BECKHOFF C1220 - Manual (Page 11)

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11 Software description of functions
Beckhoff Lightbus - PC interface card C1220
A function request is composed of a length entry, a function number and
the function arguments. The length entry refers to the number of following
bytes:
Byte ’Length’ + Byte ’Function number’ + Number of Bytes ’Argument
0’ to ’Argument n’
Test and analysis functions
Fibre-optic reset
The fibre-optic ring can be reinitialized by means of this function. Within the
scope of initialization, the number of modules in the ring is defined, the
module addresses are distributed and tested and the ring is checked with
regard to its attenuation reserve. Any existing fracture point is also
detected and located.
Argument Channel Length Function
0 1 2
Comment
Request 02 0x01
Reply 05 0x01 00 00 nn Function correctly executed
(nn modules in the fibre-optic ring)
05 0x01 01 01 00 Maximum number of send repetitions
exceeded
05 0x01 01 02 00 No address setting possible
05 0x01 0a 01 nn Fracture point before nn-th module
before the receiver input of the C1220
05 0x01 0a 01 ff Fracture point cannot be located
(Fracture point before receiver input)
05 0x01 07 01 nn Test addresses:
Address error (module nn)
05 0x01 05 02 00 Attenuation test:
Error with high intensity
05 0x01 05 03 nn Attenuation test:
Switch error with low intensity
(module nn)
05 0x01 05 04 nn Attenuation test:
Error with data pattern 1
(pattern 00)(module nn)
05 0x01 05 05 nn Attenuation test
Error with data pattern 2
(pattern FF) (module nn)
05 0x01 05 06 nn Attenuation test :
Error with data pattern 3
(pattern AA) (module nn)
05 0x01 05 07 nn Attenuation test :
Switch error with high intensity
(module nn)
The number of modules in the ring is communicated if the ring is initialized
without errors. If an error should have occurred, the error type (see table)
and the module address where the error occurred are returned.