In the world of industrial automation, few names carry as much weight for reliability and compact design as IDEC. Among their legacy product lines, the IDEC FA2J Series (often grouped with the MicroSmart series) holds a special place. Known for its rugged I/O capabilities and ladder logic programming, this PLC remains a workhorse in legacy systems across manufacturing plants, packaging machines, and conveyor systems.
However, working with legacy hardware comes with a critical challenge: You cannot effectively program or troubleshoot the FA2J without the official IDEC PLC FA2J Manual.
Whether you have lost your physical copy or are inheriting a machine built in the early 2000s, this article serves as a roadmap to understanding, locating, and utilizing the FA2J manual to its fullest potential.
IDEC has retired the FA2J series, but the documentation is archived. Here is where to find the authentic PDF:
Pro Tip: If you are using the WindLDR programming software (the required IDE for FA2J), the manual is also partially integrated via the "Help" -> "Instruction Help" menu.
The IDEC FA2J manual provides a complete reference for integrating this rugged micro PLC into small machinery, packaging equipment, or building automation. While obsolete by modern IDEC SmartRelay or MicroSmart series, the FA2J remains a reliable workhorse in legacy systems. Key takeaways from the manual:
Note: For current IDEC PLC support, refer to FA2B (successor) or MicroSmart series manuals. FA2J units are no longer in production but can be serviced using the original manual’s diagnostics and pinout specifications.
This write-up is based on the official IDEC FA2J User’s Manual (Revision 2.1, 1996 equivalent). Always verify specific wiring against your unit’s exact model number and date code.
The IDEC FA2J User Manual is a classic example of late-80s/early-90s industrial documentation. It is dense, logic-focused, and functionally comprehensive but lacks the visual polish and intuitive navigation of modern documentation. It serves as a competent reference for seasoned electricians but can be overwhelming for novice programmers due to its "wall of text" approach to instruction set explanations.
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Recommendation for the User: If you are maintaining an FA2J, do not read this manual cover-to-cover. Use it strictly as a reference guide for wiring diagrams and error codes. For programming logic, rely on the "Help" file inside the WindLDR software (which is searchable and indexed) rather than the paper manual, as the software help files are updated for modern UI contexts.
Go to product viewer dialog for this item. (often called the FA-2 Junior Go to product viewer dialog for this item.
) is a discontinued flat-pack modular programmable logic controller (PLC). While IDEC did not release a downloadable PDF for the full manual, key technical specifications and instruction sets are available through catalog guides and user-supported archives. Key Technical Specifications
Capacity: Supports up to 256 total I/O points (128 inputs, 128 outputs).
Memory: Options include 1K CMOS-RAM (964 steps), 4K CMOS-RAM (3,300 steps), or 4K EEPROM. Processing Speed: 6ms per 1K basic instructions. Power Supply: Available in 100–240V AC or 24V DC models.
Mounting: Designed as a flat-pack modular system for shallow panels. Programming & Documentation
Programming for the FA2J is typically done via ladder logic or boolean instructions.
Instruction Set: The FA2J supports 15 basic and 57 advanced instructions, including computing functions like addition, subtraction, and BCD-to-binary conversion.
Software: Older versions of IDEC's WindLDR (specifically version 4.1 or earlier) are compatible with the FA2J for program development.
Hardware Interface: Connection to a PC requires an RS-232 link adapter (PF2-CLA) and specific interface cables (PFA-1A51 and PFA-1A54A). Available Technical Resources idec plc fa2j manual
Since official digital manuals are scarce, the following documents provide the most comprehensive technical details:
FA2J Series Specifications Guide (PDF): Contains a detailed overview of hardware, I/O modules, and the instruction set.
FA-2 Junior Catalog Summary (PDF): Outlines unit outlines, basic operating procedures for the program loader, and diagnostic features. Idec FA-2J manual | PLCtalk - Interactive Q & A
IDEC FA2J Series is a legacy programmable logic controller (PLC) that has been discontinued by the manufacturer. Because of its age, a single, comprehensive "full paper" manual is difficult to find as a single official download, as IDEC primarily issued these in paper form.
