Introduction
Allen-Bradley MicroLogix 1400 is a versatile and compact Programmable Logic Controller (PLC) designed for a wide range of applications. It features a built-in LCD with backlight, which provides a simple interface for monitoring and manipulating bit/integer values1. The MicroLogix 1400 supports up to 256 discrete I/O and seven 1762 MicroLogix Expansion I/O modules. It also includes two serial ports supporting various protocols like DF1, DH-485, Modbus RTU, DNP3, and ASCII. With 10 KB of user program memory and 10 KB of user data memory, it can handle tasks such as data logging and recipe management. The controller is programmed using RSLogix 500 software and is commonly used in industries like material handling, packaging, and general industrial machinery.
Featuring 32 digital I/O, 6 optional analog I/O, and support for any seven 1762 expansion modules, the MicroLogix 1400 supported more total I/O than any previous model (up to 256 digital I/O points.)
As with the MicroLogix 1000, 1200, and 1100, the MicroLogix 1400’s DC input models supported either sinking or sourcing inputs. And like the MicroLogix 1200, the MicroLogix 1400 also came equipped with removable terminal blocks and wiring labels. If fact, the 1400 uses the same RTB’s as the MicroLogix 1200 40-point models.
MicroLogix 1400 Overview
- 24VDC power input
- 24x inputs – 20x digital and 4x analogue
- 14x outputs – 12x digital and 2x analgoue
- A combination of relays and FETs for the digital outputs
- 12bit analogue input and output resolution
- Each digital output channel can individually drive 2.5A
- Individual ethernet and RS-232 communications ports
- Input and output expansion cards can be added
- A programmable LCD
- Is fully operational when subjected to -20 to 60C temperatures
Key Features of the MicroLogix 1400
High I/O Count
The MicroLogix 1400 supports up to 20 digital inputs and 12 digital outputs, with expandability up to seven 1762 I/O modules, providing up to 256 digital I/O points. This makes it suitable for a wide range of applications, from material handling to general industrial machinery
Built-in LCD Display
The controller features a built-in LCD display with backlight, which allows users to view controller and I/O status, monitor messages, and manipulate bit/integer values directly on the device. This simplifies troubleshooting and reduces the need for additional equipment.
High-Speed Counters
The MicroLogix 1400 includes up to six embedded 100 kHz high-speed counters, which are ideal for applications requiring precise counting and timing, such as motor control and packaging.
Memory and Data Logging
With 10 KB of user program memory and 10 KB of user data memory, the MicroLogix 1400 provides ample space for programming and data storage. Additionally, it supports up to 128 KB for data logging and 64 KB for recipe storage, making it suitable for applications requiring extensive data logging and recipe management
RSLogix 500 Software (For programming & communication)
The controller is programmed using RSLogix 500 software, which simplifies project development and improves productivity. The software provides a user-friendly interface for programming, testing, and debugging the controller.
How to check a fault on a MicroLogix 1400 PLC?
- Press the ECS button to go to the main menu
- Click the down arrow button to go to advanced settings
- Use the down arrow button to select the fault code
- Check the four-digit error code
- The first two digits of the error code indicate where the error originated
- Check the PLC instruction to determine the error code
How to find IP address of MicroLogix 1400 PLC?
