BECKHOFF C1220 - Manual (Page 13)

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13 Software description of functions
Beckhoff Lightbus - PC interface card C1220
Fibre-optic attenuation test
The attenuation reserve of the fibre-optic ring can be tested with this
function. In this test, all leaks of the fibre-optic ring are partially operated
with approximately 80% of the normal transmission intensity and extreme
test telegrams. This test can be run for all modules or for only one selected
module (see table). The C1220 can be tested separately via the module
address 0.
The table shows the function requests and the possible
acknowledgements.
Argument Channel Length Function
0 1 2
Comment
Request 04 0x05 00 00 Test all modules
04 0x05 01 nn Test module nn
Reply 04 0x05 00 00 Ring has adequate attenuation reserve
04 0x05 02 00 Error with high intensity
04 0x05 03 nn Switch error with low intensity (module nn)
04 0x05 04 nn Error with data pattern 1
(pattern 00)(module nn)
04 0x05 05 nn Error with data pattern 2
(pattern FF)(module nn)
04 0x05 06 nn Error with data pattern 3
(Pattern AA)(module nn)
04 0x05 07 nn Switch error with high intensity (module nn)
04 0x05 09 00 Continuous sending function active
"Error with high intensity" means that the ring already has an excessive
attenuation during normal operation or that there may be a fracture point.
"Switch error with low intensity" means that the transwhere intensity of the
module concerned cannot be reduced.
"Error with data pattern xx" indicates that the fibre-optic ring after the
specified module has an excessive attenuation. It is nevertheless possible
to operate the system, with the result that this malfunction can be remedied
at a suitable point in time.
"Switch error with high intensity" means that the specified module can no
longer be switched back to the full transwhere power.