Siemens SIMATIC S7 System Manual page 391

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Example 3 - If an error has occurred during task execution

The task is started with a positive edge at the input parameter "JogForward" or "JogBackward".

While the task is active, the output parameter "Busy" indicates the value TRUE.

An error occurred during task execution. When the error occurs, the output parameter "Busy" changes to FALSE and

"Error" to TRUE.

When the input parameter "JogForward" or "JogBackward" is reset to the value FALSE, the output parameter "Error"

changes its value to FALSE.

An error occurrence is indicated in the output parameter "Error" for only one execution cycle,

if all the conditions below are met:

The input parameters "JogForward" and "JogBackward" have the value FALSE (but the axis

is still decelerating) and a new error occurs (software limit switch is approached, for

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

102BTechnology instructions

9.3 Basic motion control

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Simatic s7-1200