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Home >> ABB >> ABB CI855K01 3BSE018106R1 Fieldbus communication interface

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ABB CI855K01 3BSE018106R1 Fieldbus communication interface

Inserting a D-PS or D-PS/RED resource

Select target position of new process station

→ insert over

a new process station can be inserted over the selected object

→ Insert under

a new process station can be inserted under the selected object

→ Insert next level

a new process station can be inserted one level deeper

The target position can be located at the next level below the configuration

element or (only in the case of next level insertion) on the configuration itself.

→ on target position and press left mouse button → OK

3.2 Inserting a task or redundant task

In the process station the actual programs run into the task. The programs are edited either using

Instruction Lists or Sequential Function Chart.

A redundant task has so-called redundancy data. These are data of the process image and of the

function blocks for which a data adjustment is performed after each cycle. This ensures that a re dundancy toggle can take place at any point in time.

So that the data of a redundant task are redundancy-capable, all variables of a redundant task

must be written in process image mode.

Not only the redundant task (TASK/RED), but also tasks of the previous type (TASK) can be con figured under the redundant resources. Thus only those functions of the user program which also

actually have to be redundant need to be configured redundantly within a redundant resource.

4 Processing and failure action

4.1 Automatic error handling at task level

Error handling at task level is described in the flow chart (page 39).

When an error is identified in a user program, an error task is executed once. The error- task is

the highest priority task (priority 100) of a resource and is used to handle errors in user programs

by user programs. In the case of non-recoverable errors, the error-generating task changes to the

unrunnable state; in the case of recoverable errors it is possible to continue running the error generating task, provided the automatic error correction for the D-PS resource is switched on.

Owing to its high priority it cannot be interrupted by other tasks. Execution of the error task can be

suppressed.

Error handling at task level is switched on by default but can be deactivated in the resource con figuration (see Engineering Manual, System Configuration, Project tree). When deactivated,

an error causes the task to change to the unrunnable state, even if the error is recoverable. The

error appears in text form in the task header and the object number of the faulty project object is

also displayed.

If automatic error handling is active and a recoverable error is detected, the affected task remains

in the running state. In this case, the error condition is ascertainable only by evaluation of the

system variables.

Each runtime error detected during execution of a command results in an entry recording the

cause and location of the error in system variables specially predefined for error handling. The

cause of the error, e.g. 4 for UINT div. by 0, is saved in the variable “ErrorNo”. The variable “Er rorProgra” is written with the object number of the program or function block that caused the error.

Furthermore, the object number of the affected task is saved in the variable “ErrorTask,” but only

displayed in the task header if error handling is deactivated. The affected object can then be lo calized in the object list with its name, state, type and position in the project tree. If the affected

task, the one which triggered the error, is not the error-handling task, the error-handling task itself

is now triggered. Error handling specific to the cause of the error and/or its location can be un dertaken in this task, with the aid of the system variables.

If an error should occur in the error-handling task itself, the error-handing task is signaled as un runnable.

See also Engineering Manual, IEC 61131-3 Programming, Variables, System Variables.

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