Fig. 102: Timing diagram for SF_ModeSelector, reset of error condition
The FB detects whether none of the mode inputs is selected. This invalid condition is detected after ModeM-
onitorTime has elapsed:
n
Which restarts with each falling trigger of an S_ModeX switched mode input
n
Which is then in the ModeChanged state following activation of the FB
In contrast, the FB directly detects whether more than one S_ModeX mode input is selected at the same
time.
A static reset condition is detected when the FB is either in Error state C001 or C002.
Error Behavior
In the event of an error, the S_ModeXSel and S_AnyModeSel outputs are set to safe state = FALSE. The
DiagCode output indicates the relevant error code and the Error output is set to TRUE.
An error must be acknowledged with the rising trigger of the Reset BOOL input. The FB changes from an
error state to the ModeChanged state.
Configuration and programming
AC500-S Libraries > SafetyBlocks_PLCopen_AC500_v22.lib
30.03.2017
AC500-S
285
