BECKHOFF CX1100-000x - Manual (Page 51)

Error handling and diagnostics
Embedded PC 49
....
IF k_bus_state = 1 THEN (* an error occured on K-Bus*)
k_bus_request := TRUE; (* request vaules for ErrCode and ErrArg *)
CASE k_bus_err_code OF
0 : return; (* should not happen, though an error occured *)
1 : CASE k_bus_arg OF
0 : report error; (* EEPROM checksum error *)
1 : report error; (* overflow in code buffer *)
2 : report error; (* unknown datatype *)
END_CASE;
2 : CASE k_bus_arg OF
0 : report error; (* programmed configuration, wrong table entry *)
ELSE report error; (* wrong table entry *)
END_CASE;
3 : report error (* K-Bus command error *)
4 : CASE k_bus_arg OF
0 : report error; (* break after power supply *)
ELSE report error; (* break after terminal 'k_bus_arg' *)
END_CASE;
5 : report error (* K-Bus-error during register-communication with
terminal 'k_bus_arg' *)
9 : CASE k_bus_arg OF
0 : report error; (* checksum error in program flash *)
ELSE report error; (* terminal 'k_bus_arg' does not exist in boot
configuration *)
END_CASE;
14 : report error (* 'k_bus_arg'-th terminal has wrong format *)
15 : report error (* wrong number of bus terminals *)
16 : report error (* length of K-Bus data is invalid *)
END_CASE
k_bus_request := TRUE; (* reset bus, if reason for error is removed, bus
starts again *)
....
To make the control work, the register and the program must be linked in System Manager. If the PLC program is
attached in System Manager the following signals are available: