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I was connecting some external relay module boards to the output terminals of a PLC system. This output module was a DC 24 volt output, and the relay boards had rated a coil voltage of 24 volts as well—not an unusual scenario. Figure 1. PLC I/O modules are flexible but can have many hidden surprises when connected to various load devices.

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One key aspect of PLC functionality lies in its output types, which determine how the controller interfaces with external devices. This article will explore the three primary PLC output types: Relay Output, Transistor Output, and Silicon Controlled Rectifier (SCR) Output. The relay output type involves the CPU driving relay coils, causing the.

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A transistor output can switch max. 0.3A, a relais output can switch up to 10A. That's the biggest difference. So you can say you use transistor output for small loads 24V (or 12) and you use relais outputs for heavy loads or loads wich must be swiched potential free. you can have a look at the logo Manual. For more technical details.

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Digital Outputs in PLC. Here, we will consider the various types of digital outputs in the PLC. Before going into the types, let us consider how an output functions in a PLC. A digital output is nothing but a switch that a PLC operates to turn on or off the output device. It is controlled by the logic written inside the PLC. Types of Contacts

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One advantage of this output type is that the PLC uses optoisolation to switch the transistor: hence isolating the PLC from the output's electrical source. Triac Output. The triac is also a solid-state device that is an equivalent of two "mirrored" transistors (specifically, the bipolar junction transistor). Because the current can now.

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There are several types of solid state outputs available with PLC's. Three popular types are transistor, triac and TTL. All three of these output units will generally have a common terminal although triac output units are available in an isolated configuration.

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The PLC programme will run and dependent on what inputs and the state of the PLC it will decide on what outputs to perform/close the contacts. There are two main types of outputs - relay outputs and transistor outputs. Relay outputs are used for switching AC voltages such as 24VAC, 110VAC or higher. Transistor outputs are used for smaller.

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The Siemens 6ES7322-1BP50-0AA0 is a 64 output Transistor Output Module. As with all transistor output modules, it can control DC loads only. Let's look at how one of the outputs operates. When the PLC signal is applied, the BJT will turn on and provide a current path for the load.

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1 Answer. Sorted by: 4. COM is the common connection for relay or transistor outputs; essentially when the output is activated, the PLC will energize the relay or transistor, effectively connecting the NO (normally open) pin to the COM (common) pin. Some PLCs have form-C contacts, which would have NO, COM and NC (normally closed) contacts.

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PLC Output Cards. These cards typically have 8 to 16 outputs of the same type and can be purchased with different current ratings. A common choice when purchasing output cards is relays, transistors or triacs. Relays are the most flexible output devices. They are capable of switching both AC and DC outputs.

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Transistors are electronic components, only aging, and there is no limit to the number of times of use. Relays also have a limit on how many times they can switch per minute, while transistors don't. Load type: Transistors can only carry DC loads, while relays can carry both AC and DC loads. Current: transistor current 0.2A-0.3A, relay 2A.

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Two of the most important fundamentals to understand when it comes to sensors is sinking and sourcing circuits. To properly wire your control device, you need to first know whether the sensor you are using is switching the positive or negative connection. For AC (alternating current) sensors, this is not an issue since AC power alternates it.

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The four possible combinations of input/output sinking/sourcing circuits are shown below. The common terminal is the terminal that serves as the common return path for all I/O points in the bank. Sink/source I/O circuits combine sinking and sourcing capabilities. This means that the I/O circuitry in the PLC will allow current to flow in either.

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Transistor (including thyristor) output is an active switch. It is required that the load must be matched or adapted to the corresponding power supply. For inductive loads, sometimes it is necessary to consider a diode. If you use pulse output, it is better to choose a PLC with a transistor output. The relay should sometimes be unstable.