Qbus uses the same I/O for input as for output.
Toggle is the option called "on/off". Pressing it once switches the I/O on, pressing it again switches it off.
This I/O can be used on switches, input modules, displays, relais modules, ...
When 'Delay on' is used the led on the button immediately turns on, but when the I/O is used on a relay module , the output is activated after the delay.
When 'Delay off' is used the led on the button immediately turns off, but when the I/O is used on a relay module , the output is deactivated after the delay.
Also look at 'Common I/O parameters'