Festo CTEU-DN Description, Functions And Maintenance page 110

A. Technical appendix
A-12
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DIL switch settings:
– OFF = reset (factory setting)
– ON = Hold last state
Fig. A/3: DIL switches for Fail state function
The DIL switch setting applies for all outputs.
Further information relating to the DIL switches on the bus
node can be found in Part I of the product documentation
entitled "Installation and Interface manual", which is supplied
with the bus node.
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Festo P.BE-CTEU-DN-OP+MAINT-EN en 1206NH