AB 1761-L20BWB-5A MicroLogix 1000 Series

AB 1761-L20BWB-5A MicroLogix 1000 Series

Product Overview: The 1761-L20BWB-5A controller from the MicroLogix 1000 series combines PLC and I/O functionality with a wide range of features. It is available in 3 models to meet most application scenarios, provides similar functionality to traditional SLCs and PLCs in a smaller size, is compatible with PanelView™ 800 graphic terminals, is programmable via RSLogix500 software, and has an instruction set common to the MicroLogix and SLC500 controller families.

Technical Specifications: 120 - 240V AC supply voltage, 737B of programme memory, 437B of data memory. 12 digital inputs, 24V DC sinking/sourcing type; 8 digital outputs, relay type; 4 analogue inputs, 2 voltage (±10V DC) and 2 current (0-20mA) input channels; 1 analogue output supporting 0-10V DC and 4-20mA outputs. Equipped with only 1 RS232 communication port, RS-232 communication protocol, no real-time clock and display, no base unit plug-in slot, no support for local expansion modules. Operating temperature range is 0°C - 55°C, storage temperature range is - 40°C - 85°C, relative humidity max 95% non-condensing, withstanding 11ms shock, vibration acceleration max 2.5g, vibration displacement max 0.381mm peak to peak, operating vibration frequency max 5Hz.

Features

Digital Input Port Features

Number and type: There are 12 digital input ports of 24V DC sinking/sourcing type. This type of input port is highly flexible, with sinking inputs activated when a high level voltage (24V DC) is applied to the input terminals, and sourcing inputs activated when a low level voltage is applied. It can be adapted to different types of sensors and external devices, and is capable of receiving a wide range of electrical signals to meet the needs of diverse industrial control scenarios.

Adaptation of electrical characteristics: 24V DC powered sensors such as proximity switches, photoelectric sensors, etc. can be directly connected. For 24V DC-powered devices, the controller's input port can effectively receive and convert signals to internal processable signals regardless of whether they require high level triggering or low level triggering, eliminating the need for additional level conversion circuits, simplifying system design and wiring, reducing costs, and improving system reliability and stability.

Digital Output Port Features

Quantity and type: There are 8 digital output ports, using relay type. The relay output has good electrical isolation performance, which can effectively isolate the internal circuit of the controller from the external load, avoiding the influence of external electrical interference on the controller, and also protecting the external load from the damage of the internal fault of the controller. It can control larger current and voltage loads and is suitable for driving all kinds of relays, contactors, solenoid valves and other industrial equipment.

Load driving ability: The contacts of relay output can withstand certain current and voltage, and can directly drive some devices with smaller power, such as small motors, indicator lights, alarms, etc. For larger power loads, although intermediate relays may be needed for expansion, the relay output port of this controller can still provide stable control signals to ensure the normal operation of the load, which has wide applicability in industrial control .

Scenario Application

Manufacturing production line control: In the production line of electronic equipment manufacturing industry, such as mobile phone assembly line, the digital input port of 1761-L20BWB-5A controller is connected to various types of sensors, such as photoelectric sensors for detecting the position of parts and components, and microswitches for judging the operating status of equipment, etc. These sensors input the status of the equipment and the position of the parts and components information into the controller in the form of 24V DC signal. These sensors input the status of the equipment and the position of the parts into the controller in the form of 24V DC signals. 

According to the preset procedures, the controller controls the relays through the digital output ports, and then drives the motors, solenoid valves, and other actuators to achieve the precise gripping, handling, and assembly of the parts. In the mobile phone shell assembly process, after the sensor detects the shell in place signal, the controller controls the relay to drive the robotic arm to accurately grasp the shell and place it in the specified position, while the analogue input port collects the data from the pressure sensor to monitor the pressure during the assembly process to ensure the assembly quality. In the automotive parts processing line, the controller can control the machine tool equipment. The digital input port receives signals from tool position sensors, workpiece clamping sensors, etc. to determine the working status of the machine. The analogue input port collects temperature sensor data to monitor the temperature of the tool and workpiece, and when the temperature is too high, the analogue output port controls the flow rate of the cooling system to ensure machining accuracy and normal operation of the equipment. 

The digital output port controls the start-stop and speed of the motor to achieve the machining operation of the workpiece.

Industrial automation control system: In the process of chemical production, many complex chemical reactions and physical processes are involved, which require precise control of temperature, pressure, flow rate and other parameters. 1761-L20BWB-5A controller's analogue input port is connected to the temperature, pressure and flow rate transmitters, which collects analogue signals of these parameters in real time and converts them into digital quantities for processing. According to the preset control strategy, the controller controls the opening of the regulating valve through the analogue output port to regulate the flow of materials and the reaction conditions to ensure the safe and stable operation of the production process and to improve the quality of the products and the output. In the wastewater treatment plant, the digital input port of the controller receives signals from liquid level sensors, water quality detection sensors, etc. to judge the liquid level and water quality of the wastewater. 

The analogue input ports collect data from pH sensors, dissolved oxygen sensors, etc., to monitor the effect of sewage treatment. The digital output port controls the starting and stopping of pumps, fans and other equipment, and the analogue output port controls the dosage of dosing device, which realizes the automated control of the sewage treatment process, reduces the cost of labour and improves the treatment efficiency.

Building automation system: In the lighting system of intelligent buildings, the digital input port of 1761-L20BWB-5A controller is connected to the light sensor and human body infrared sensor, when the light sensor detects the ambient light intensity is low and the human body infrared sensor detects the human body activity, the controller will control the relay through the digital output port to turn on the lighting in the corresponding area. The analogue input port can collect the current and voltage signals of the lighting fixtures, monitor the working status of the lighting fixtures, and realize the intelligent control of the lighting system to achieve the purpose of energy saving and improving the user experience. 

For air conditioning system control, the analogue input port of the controller is connected to temperature and humidity sensors to collect real-time indoor temperature and humidity data. According to the preset comfort temperature and humidity range, the controller controls the control valve and frequency converter of the air conditioning unit through the analogue output port to regulate the cooling and heating power as well as the air volume of the air conditioner to provide a comfortable indoor environment for the users and reduce energy consumption at the same time.