This module captures discrete input signals from field sensors and operator devices. It provides 16 independent input points for monitoring digital status conditions. Engineers use this unit for pushbuttons, limit switches, and proximity sensors. The design offers selectable sink or source wiring configurations for maximum flexibility. Its compact housing fits standard backplane slots in industrial control systems.
Input Channel Architecture
The NJ-X16-1C8 provides 16 optically isolated input channels arranged in two groups of eight. Each group shares a common return terminal for simplified field wiring. Every channel incorporates a built-in LED indicator for immediate visual status verification. The optocouplers provide 1500 VAC isolation between field circuits and the backplane logic. This isolation protects the processor from external surges and wiring errors.
Electrical Specifications and Input Ranges
Each channel accepts DC input voltages from 10 VDC to 30 VDC with a nominal 24 VDC rating. The input current measures approximately 6.5 mA at the nominal voltage level. Channel turn-on threshold sits at 8 VDC while turn-off occurs below 4 VDC. This hysteresis prevents contact bounce and noise-induced false triggering. Consequently, the module reliably interprets switch status in electrically harsh environments.
Response Speed and Filtering
The NJ-X16-1C8 achieves a typical response time of 1 millisecond for input detection. Users can select programmable input filters from 0.5 ms to 10 ms for noise rejection. The module also includes a built-in input delay for contact debouncing applications. These filtering options accommodate both fast and slow field devices. Furthermore, the module captures short-duration pulses for high-speed counting applications.
Physical Dimensions and Mounting
The NJ-X16-1C8 measures 12.7 cm in width, 25.4 cm in height, and 20.3 cm in depth. It weighs approximately 0.9 kg, which ensures secure seating in the rack assembly. A steel housing provides mechanical protection and electromagnetic shielding. The unit mounts directly into standard 19-inch racks or compatible PLC backplanes. Its front panel places input terminals and status LEDs for convenient access.
Field Wiring and Connector Details
A 40-pin ribbon cable connector handles all field termination points on the front face. This connector accepts wire gauges ranging from 0.2 mm² to 1.5 mm². The module includes removable terminal blocks for straightforward installation and replacement. Each terminal block carries clear labeling for channel identification and wiring guidance. Moreover, the connector features a positive locking mechanism for vibration resistance.
Internal Components and Power Consumption
The printed circuit board contains 16 optocouplers, 16 resistors, and 4 transient suppression diodes. It draws 300 mA from the 5 VDC backplane under full operational load. The module also requires 50 mA from the 24 VDC field supply for input excitation. No energy storage devices appear on the board for this purely combinational circuit. The simple passive input design ensures high reliability and zero calibration requirements.
Status Indication and Diagnostic Functions
Each of the 16 input channels has a dedicated front-panel green LED indicator. The LEDs illuminate when the corresponding input voltage exceeds the turn-on threshold. A single red LED signals overall module health and backplane communication status. The module transmits real-time input data to the processor during each scan cycle. This immediate visual feedback enables rapid field troubleshooting without software tools.
Environmental Durability and Compliance
The NJ-X16-1C8 operates reliably across temperatures from 0°C to 60°C. It withstands humidity levels up to 95% without condensation affecting circuit performance. The module complies with IEC 61000-4-4 for electrical fast transient immunity. Vibration tolerance meets IEC 60068-2-6 requirements for factory floor installations. This robust design suits automotive assembly, packaging lines, and material handling systems.
Technical Data Sheet – Fuji NJ-X16-1C8
| Parameter | Specification |
|---|---|
| Brand | Fuji |
| Model | NJ-X16-1C8 |
| Category | Input Module |
| Number of Inputs | 16 optically isolated |
| Input Groups | 2 groups of 8 (common return per group) |
| Wiring Configuration | Selectable sink or source |
| Nominal Input Voltage | 24 VDC |
| Input Voltage Range | 10 VDC to 30 VDC |
| Input Current (at 24V) | 6.5 mA per channel |
| Turn-On Threshold | 8 VDC |
| Turn-Off Threshold | 4 VDC |
| Typical Response Time | 1 ms |
| Programmable Filter | 0.5 ms to 10 ms (selectable) |
| Contact Debounce | Built-in delay option |
| Isolation Voltage | 1500 VAC (field to backplane) |
| Backplane Current | 300 mA at 5 VDC |
| Field Supply Current | 50 mA at 24 VDC |
| Dimensions (W×H×D) | 12.7 × 25.4 × 20.3 cm |
| Weight | 0.9 kg |
| Housing Material | Steel with EMI shielding |
| Field Connector | 40-pin ribbon cable |
| Wire Gauge Range | 0.2 – 1.5 mm² |
| Terminal Blocks | Removable, labeled |
| Optocouplers | 16 |
| Resistors | 16 |
| Suppression Diodes | 4 |
| Input Status LEDs | 16 green (one per channel) |
| Module Status LED | 1 red |
| Energy Storage | None (passive input design) |
| Operating Temperature | 0°C to 60°C |
| Humidity Tolerance | 95% RH non-condensing |
| EMC Compliance | IEC 61000-4-4 |
| Vibration Standard | IEC 60068-2-6 |
Details
| Weight | 0.9 kg |
|---|---|
| Dimensions | 127 × 254 × 203 mm |
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