BECKHOFF C1220 - Manual (Page 27)

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27 Software description of functions
Beckhoff Lightbus - PC interface card C1220
C1220 II/O Error Counter
The C1220 has several counters to register II/O problems. The counters
are stored in the DPRAM from offset 0xEE0, as 16-bit values. There is no
overflow processing, and no erasure of the counters by the C1220.
The counter which registers the errors of the internal address check
(0xEEA) is designed as an 8-bit counter, and does not increment the total
error.
DPRAM-Offset Meaning Function
0xEE0 Total error Delivers the number of error handing operations as the sum total of
the individual error triggers (following)
0xEE2 Error in receiver 1 Address and/or control unequal to transmitted bytes
0xEE4 Error in receiver 2 Address and/or control unequal to transmitted bytes
0xEE6 Timeout error Timeout in telegram reception
0xEE8 Parity error Telegram received with CRC error
-------------------- ----------------------------- --------------------------------------------------------------------------------------
0xEEA Error in internal address
check When this counter is incremented an address check and count
telegram with logically false content ( AD <> D3 ) is received.
0xEEC Module address in case
of internal address
check error If bit 1 is set in the C1220 error mask, this cell contains the module
address of the box which caused the error.