FUJI X16-1 Processor | 16-bit 16 kB CPU Modbus RTU

This processor serves as the central processing unit for FUJI electric automation systems. It executes user application logic for industrial machine and process control. Therefore, it delivers reliable real-time control for manufacturing and production applications.

Physical and Processor Specifications

The FUJI X16-1 measures 11.5 cm in length and 8.0 cm in width. Moreover, its processor weight equals approximately 0.22 kg for DIN rail or panel mounting. A single 32-pin male connector links this processor to the FUJI backplane. Additionally, the unit includes built-in memory and a communication port.

Parameter	Specification
Brand	FUJI Electric
Full Model	X16-1
Category	Processor (CPU)
Dimensions (L x W x H)	11.5 cm x 8.0 cm x 5.5 cm (4.53″ x 3.15″ x 2.17″)
Processor Weight	0.22 kg (0.49 lbs)
Backplane Interface	1 x 32-pin Male Connector (FUJI Rack)
Power Supply Input	5 VDC from Backplane (0.6 A Typical)
Power Consumption	3.0 W (Typical)
Processor Type	16-bit Microcontroller (16 MHz)
Program Memory	16 kB RAM (Battery Backed)
Data Memory	8 kB RAM (Retentive with Battery)
Backup Battery	Internal Lithium (3V, 5 Year Life)
Execution Speed	0.5 µs per Boolean Instruction
Built-In Communication Port	1 x 9-pin D-Sub Male (RS-232)
Supported Protocol	Modbus RTU (Master/Slave) + FUJI Proprietary
Baud Rate Range	9600 to 115200 baud
Maximum Digital I/O	256 Points (with Expansions)
Maximum Analog I/O	32 Channels (with Expansions)
Programming Languages	Ladder Diagram (LD) + Instruction List (IL)
On-Board Components	1 CPU IC + 2 Memory Chips + 1 UART + 1 Real-Time Clock + 2 Line Drivers + 4 Protection Diodes + 1 Voltage Regulator
Energy Storage	2 x 100 µF Electrolytic Capacitors (35V) + 2 x 10 µF Tantalum (25V) + 1 x CR2032 Backup Battery
Battery Backup Time	5 Years (Typical for RAM and RTC Retention)
Scan Time	2 ms for 4 kB of Ladder Logic
Operating Temperature	0°C to +55°C (32°F to 131°F)
Storage Temperature	-25°C to +85°C (-13°F to 185°F)
Mounting Type	DIN Rail or FUJI PLC Rack
Status Indicators	1 Green LED (Power) + 1 Green LED (Run) + 1 Red LED (Fault) + 1 Yellow LED (Battery Low) + 1 Yellow LED (Port Activity)

Processing Performance and Memory Architecture

The FUJI X16-1 features a 16-bit microcontroller running at 16 MHz. Specifically, the 16 kB program memory stores ladder logic and IL applications. In addition, the 8 kB data memory holds process variables and retentive values. Moreover, the execution speed of 0.5 µs per Boolean instruction ensures fast response. Furthermore, a lithium battery retains RAM contents for up to five years. Consequently, this processor delivers reliable control for small to medium applications.

Built-In Communication and Connectivity

This processor includes one RS-232 serial port for programming and networking. For instance, the port connects to a PC for program uploads and monitoring. In addition, Modbus RTU protocol supports HMI connectivity and SCADA integration. Moreover, the processor can operate as a Modbus master or slave. Thus, this CPU integrates seamlessly into mixed-vendor automation environments.

Built-In Real-Time Clock and Task Management

This processor includes a real-time clock for time-stamped events and scheduling. Specifically, the clock retains date and time during power loss using battery backup. In addition, the processor supports cyclic and event-driven task execution. Moreover, a built-in watchdog timer monitors program execution for faults. Therefore, the FUJI X16-1 meets demanding response time requirements reliably.

Installation and Diagnostic Indicators

Five LED indicators provide operational status at a glance on this processor. First, a green Power LED lights when the 5 VDC backplane supply is present. Second, a green Run LED flashes during normal program execution. Third, a red Fault LED indicates hardware or software errors. Fourth, a yellow Battery Low LED warns when the backup battery needs replacement. Finally, a yellow Port Activity LED illuminates during data transmission. Thus, you can diagnose system health instantly without external tools.