The first step is to specify absolutely all of the functions that the system must perform:
What signals?
Light and sound?
How activated?
When activated?
The more detail you can give, the easier the design process.
ken
Opto-couplers are "generally" designed to transfer and isolate lower power signals.
SSR's are "generally" designed to allow lower power signals to be isolated from, and switch high power devices.
Ken
Have you looked at the datasheet?
Absolute Maximum Ratings:
Switch I/O Voltage (VIO) VEE -0.5 to VCC +0.5V
Clamp Diode Current (IIK, IOK) ±20 mA
This will not work as an analog switch for 24VDC analog signals.
Ken