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Programmable Logic Controllers (PLCs) come with three types of output options: relay output, transistor output, and thyristor (also known as SCR) output. When working on a PLC, it's essential to consider the power requirements of the connected loads. According to the main technical specifications of PLC outputs:

  • The thyristor output is only suitable for AC loads.
  • The transistor output is designed for DC loads only.
  • The relay output can handle both AC and DC loads.

If the load’s rated current or power exceeds the interface specifications, it’s necessary to use an external contactor or relay to connect to a high-power supply. This ensures safe and efficient operation without damaging the PLC or the connected devices.

Relay output PLCs support both DC and AC power supplies. They allow connecting power sources of the same type and voltage to the same COM terminal. However, during maintenance, it's crucial not to connect different power sources to the same COM terminal. If the power sources are identical, the COM terminals can be safely connected together.

The response time of the PLC is typically 0.2 ms. At a condition of 24V and 200 mA, the actual time required is when the circuit cuts off the load current completely. To improve the response time, a parallel current-saving diode can be used. If a response time of less than 0.5 ms is needed, the power supply should be set to 24V at 60 mA.

Figure 2 shows the wiring diagram for hybrid control of AC and DC equipment using a relay output. Figure 3 illustrates the relay transition when a transistor output is used to control an AC device or a high-power device in the control area.

Understanding the differences between these output types is key to ensuring proper system design and troubleshooting. Always refer to the manufacturer’s specifications and ensure compatibility between the PLC and the connected loads to avoid damage and ensure reliable performance.

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