and 8: 1 Introduction 1.1 Overview On a Va.

and 6: 5 DPL Toolkit 5-1 5.1 Overview of t.

and 4: General information The manufacture.

and 2: User Guide MD29 Microprocessor card.

Example DO WHILE LOOP Procedure 1 False (No) Condition True (Yes) Example of a DO WHILE, LOOP flow diagram MD29 Issue code: 29nu4 DPL Programming 4-13 True (Yes) Condition False (No) Procedure 1 Procedure 2 Example of an IF, THEN flow diagram Loop instructions A loop instruction repeats a block of instructions until a specified condition occurs. A conditional instruction performs an operation according to a set condition (eg. Example NOTES 4-12 DPL Programming MD29 Issue code: 29nu4Ĥ.7 Instructions and functions Conditional instructions This section describes the different types of instructions which are used in DPL programming. The writer of the program uses the NOTES task to help the user of the Drive understand the program. NOTES task This is a pseudo task that is ignored by the compiler. For further information, see Advanced error-handling in Chapter 9 Diagnostics.

The instructions in the ERROR task can determine the cause of the run-time error and take necessary action, such as stopping the drive system in a controlled manner. 3 The number of the error is placed in parameter #88.01 of the MD29 4 The ERROR task is executed. See the Trip enable parameters in MD29 setup parameters in Chapter 10 Parameters. 2 The Drive is tripped (if the trip is enabled). The sequence when a runtime error occurs is then: 1 All tasks are stopped. If this is undesirable, the ERROR task can be used.

Normally, the MD29 halts all tasks, and optionally trips the Drive. For example, an error signifying a serial communications loss could occur if incoming data from an I/O Box is lost due to the cable being broken. For example: Attempting to write to a read-only parameter A real-time task over-running Errors are usually due to programming errors, but can sometimes occur due to external influences. Run-time errors can be caused by a variety of occurrences.

If the DPL Toolkit is connected to the MD29 at the time of the error, the error number will be displayed on the screen. ERROR task The ERROR task is executed only when a run-time error has occurred in the DPL program. Refer to Timer/Counter Unit in Chapter 8 Features for further information.

All other tasks give way to the EVENT task. The EVENT task has the highest priority when the program is running. The source of the event is determined by the Timer/Counter Unit. EVENT task The EVENT task runs when a specific event occurs.

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