The difference between photoelectric switch transistor output and relay output

1. Service life Relays are mechanical components, so they have service life. Transistors are electronic components, only aging, and there is no limit to the number of times they can be used.

2. Current transistor current 0.2a-0.3a, relay 2a.

3. The voltage transistor is 24V, the relay can be connected to 220V, the transistor is connected to DC, and the relay is AC+DC.

4. Load When transistors are used, other things are sometimes added to drive heavy loads (such as relays, solid state relays, etc.).

5. The principle of the response speed relay output mode is that the CPU drives the relay coil to make the contacts absorb, and the external power source drives the external load through the closed contacts. The open circuit leakage current is zero, and the response time is slow (about 10ms).