Sigma C4 manual Program Run Time Information/Considerations

6.7.1 Program Run Time Information/Considerations

When a program is running, the display shows the currently executing program step number on the left and the total amount of remaining run time for that step on the right. The time displayed is the sum of any remaining ramp time and/or hold time. The temperature may be displayed by pressing <DISP/TEMP> while the program is running. Pressing <DISP/CNTL> will restore the display of the current step number and the time left in the step.

Programs may be designed to run continuously by specifying the next step to be any previous step of the program. In this way, step 100, the end, is never reached. The program must then be stopped by the operator pressing the <START/STOP> key. Controlled looping is also possible. See 6.8.1.

Multiple programs may be stored in memory since a program may be started from any step and terminates with any step specifying 100 as its next program step. It is the operator's responsibility to keep a record of the beginning program step number for each program in memory.

6.7.2 Run Time Pre-read Errors

When a program is started by pressing <START/STOP> with the first step of the program displayed, the C4 will pre-read all the program’s steps in the run time execution sequence. During the pre-read, the C4 checks all steps for errors so that the user can solve any problems immediately rather than having them occur later, during program execution. The pre-read makes certain that the program to be run does not call for probe 2 use when only one probe is defined by setup parameter F1, that all loop commands contain valid loop counters, and that all setpoints requested are within the System Operating Range. In each case, if an error is found, the display will show the step number that contains the error on the left side of the display, and the error message on the right side.

Note that the pre-read will display the first error is finds. If there is more than one error, each successive error will be shown on the display after the last displayed error is corrected and a program start is again attempted.

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