Examples are Temperature transmitter, thermocouples, Pressure transmitter, Flow transmitter, Level Transmitter, etc.. Several “common” terminals labeled with “C” codes service clusters of output channels. How to Use Encode and Decode Instructions in PLC ? This is all about the basics you should know about PLC input-output modules. In this module, the I/O signal work on the binary system i.e. What is the Input and Output Module in PLC? High/Low, True/False and 1/0 for General Status, Activated/Deactivated for Switching Mechanism, Close/ Open for the Switching Contact Status, In AB, ABB, and Siemens PLC, the input is represented by ‘, But, the input of the Delta & Mitschibushi PLC is represented by ‘. Note 2 : By “control wire,” I mean the single conductor connecting the I/O card channel to the field device, as opposed to conductors directly common with either the positive or negative lead of the voltage source. This analog signal provides any intermittent value between the two extreme limits (initial to final range) for the analog input module. In Modular PLC, the capability of the I/O module is not fixed. The difference between the transistor output and the relay output is: the transistor output current is small (driving capacity is 0.75A), while the relay output is large (about 2A, the large can reach 5A); the transistor output voltage is only 24VDC, and the relay is based on your wiring ; The response speed of the transistor is fast, the speed of the relay is slow; the number of transistor switches is almost unlimited, and the relay has a life limit (about 30W times). It means that it processes the input data and provides information to another system. Based on the signals, I/O modules are classified into two main parts. Basically, there are two types of signals- Discrete signals and Continous signals. Change ), Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). A device that sources current to another “blows” current toward the other device. A device that sinks current “sucks” current from the other device. ( Log Out /  You should know the digital analog quantity, the digital quantity is only 0 and 1 (the circuit is represented as on and off), the analog quantity is a current or voltage signal with a difference in size. NPN is more common in European and American brand products, and PNP is more common in Asian products. A legend on the inside of the cover shows the purpose of each screw terminal: eight input channels (numbered 0 through 7) and two redundant “DC Com” terminals for the negative pole of the DC power supply to connect: A standard feature found on practically every PLC discrete I/O module is a set of LED indicators visually indicating the status of each bit (discrete channel). And the coil or lamp is used in the form of output. The digital module is also called Discrete Module. This opto-coupled arrangement makes each input channel of a PLC rather rugged, capable of isolating the sensitive computer circuitry of the PLC from transient voltage “spikes” and other electrical phenomena capable of causing damage: The internal schematic diagram for a discrete input module (“card”) shown above reveals the componentry typical for a single input channel on that card. The classification of input and output (I/O) modules of PLC is based on the types of signals. Change ), You are commenting using your Twitter account. Save my name, email, and website in this browser for the next time I comment. FLEX I/O modules from Allen-Bradley give designers the ability to mix and match analog, digital, and specialty I/O with up to 32 I/O points per module. Helped me with my research work. Multiple inputs (I) and output (O) modules are used in the PLC system. Top 100 PLC Objective Questions and Answers, DP Transmitter Interface Level Measurement Principle, Limitations, Selection, Installation, Design & Calibration, DP Transmitter Dry Leg & Wet Leg Calculations, Types of CPU Communication Ports in Siemens PLC. I have curated more PLC tutorials on DipsLab.com. Here is PLC tutorials Link- https://dipslab.com/plc. Again, analog I/O modules are also of two types. Based on Input and Output, the digital module is of two types. Electrical polarity is not an issue with AC discrete I/O, since the polarity of AC reverses periodically anyway. This input module is connected with the CPU for the initial automated processes. Also, add communication module in block diagram representation, nowadays communication module is increasingly being used to monitor and analyze the data’s ( SCADA, IIOT, BMS, EMS, etc). CPU processes all the input data. Do I need to install additional software to configure functional modules in the TIA Portal? One should always consult these diagrams before connecting devices to the I/O points of a PLC! As with the schematic diagram for a discrete input module shown previously, the schematic diagram shown here for a discrete output module reveals the componentry typical for a single channel on that card.

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