- By pressing down arrow go to advanced settings and press ok
- Go down by using down arrow and Select ENT Cfg
- Go down and select IP address by pressing ok
- ENET mode should be in static, otherwise set to statice and press ok
- It will Show IP address
Standard MicroLogix 1400 Models
| Catalog Number | Description |
| 1766-L32AWA | MicroLogix 1400, 20 Digital 120V AC Inputs, 12 Relay Outputs, 110/240V AC Power |
| 1766-L32AWAA | MicroLogix 1400, 20 Digital 120V AC Inputs, 12 Relay Outputs, 4 Analog (12 bits) Inputs, 2 Analog (12 bits) Outputs, 110/240V AC Power |
| 1766-L32BWA | MicroLogix 1400, 12 Digital Fast 24V DC Inputs, 8 Digital Normal 24V DC Inputs, 12 Relays Outputs, 110/240V AC Power |
| 1766-L32BWAA | MicroLogix 1400, 12 Digital Fast 24V DC Inputs, 8 Digital Normal 24V DC Inputs, 12 Relays Outputs, 4 Analog (12 bits) Inputs, 2 Analog (12 bits) Outputs, 110/240V AC Power |
| 1766-L32BXB | MicroLogix 1400, 12 Digital Fast 24V DC Inputs, 8 Digital 24V DC Inputs, 6 Relay Outputs, 3 Fast 24V DC Outputs, 3 Normal 24V DC Outputs, 24V DC Power |
| 1766-L32BXBA | MicroLogix 1400, 12 Digital Fast 24V DC Inputs, 8 Digital 24V DC Inputs, 6 Relay Outputs, 3 Fast 24V DC Outputs, 3 Normal 24V DC Outputs, 4 Analog (12 bits) Inputs, 2 Analog (12 bits) Outputs, 24V DC Power |
MicroLogix Expansion I/O Modules
Digital Input Modules
| Catalog Number | Description |
| 1762-IA8 | 8 Point 120 VAC Input Module |
| 1762-IQ8 | 8 Point 24 VDC Sink/Source Input Module |
| 1762-IQ16 | 16 Point 24 VDC Sink/Source Input Module |
| 1762-IQ32T | 32 Point 24 VDC Sink/Source Input Module |
Digital Output Modules
| Catalog Number | Description |
| 1762-OA8 | 8 Point 120/240 VAC Output Module |
| 1762-OB8 | 8 Point 24 VDC Source Output Module |
| 1762-OB16 | 16 Point 24 VDC Source Output Module |
| 1762-OB32T | 32 Point 24 VDC Source Output Module |
| 1762-OV32T | 32 Point 24 VDC Sink Output Module |
| 1762-OW8 | 8 Point VAC/VDC Relay Output Module |
| 1762-OW16 | 16 Point VAC/VDC Relay Output Module |
| 1762-OX6I | 6 Point 24 VDC Isolated High Current Relay Output Module |
Analog I/O Modules
| Catalog Number | Description |
| Analog Input Modules | |
| 1762-IF4 | 4 Channel Current/Voltage Analog Input Module |
| Analog Output Modules | |
| 1762-OF4 | 4 Channel Analog Output Module |
| Analog Combination Modules | |
| 1762-IF2OF2 | 4 Channel Analog Combo Module |
| RTD and Thermocouple Modules | |
| 1762-IR4 | 4 Channel, RTD/Resistance Module |
| 1762-IT4 | 4 Channel, Thermocouple/Mv Module |
RSLogix 500 Software
RSLogix 500 software is a cornerstone in programming Allen-Bradley's SLC 500 and MicroLogix families of programmable logic controllers (PLCs). Known for its user-friendly interface and robust functionality, RSLogix 500 offers a ladder logic programming environment that facilitates efficient system configuration, troubleshooting, and maintenance.
One of the software standout features is its user-friendly graphical interface, which allows engineers to design, debug, and monitor control systems efficiently. With features like drag-and-drop functionality and real-time troubleshooting tools, RSLogix 500 significantly reduces development time and minimizes operational downtime. The software also supports online and offline programming, providing flexibility for making adjustments while a system is running or during maintenance periods.
Application of MicroLogix 1400 PLC
- Material Handling
- Packaging Applications
- General Industrial Machinery
- Printing
- Food and Beverage
- Pharmaceutical
- Water Wastewater / SCADA
- Clutch/Brake control
- Position Control - Pick-and-place / Conveyor
The MicroLogix 1400 compatibility with modern protocols like Modbus TCP/IP and EtherNet/IP ensures seamless integration into existing systems. Its wide range of digital and analog I/O options, along with its flexibility for expansion, allows users to customize the PLC to meet specific application needs. Furthermore, the user-friendly programming environment provided by RSLogix 500 or Connected Components Workbench (CCW) simplifies configuration and reduces deployment time.
The MicroLogix 1400 PLC stands as a testament to Allen-Bradley's commitment to delivering reliable, scalable, and versatile automation solutions. Whether used in standalone applications or integrated into larger systems, the MicroLogix 1400 combines flexibility with robust functionality to address a wide array of industrial needs. Its built-in communication capabilities, enhanced processing power, and expandable I/O options ensure seamless integration with modern automation requirements.
