The output of the PLC module circuit

Output module of the power amplifier has driven dc load of high-power and field effect transistor, the bidirectional thyristor drive ac load, and can be driven dc drive ac load and load of small relays. Output current of the typical value is 0. 3 ~ 2 a, the load power is provided by external field. Figure 2 - 5 is relay output circuit. The internal circuit of relay coil electricity, it normally open contact closure, the external load to work. Relay isolation and power amplification effect at the same time, every only provide users with a normally open contact all the way. With RC circuit in parallel and varistor is used to eliminate the chariot when off contact arc, in order to reduce its disturbance to the CPU. Figure 2. 6 is the transistor collector output circuit. 。 The output signal to the internal circuit of the output latch, then through optical coupler to output transistor, the saturated conductivity and globe state is equivalent to contact on and off. Figure of regulated work to curb turn-off overvoltage and external surge voltage, in order to protect the transistor, the transistor output circuit delay time & lt; 1ms。 The field effect tube output circuit structure is basically the same with the transistor output circuit. In addition to the above several kinds of output circuit, and the bidirectional thyristor output circuit, it through photoelectrical thyristor isolation. Bidirectional thyristor by shut off into conduction delay time is less than 1 ms, by conduction to shut off the delay time of less than 10 ms. Thyristor to spend hours in load current conduction, can meet with this kind of situation on both ends of the load in parallel resistor. In addition to the input module and output module, and a kind of both input circuit and output circuit module, input and output points, generally the same, this module allows the user to determine the PLC controller hardware configuration is more convenient. Output current rating is related to the nature of the load, for example, the FX relay output module can drive 2 a / 220 v AC resistive load, but can only drive 80 va / 220 v AC inductive load and 100 w bulb. Rated output current is also related to the temperature, the temperature rise at rated output current is reduced, some PLC controller provides the related curve. Due to the heat dissipation, and some output module need to be considered belong to the same common point ( COM) A few dots of the total current, such as rated output current of the transistor output module of FX is 0. 5 a/points, 0. 8A/COM。 The use of relay output module voltage range is wide, conduction voltage drop is small, strong ability to withstand transient overvoltage and overcurrent, but slower, life ( Number of action) A certain limit. If the load on and off of the change is not very frequent, preferred with relay type. Type transistor and the bidirectional thyristor module used for dc load and ac load respectively, their high reliability, fast response, long life, but the overload capacity is a bit poor.
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