BECKHOFF C1220 - Manual (Page 14)

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Software description of functions 14
Beckhoff Lightbus - PC interface card C1220
Count peripheral modules
The number of modules in the ring can be defined with this function.
Argument Channel Length Function
0 1 2
Comment
Request 02 0x06
Reply 04 0x06 00 nn Count modules:
nn modules in the ring
04 0x06 01 00 Count modules:
Ring interrupted
Test peripheral module addresses
By means of this function, a check is made as to whether the modules are
still keeping to the addresses they received on initialization.
Argument Channel Length Function
0 1 2
Comment
Request 02 0x07
Reply 04 0x07 00 00 Addresses correct
04 0x07 01 nn Error at address nn
To guarantee maximum operating reliability, during normal operation this
function can also be run cyclically in the background. In doing so, the
function is activated by setting a bit in the GCB. In the event of an error, a
message is sent to the PC via the GCB.
Continuous sending
The continuous sending function only controls the ’Cycle’ LEDs on the
modules to determine how many modules are still connected to the
transwhere output of the C1220. This function should only be activated if
the 0x0a (Fracture point test) does not return a satisfactory result. On the
software end, continuous sending can only be stopped by a RESET.
Argument Channel Length Function
0 1 2
Comment
Request 02 0x08
Reply 03 0x08 01 Continuous sending can be stopped by
RESET