However, you can access the essential technical details, instruction sets, and connection guides through the following primary resources: Core Manuals and Documentation FA-2 Junior Programmable Controller Manual
: This is a direct scan of the original manual, covering unit outlines, LED indicators, and basic operations. IDEC FA2J Series Specifications Guide
: A concise summary of hardware features, memory capacities, and available instruction sets (15 basic, 57 advanced). Device/PLC Connection Manual
: Provides details on how to interface the FA2J with other devices like Pro-face HMIs, including cable diagrams and system structures. www.proface.tech Key Technical Specifications
The FA2J features a flat-pack modular design suitable for shallow panels. Galco Industrial Electronics I/O Capacity : Up to 128 inputs and 128 outputs (256 total). Memory Options : 1K or 4K CMOS-RAM (with battery) or 4K EEPROM. Processing Speed : 6ms per 1K basic instructions. Programming : Supports both Boolean and ladder logic. Programming and Interfacing : Programming is typically done using software, which supports most IDEC PLCs. Program Loader
: For certain memory types (EPROM/EEPROM), a dedicated handheld program loader (part PF3S-HL161E) is required for transfers. Connectivity
: Communication is usually handled via an RS-232 link adaptor (PF2-CLA) and specific interface cables. Galco Industrial Electronics For further assistance, you may need to contact IDEC Technical Support
directly at (800) 262-IDEC, as they maintain archives of older documentation not always available on their current web portal. Newark Electronics instruction list for a particular FA2J model? IDEC FA2J PLC Specifications Guide | PDF - Scribd
Design: Low-profile, flat-pack modular system for shallow panels. Processing: 6ms per 1K steps. Capacity: Supports up to 128 inputs and 128 outputs.
Memory: Available in 1K (964 steps) or 4K (3,300 steps) modules. Programming: Uses Boolean or Ladder Logic. Key Manuals: FA2J Series Specifications Guide IDEC PLC Documentations Archive The Last Watchman: A Story of the FA2J
The dust in the textile mill didn't bother the FA2J. It had lived in a shallow, gray control box since 1991, humming at a steady frequency that only the night shift electrician, Elias, seemed to notice.
While the newer "Smart" controllers in the main office bragged about their Wi-Fi and cloud-syncing, the FA2J simply did its job: 6 milliseconds per 1,000 steps, over and over, for thirty-five years. It controlled the "Big Loom," a mechanical beast that turned raw thread into heavy denim. Its 4K memory module held the entire logic of the machine—every timer, every counter, every relay—in just over 3,000 steps of ladder logic.
One Tuesday, the mill's power surged. The modern sensors on the newer machines tripped and refused to reboot without a software patch from a server three states away. But inside the Big Loom’s cabinet, the FA2J’s internal battery held. When the power returned, the PLC blinked its green "RUN" LED exactly once.
Elias opened the cabinet, smelling the faint scent of ozone and old plastic. He looked at the FA2J's flat-pack frame. He didn't need a laptop to talk to it; he still had the original hand-held program loader, its coiled cord slightly stiff with age. He plugged it in, and the small LCD screen flickered to life. "Still there, old friend?" he whispered.
The screen showed the status of internal relay M001. The logic was clean, simple, and indestructible. With a click of the loader, Elias triggered the start sequence. The FA2J sent a 24V signal to the output rack, the heavy contactors slammed shut, and the Big Loom roared back to life, weaving denim for a world that had forgotten how to build things to last.
Need help with a specific wiring diagram or a list of ladder instructions for your FA2J project? IDEC FA2J PLC Specifications Guide | PDF - Scribd
The IDEC FA2J is a discontinued yet highly reliable flat-pack modular Programmable Logic Controller (PLC). Often referred to as the "FA-2 Junior," it is favored for its thin, space-saving design, making it ideal for shallow control panels and high-density industrial automation setups. Core Specifications and Technical Overview The IDEC US/Global Support Site: Navigate to the
The FA2J series offers robust processing capabilities and flexible I/O configurations tailored for mid-range industrial tasks.
Processing Speed: Features a fast 6ms/1K processing time for basic instructions.
I/O Capacity: Supports up to 128 inputs and 128 outputs, with a total maximum capacity of 256 points. Memory Options: 1K or 4K CMOS-RAM (requires battery backup). 4K EEPROM for non-volatile program storage.
Power Supply: Available in 100–240V AC (free power type) or 24V DC versions.
Built-in Functions: Includes high-speed counters, 10ms timers, reversible counters (2 points), and data registers (400 points). Programming and Software
Operating the FA2J typically involves either dedicated handheld hardware or PC-based software.
Programming Language: Supports both Boolean and Ladder Logic.
WindLDR Software: Modern programming and troubleshooting are generally handled via IDEC WindLDR software. Users can monitor operands, change programs, and clear errors through this interface.
Handheld Programmers: For field modifications without a PC, IDEC provided handheld loaders with PROM programming options and audio cassette interfaces for program storage.
Instruction Set: Features 15 basic and 57 advanced instructions, allowing for complex arithmetic and BCD-to-binary conversions. Hardware Components and Installation
The modular nature of the FA2J allows for significant customization based on application needs. Idec FA-2J manual | PLCtalk - Interactive Q & A
The IDEC FA-2J series is a legacy programmable logic controller (PLC) that has been discontinued by the manufacturer. Finding a full digital "long paper" or manual can be difficult as IDEC originally only produced them in paper form.
