Diagnostics with the CP 341
8.1 Diagnostics Functions of the CP 341
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
204
Manual, 09/2008, A5E02191071-01
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
1st Byte
3rd Byte
4th Byte
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
Wire break
0 0 1 0 0 1 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
Incorrect parameter
1 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Diagnostic information (hexadecimal)
The table below shows the 4 bytes of diagnostic data of the CP 341 in hexadecimal notation.
Event
1st Byte
2nd Byte
3rd Byte
4th Byte
Wire break
25H
0CH
02H
00H
Incorrect parameter
83H
0CH
00H
00H
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.
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