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ifm Programming Manual BasicDisplay CR0452 v03.02 05 / 2018
Safety instructions Start-up behaviour of the controller
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2.3 Start-up behaviour of the controller
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Danger due to unintentional and dangerous start of machine or plant sections!
► When creating the program, the programmer must ensure that no unintentional and dangerous
start of machines or plant sections after a fault (e.g. e-stop) and the following fault elimination can
occur!
Realise restart inhibit.
► In case of an error, set the outputs concerned to FALSE in the program!
A restart can, for example, be caused by:
• Voltage restoration after power failure
• Reset after the watchdog responded because the cycle time was too long
• Error elimination after an E-stop
To ensure safe controller behaviour:
► monitor the voltage supply in the application program.
► In case of an error switch off all relevant outputs in the application program.
► Additionally monitor actuators which can cause hazardous movements in the application program
(feedback).
► Monitor relay contacts which can cause hazardous movements in the application program
(feedback).
► If necessary, ensure that welded relay contacts in the application project cannot trigger or continue
hazardous movements.
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2.4 Notes: serial number
20780
► In the user's production facility, draw a diagram of the controller network in the machine. Enter the
serial number of each controller installed into the network diagram.
► Before downloading a software component, read out this serial number and check the network
diagram to make sure that you are accessing the right controller.
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