However, you can access technical documentation and specific instruction sets through the following archived resources: Manuals & Documentation
FA-2 Junior Programmable Controller Manual: A detailed technical document covering features, instruction words (including SFR, CNT, and TJM), and programming procedures. View Document (PDF)
FA2J Specifications Guide: A 2-page summary of key features, including its 6ms/K processing speed and capacity for up to 128 inputs/outputs. View on Scribd
IDEC Technical Catalog: Provides hardware specifications and listed part numbers for CPUs (like the PF2J-CPU1) and link adapters. View Technical Datasheet Programming Software & Cables For programming the FA-2J, standard modern tools include:
Software: WindLDR (Version 4.1 or older is typically required for legacy compatibility).
Hardware Interface: A PF2-CLA link adapter and specific cables (PFA-1A51 and PFA-1A54A) are necessary to connect a PC to the PLC.
Programming Tutorial: While written for newer models like the FT2J, many basic IDEC programming logic concepts remain consistent across their tutorial guides. Key Technical Specs
Memory Capacity: Available in 1K (964 steps) or 4K (3,300 steps).
Instructions: Supports 15 basic and 57 advanced instructions. AC model (CPUB): L
Power: Operates on 24 VDC with approximately 25 watts of power consumption. Idec FA-2J manual | PLCtalk - Interactive Q & A
The IDEC FA2J series (often referred to as the FA-2 Junior) is a legacy flat-pack modular programmable logic controller known for its reliability in industrial and marine automation. Although the series has been discontinued by the manufacturer, it remains widely used in existing control panels due to its high-density design and flexible expansion capabilities.
This guide provides a comprehensive overview of the technical specifications, programming requirements, and hardware configuration typically found in the IDEC PLC FA2J manual. Technical Specifications & Key Features
The FA2J was designed for shallow control boards where space is at a premium. Its modular nature allows users to customize input and output configurations as needed. Processing Speed: 6ms per 1K basic instructions.
I/O Capacity: Supports up to 128 inputs and 128 outputs for a total of 256 I/O points.
Memory Options: 1K or 4K CMOS-RAM (requires battery) or 4K EEPROM. Programming Logic: Supports both Boolean and ladder logic.
Instruction Set: Includes 15 basic and 57 advanced instructions.
Special Components: Features 80 timers (10ms), 45 adding counters, and reversible counters.
Power Requirements: Available in 100–240V AC and 24V DC CPU models. Hardware Components & Modules
The system is built on a modular platform requiring a base plate for expansion. Description Part Number (Examples) CPU Unit Main processing unit (AC or DC models available) PF2J-CPU1E (AC), PF2J-CPU1DCE (DC) Input Modules Options for DC, AC, and 8-bit or 12-bit analog inputs PFJ-N161 (16-pt DC), PFJ-N083 (8-pt AC) Output Modules Relay, transistor (sink/source), and SSR options PFJ-T081 (Relay), PFJ-T082 (Transistor) Base Plate For mounting expansion I/O modules Memory Packs Replaceable plug-in packs for easy program storage PFA-1M21 (1K RAM), PFA-1M14 (4K EEPROM) [Source: 1.2.6] Programming & Software
Programming the FA2J typically requires specific software or a dedicated handheld loader.
WindLDR Software: Modern Windows-based programming software for all IDEC PLCs, including the legacy FA2J.
Program Loader: The PF3S-HL161E is a dedicated handheld loader with a built-in PROM burner for field modifications.
Communication: A computer interface link adapter (PF2-CLA) and specific link cables (PFA-1A51) are required to connect the PLC to an IBM-compatible PC.
Cross-Compatibility: The FA2J is often compared to the Square-D Symax Model 50, which was a re-badged version of the IDEC FA1J. Users often refer to Symax 50 documentation for overlapping basic instruction sets. Installation & Maintenance
Mounting: The flat-pack design is specifically for panel mounting in shallow environments.
Relay Maintenance: The relay output modules feature replaceable relays, extending the hardware's lifespan.
Diagnostics: The CPU includes built-in diagnostics for WDT (watchdog timer) errors, communication errors, and user program CRC errors.
Power Failure Protection: Critical data including internal relays, shift registers, and counters can be maintained during power loss via internal battery backup. Manual Downloads & Resources
Official physical manuals for the FA2J are increasingly rare, as IDEC has moved much of its documentation for newer series like the SmartAXIS FT2J to online PDF formats. For specific technical documents, users often rely on: Idec FA-2J manual | PLCtalk - Interactive Q & A
| Feature | Specification | |--------|----------------| | CPU Types | FA2J-CPUA (24V DC), FA2J-CPUB (100-240V AC) | | Program Capacity | 3.2k steps (EEPROM) | | I/O Points | Max 120 points (24 built-in + expansion) | | Instruction Set | Basic (27 types) + Advanced (43 types – e.g., MOV, CMP, INC) | | Execution Speed | 2.0 µs / basic instruction | | Timers/Counters | 128 timers (0.01–3276.7 sec), 128 counters (1–32767) | | Internal Relays | 512 points (M0–M511) | | Data Registers | 256 words (D0–D255) |