NC contact of 27 relay

[odlanor]

by convention, relays in elementary diagram represents contatcs position with not-energized coil. So,
27-eletromechanical relay is represented by NC contact in the elementary diagram

27-digital relay needs a DC source to be ready for operation.
Without DC source relay contact is Normally Open(NO).
With DC source NC contact will be avaiable.

Question: How to represents 27 digital contact in-elementary diagram? (NC or NO ?)

 

[dpc]

We show it as N.O.(off-the-shelf), but we always provide a description of the contact operation (for ALL output contacts) in a legend on each drawings.