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). Kindly, check and refer these tutorials step to step ( from the logic gate, PLC programming rules, etc.). There are two types of PLCs- Compact PLC and Modular PLC. and on the “sourcing” card, the input channel terminal is negative while the common (“VDC”) terminal is positive. Discrete input cards for PLCs typically have 4, 8, 16, or 32 channels. 1. For example: The PLC can output a high power signal to command a water pump to turn on. Analog input and output have both voltage and current. In the following block diagram, input and output modules are connected through the brain of PLC i.e. Before proceeding and understanding how sensors and actuators are wired to the input/output modules of PLC, we need to understand the concept of sourcing and sinking. The digital I/O signal gives status in the different form like –. ( Log Out / only 0 or 1 value. What is Live Zero in 4-20 mA Current Loop ? All Rights Reserved. Different PLC brands uses different nomenclatures. The singles can be anything like activating or deactivating output devices. It is useful in the ON or OFF condition. Here is PLC tutorials Link- https://dipslab.com/plc. Examples: Lamp, Coil, Buzzer, Relay, Motor, Fan, Heater, Actuator, Solenoid Valve and etc are the example of the Digital Output Signal. (Image via Allen-Bradley) An analog signal is one whose value continually varies over time. Save my name, email, and website in this browser for the next time I comment. only 0 or 1 value. Each output channel has its own optocoupler, driven by its own unique memory register bit inside the PLC’s memory. This website uses cookies to improve your experience. Based on Input and Output, the digital module is of two types. The module which interacts with the output signal is called as Output Module. 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. Thus, a “32-point input card” refers to an input circuit with 32 separate channels through which to receive signals from on/off switches and sensors. please help me with the loop power and self power connection for analog input module. Credits : by Tony R. Kuphaldt – Creative Commons Attribution 4.0 License. Multiple inputs (I) and output (O) modules are used in the PLC system. Sorry. The input and output types of PLC are divided into digital input and output, analog input and output, and high-speed pulse input and output. And the coil or lamp is used in the form of output. Usually, the voltage or current is given to the input module in the form of an analog signal. 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. 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. In a manner similar to discrete inputs, a PLC connects to any number of different discrete final control devices through a discrete output channel (Note1). A device that sources current to another “blows” current toward the other device. How to implement integral programming for S7-1200/1500 in STEP7 (TIA Portal). Change ), You are commenting using your Twitter account. 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 ‘. Central Processing Unit (CPU). Light from each LED shines on a photo-sensitive device such as a photo-transistor inside the module, which in turn activates a bit (a single element of digital data) inside the PLC’s memory. I tried to explain it with the help of the block diagram, classification, and examples. This analog signal provides any intermittent value between the two extreme limits (initial to final range) for the analog input module. The classification of input and output (I/O) modules of PLC is based on the types of signals. How does the TK6070IP use EB8000 software to convert to TK6071IP using EBpro software? 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.