Indicates the CPU is executing the loaded program. If flashing or off while power is present, the PLC may be in STOP mode or a program error exists. ERROR (Red): Indicates a critical hardware or syntax error. Steady Red: Internal CPU failure or corrupted memory.
Clear memory, re-upload the program code, and check memory cassette seat. Battery voltage low (if RAM configuration is used).
If your FA2J uses volatile RAM backed up by a lithium battery, follow this procedure to change it safely:
While the FA2J is now a discontinued product, it remains a reliable solution for many existing automation systems due to its durability and easy-to-integrate modular setup. IDEC FA2J PLC Specifications Guide | PDF - Scribd idec plc fa2j manual
Without the FA2J manual, a simple wiring mistake can send 24V DC to a 5V logic circuit, destroying the CPU.
According to documentation from Galco and Scribd , the FA2J boasts the following specifications:
Features 15 basic and 57 advanced instructions, allowing for complex arithmetic and BCD-to-binary conversions. Hardware Components and Installation Indicates the CPU is executing the loaded program
The IDEC series is a legacy flat-pack modular Programmable Logic Controller (PLC) known for its low profile and processing speed of
Capable of handling both AC and DC voltages (up to 250V AC / 30V DC, max 2A per point). Inductive loads (solenoids, contactors) require external surge suppressors (RC snubbers for AC, diodes for DC) to protect the internal relay contacts.
The FA2J supports a range of memory types that are accessible via SCADA or HMI systems. Common data areas include: Steady Red: Internal CPU failure or corrupted memory
The IDEC FA2J features a modular, compact design suitable for small to medium automation tasks. Understanding its hardware footprint is essential for proper maintenance and retrofitting. Base Units and Expansion
Connect the RS-232 side of the link adapter to a high-quality USB-to-Serial converter (chipsets like FTDI or Prolific are highly recommended to prevent packet loss). Essential Instruction Set
Includes internal relays, counters, timers, and bidirectional shift registers. 3. Software and Connectivity Programming Software : Modern programming can be performed using IDEC WindLDR software , which supports the FA-2J series. Computer Interfacing