/O bus on an incoming event (rising edge) and
outgoing event (falling edge).
When the CPU switches from STOP to RUN mode, the following applies:
● Events (either incoming or outgoing) that occurred when the CPU was in STOP mode are
not stored
● Events that are still present when the CPU switches back to RUN mode are signaled via
a diagnostic interrupt.
204
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1st Byte
6 5 4 3 2 1 0
0 1 0 0 1 0 1
0 0 0 0 0 1 1
1st Byte 2nd Byte
25H
83H
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
3rd Byte
7 6 5 4 3 2 1
0 0 0 0 0 0 1
0 0 0 0 0 0 0
3rd Byte
0CH 02H
0CH 00H
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4th Byte
0 7 6 5 4 3 2
0 0 0 0 0 0 0
0 0 0 0 0 0 0
4th Byte
00H
00H
Manual, 09/2008, A5E02191071-01
1 0
0 0
0 0