FUJI FSB084H PLC Module | 8 Ch 24V Discrete Input DIN Rail

This PLC module provides discrete input capability for FUJI electric automation systems. It interfaces directly with field sensors such as limit switches and push buttons. Therefore, it captures real-time status signals for programmable logic controller processing.

Physical and Input Specifications

The FUJI FSB084H measures 11.0 cm in length and 7.5 cm in width. Moreover, its module weight equals approximately 0.20 kg for DIN rail mounting. A single 16-pin removable terminal block handles all field wiring connections. Additionally, this module contains eight independent digital input channels.

Parameter	Specification
Brand	FUJI Electric
Full Model	FSB084H
Category	PLC Module (Discrete Input)
Dimensions (L x W x H)	11.0 cm x 7.5 cm x 5.0 cm (4.33″ x 2.95″ x 1.97″)
Module Weight	0.20 kg (0.44 lbs)
Primary Interface	1 x 16-pin Removable Screw Terminal Block
Backplane Interface	1 x 32-pin Male Connector (FUJI Rack)
Operating Voltage	24 VDC from Backplane (19.2 to 28.8 VDC)
Power Consumption	1.5 W (Typical)
Input Channels	8 Independent Channels
Input Type	Sink/Source (Selectable per Common Group)
Input Voltage Range	0 to 30 VDC
Input On-State Voltage	> 15 VDC
Input Off-State Voltage	< 5 VDC
Input On-State Current	7 mA Typical at 24 VDC
Input Impedance	3.4 kΩ
Input Response Time (On)	4 ms (Typical)
Input Response Time (Off)	4 ms (Typical)
Input Isolation	Optocoupler (1500 Vrms)
Common Configuration	8 Inputs Share One Common (Isolated Group)
On-Board Components	8 Optocouplers + 8 Current Limiting Resistors + 2 Protection Diodes + 1 EMI Filter + 1 Voltage Regulator
Energy Storage	1 x 47 µF Electrolytic Capacitor (35V) + 1 x 10 µF Tantalum (25V)
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 (EN 50022)
Status Indicators	8 Green LEDs (One per Channel) + 1 Green LED (Power)

Input Channel Features and Signal Processing

The FUJI FSB084H accepts eight independent discrete input signals at 24 VDC. Specifically, each input includes an optocoupler for complete electrical isolation from the logic side. In addition, the input impedance of 3.4 kΩ suits standard industrial proximity sensors. Moreover, all eight channels respond within 4 milliseconds to signal changes. Consequently, this module captures fast field events without missing critical transitions.

Energy Storage and Operational Stability

This PLC module stores energy using two onboard capacitors for power filtering. Specifically, one electrolytic capacitor smooths the 24 VDC supply for stable optocoupler operation. In addition, one tantalum capacitor provides high-frequency noise suppression for the input circuits. Furthermore, these capacitors maintain stable operation during brief power interruptions. Therefore, the FUJI FSB084H continues functioning through minor supply dips reliably.

Installation and Diagnostic Indicators

You will find nine LED indicators on the module’s front panel for diagnostics. First, eight green LEDs light when each corresponding input receives an active 24 VDC signal. Second, a green Power LED indicates the presence of backplane operating voltage. Additionally, the removable terminal block accepts 18-22 AWG stranded or solid wires. Thus, you can diagnose system status instantly without external tools or meters.