Beckhoff CX1100-000x Bedienungsanleitung PDF herunterladen (Seite 50)

Error handling and diagnostics

48 Embedded PC

5. Error handling and diagnostics

Terminal Bus Analysis in PLC-Program

To analyze the terminal bus (K-Bus and IP-Link) the programmer can access the registers described in the

architecture. The access to the PLC-program is realzed via TwinCAT. To have the access to the necessary registers

the extended DPRAM model has to be activated (only in Firmware > B3). The registers are described in the

architecture of the terminal bus connectors.

Though the handling is identical for both sub busses the explaination is done generally.

For analysis four signals / variables are used:

 BusState (describes the state of the bus: 0 -> no error, 1 -> bus error)

 ErrorCode (same error code as the LED blink code)

 ErrorArg (same argument code LED blink code)

 Request[0] (output to request error codes / reset bus)

In the PLC program some external variables must be defined:

VAR

k_bus_request AT %QX0.0 : BOOL;

k_bus_err_code AT %IB0 : USINT;

k_bus_err_arg AT %IB1 : USINT;

k_bus_state AT %IB2 : USINT;

ip_bus_request AT %QX0.1 : BOOL;

ip_bus_err_code AT %IB3 : USINT;

ip_bus_err_arg AT %IB4 : USINT;

ip_bus_state AT %IB5 : USINT;

END_VAR

In the PLC program the analysis can be done as follows: (this is only pseudo code)

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Beckhoff CX1100-000x Bedienungsanleitung Seite 50