How to select PLC switch output modules?

Output module is PLC controller internal low voltage signal is converted to the external output device needed to drive signal. Main load voltage should be considered when choosing the type and size, system to the requirements of delay time, load state whether changes frequently and so on. The choice of the ways of the output switch output module has three output modes: relay output, thyristor output and the transistor output. Relay output price cheaper and can be used to drive ac load, and can be used in the dc load, and wide applicable voltage size, conduction voltage drop is small, at the same time to have a better ability to withstand transient overvoltage and overcurrent. But it belongs to a contact element, the action is slow, short service life and reliability is poorer, therefore, can only be applied to not frequent on and off. When used to drive the perceptual load, the contact action frequency of no more than 1 hz. For frequent on and off load, should choose the bidirectional thyristor output or output transistor, they belong to the non-contact components. But the bidirectional thyristor output can only be used for ac load, and the transistor output can only be used for dc load. Output connection mode selection by PLC output connection mode is different, generally have grouped output and output two separated type, as shown in figure 5 - 16. Grouping type output is several dots as a group, sharing a common, between groups are separated, can use different power supply. And dividing the output of each output point has a public side, the isolation between each output point, each output point can be use different power supply. According to system load power supply kinds of main would. General integral PLC both packet type output, and dividing the output. The selection of the output current output module output current ( The drive ability) Must be greater than the rated current of the load. Users should choose according to the size of the actual load current module output current. If the actual load current is larger, the output module can't direct drive, can increase the amplification in the middle. At the same time, through to the number of dots choosing output module, can through to the number of dots at the same time should also be considered. At the same time, through to the output of the total current value must be smaller than public allowed through by the current value. Such as a 220 v / 2 a output module, at 8 o 'clock each output point can be through the current 2 a, but not allowed by the current output common 16 a ( 8X2） Usually much smaller than this value. In general, at the same time, through to the points of not more than 60% of the same output public points. Output the maximum load current and load type, the relationship between environmental factors such as temperature table 1 as the output of the FX series PLC technology index, it is closely related to the different load. In addition, the bidirectional thyristor's maximum output current temperature decreases with the environment, should also pay attention to in the practical use. Table 1 series FX2 PLC output specifications
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