I would like to ask: PLC output sub-relay output and thyristor output, what is the difference.I only control the general digital signal, what type should be selected?
So if you want to high-speed response or need to be smaller, select the transistor unit, if you need a relatively large current on the selection of the relay unit.
Generally no special requirements, select the relay unit, wiring and measurement are very convenient, because there is no volume limit so are the terminal block, but the same number of points much larger.
Input and output relay is the switch, and the transistor is analog!
The switch is in the form of a switch, and the size of the input and output is independent of the switch. Carrying capacity is relatively strong. May drive loads such as relays!
While the analog some of the signal amplification, and some of the A / D conversion. It can drive signals such as 1-10V, 4-20mA,
Input and output search with relays, transistors and other isolation are the amount of switch, the relay is provided by the dry contact, can be used to control the alternating current (small current). Transistor output is used to drive the amount of DC, mostly relays, solenoid valves and so on.
Transistor unit integration is high, the same number of points smaller, faster response, but the current is small.
The key question depends on what kind of control is your load required
1, the relay output can be used for DC, AC control of the switch control due to the total number of life
So the output frequency is too high too high the total number of life will soon finish 100,000 times as the total number of technological progress may be higher
2, the transistor is generally used for occasions with fast frequency changes for DC power on and off control
High frequency must be transistor output
And can not be followed by contact type of intermediate relay
