error when using subcircuit

[Tonyf60]

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I have created a subcircuit with the aim of simulating a TON timer (IEC PLC-Programming, see image). Unfortunately, I cannot use the subcircuit because an error message appears when starting:

This is what the circuit looks like, which works as a subcircuit and does exactly what it is supposed to. The button is only there for testing. I don't need the input for T. But I hade to give the clock signal a name. I have already tested with an external clock signal. Same error.

[hneemann]

It seems to me that the clock "T" is not connected.

[Tonyf60]

Ok, the error does not appear now. But this means, that a clock-signal can not be used in an subcircuit. I have to add it from outside.

[hneemann]

Yes! If the clock is used within a sub-circuit, it behaves like a normal input.