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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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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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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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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 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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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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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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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.
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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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FA-COM PLC: Digital I/O Module. Series: MELSEC IQ-F SERIES: Type: TRANSISTOR OUTPUT (SINK) Occupied I/O Points on PLC: 16: Integrated Digital Outputs: 16: Output Type: TRANSISTOR: Output Logic: SINK: Product Dimensions & Weight. Width (mm) 40: Height (mm) 90: Depth (mm) 83: Weight (kg) 0,195:
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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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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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The actual switching in many output modules is performed by Bipolar Junction Transistors (BJTs): - In a Sinking module, the transistor is an NPN. - In a Sourcing module, the transistor is a PNP. The current flows into a sinking module and out of a sourcing module. If a PLC output module is listed as an NPN type, you can be sure that it is a.
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In summary, a transistor is fast, switches a small current, has a long lifetime and works with dc only. Whereas a relay is slow, can switch a large current, has a shorter lifetime and works with ac or dc. Select the appropriate one based upon your actual application needs. Learn quickly with our PLC Training DVD Series: on sale $599.00 $379.
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4420751 [AL2-4EYT from Mitsubishi Corporation] from RS Components, Ltd. These modules give additional I/O flexibility to Alpha 2 users. They fit alongside the Alpha 2 (see stock no 442-0789). Depth 53 mm, Height 90 mm, Width 24.5 mm. Manufacturer Series = Alpha 2. Output Type = Digital, Transistor. Number of Outputs = 4.