BECKHOFF CX1100-000x - Manual (Page 53)

Error handling and diagnostics
Embedded PC 51
ip_bus_err_code with ErrorCode
ip_bus_err_arg with ErrorArg
ip_bus_state with BusState
ip_bus_request with Request[0]
If all signals are linked the programmer can load configuration and PLC program onto the system.
Firmware > B7
With a new firmware release B7 it is easier to access the diagnosis values. The solution described above clears the
error code if the reason for the error is no longer present. With the firmware > B7 its possible to get the error codes
directly in the case of the error. To access the error codes the Bit 4 in GCB must be set to 1. So for diagnosis its a
good idea to set the bit in the initialization of error routine or PLC program. The bit must be linked to the bit 4 in GCB: