X20(c)SC2212
Data sheet V1.141 X20(c)SC2212 Translation of the original documentation
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15 Restart behavior
Each digital input channel is not equipped with an internal restart interlock, which means that the associated channel
data reverts back to the proper state automatically after an error situation on the module and/or network.
It is the responsibility of the user to connect the channel data of the safe input channels correctly and to provide
them with a restart interlock. The restart interlocks of PLCopen function blocks can be used here, for example.
Using input channels without a correctly connected restart interlock can result in an automatic restart.
Each output channel is equipped with an internal restart interlock, which means that the following sequence must
be followed in order to switch on a channel after an error situation on the module/network and/or after ending the
safety function:
•
Correct all module, channel or communication errors.
•
Enable the safety-related signal for this channel (SafeOutput, etc.).
•
Pause to ensure that the safety-related signal has been processed on the module (min. 1 network cycle).
•
Positive edge on the release channel
For switching the release signal, the notes for manual reset function in EN ISO 13849-1:2015 must be observed.
The restart interlock functions independently of the enabling principle, which means that the behavior described
above is not influenced by the parameter settings for the enabling principle or by the chronological position of the
functional switching signal.
An automatic restart of the module can be configured by setting parameters. With this function, the output channel
can be enabled using safety technology without an additional signal edge on the release channel. This function
remains active as long as the release signal is TRUE and there is no error situation on the module/network.
Regardless of this parameter, a positive edge is required on the release channel for enabling the output channel
in the following situations:
•
After switching on
•
After correcting an error on the safe communication channel
•
After correcting a channel error
•
After the release signal drops out
The automatic restart is configured in SafeDESIGNER using the channel parameters. If using an automatic restart,
note the information in EN ISO 13849-1:2015.
Danger!
Configuring an automatic restart can result in critical safety conditions. Take additional measures to
ensure proper safety-related functionality.