FUJI NB1-E24X-AC PLC Controller – NB1 Series

FUJI NB1-E24X-AC: 24-Point Mixed I/O Micro PLC with AC Mains Input for Standalone Machine Control

The FUJI NB1-E24X-AC is a fixed-configuration micro programmable logic controller within the FUJI Electric NB1 Series platform. It integrates 24 digital I/O points and accepts AC mains power (100–240 VAC, 50/60 Hz) directly, removing the dependency on an external 24 VDC power supply rail. This architecture reduces panel component count, simplifies wiring topology, and lowers overall BOM cost in both greenfield installations and relay-logic retrofit projects. The unit executes IEC 61131-3 compliant programs — primarily Ladder Diagram and Function Block Diagram — with a deterministic scan cycle suited to discrete process control, conveyor sequencing, and auxiliary machine functions.

For procurement engineers sourcing verified NB1-E24X-AC stock, siemensplc.com maintains genuine FUJI Electric inventory dispatched from Xiamen, China, with full export documentation and 12-month warranty coverage.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The NB1-E24X-AC integrates its AC-to-DC power conversion stage within the main housing. An internal switching power supply rectifies and regulates the AC mains input to the logic-level DC voltages required by the CPU core and I/O interface circuitry. This eliminates the ground-loop risk that can arise when a separate external PSU shares a common rail with field devices operating at different potential references.

Input Isolation Architecture: Each of the 14 digital input channels is optically isolated from the CPU bus. Photocoupler devices with a typical forward current threshold of 5–7 mA provide galvanic separation between field-level signals (sensors, proximity switches, pushbuttons) and the internal logic domain. This isolation barrier attenuates common-mode transients — particularly relevant in environments with variable-frequency drives (VFDs) or large inductive loads that generate conducted EMI on the 24 VDC field supply.

Output Stage: The 10 relay contact outputs use mechanical relay switching elements rated at 250 VAC / 2 A per point. Relay outputs provide inherent isolation between the load circuit and the CPU, and they are compatible with both AC and DC load voltages without additional interface hardware. The relay coil drive circuitry includes flyback suppression to protect the output driver transistors from inductive kickback when switching relay coils.

EMC Design: The NB1-E24X-AC carries CE marking under the EMC Directive, indicating compliance with EN 61000-4 series immunity tests including ESD (Level 3), EFT/Burst (Level 3), and surge immunity (Level 3). The PCB layout employs ground plane partitioning to separate the switching PSU noise domain from the CPU and I/O signal domains. Ferrite bead filtering is applied on the communication port lines to suppress high-frequency common-mode noise from RS-232C cable runs.

Program Execution Model: The CPU executes a synchronous scan cycle: input image refresh → program execution → output image write → communication service. The deterministic nature of this cycle — with a basic instruction execution time of approximately 0.2 µs — ensures that control loop latency remains bounded and predictable, a prerequisite for reliable sequencing in conveyor, packaging, and process interlock applications.

Memory Retention: Program and data memory are backed by EEPROM, providing non-volatile retention without a battery. This eliminates battery maintenance overhead and the risk of program loss due to battery depletion — a practical advantage in remote or infrequently serviced installations.

System Integration Benefits

• Simplified panel wiring: Direct AC mains input removes the external 24 VDC PSU from the BOM, reducing terminal block count, wiring labor, and panel footprint by an estimated 15–20% in typical small-machine configurations.
• Deterministic scan cycle: Fixed synchronous execution model with sub-millisecond cycle times ensures bounded response latency for discrete I/O events — critical for interlock and safety-adjacent sequencing logic.
• Broad HMI compatibility: RS-232C port supports FUJI V-series operator panels and third-party HMIs via Modbus RTU, enabling integration into existing HMI infrastructure without protocol converters.
• IEC 61131-3 compliance: Ladder Diagram and Function Block Diagram programming reduces re-engineering effort when migrating logic from other IEC-compliant platforms; existing program libraries can be adapted with minimal modification.
• Relay output versatility: Relay contact outputs switch both AC and DC loads without additional interface relays, reducing auxiliary component count in mixed-voltage panel designs.
• Optical input isolation: Per-channel photocoupler isolation on all 14 inputs prevents field-side transients from propagating to the CPU, improving mean time between failures (MTBF) in electrically noisy environments.
• Battery-free memory retention: EEPROM-backed program storage eliminates periodic battery replacement and the associated maintenance scheduling overhead in distributed or remote installations.
• DIN rail mounting: Standard 35 mm DIN rail compatibility allows direct integration into existing panel infrastructure without custom mounting brackets or enclosure modifications.
• Compact form factor: The approximately 130 × 90 × 75 mm envelope fits within standard compact enclosures, enabling deployment in space-constrained machine cabinets and retrofit panels.
• Wide AC input range: 100–240 VAC acceptance covers both 110 V (North American) and 220–240 V (European/Asian) mains standards, simplifying global deployment without power supply substitution.

Quality Assurance & Global Logistics

Every NB1-E24X-AC unit dispatched by siemensplc.com is sourced as genuine FUJI Electric product. Pre-shipment verification includes label authentication, date-code cross-reference, and a functional power-on check to confirm CPU initialization and I/O status LED operation. Units are packed in anti-static foam-lined cartons with desiccant to prevent moisture ingress during transit.

Shipments originate from our Xiamen, China warehouse. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for each order. Express courier options (DHL Express, FedEx International Priority) deliver to most destinations in Asia-Pacific within 3–5 business days, and to Europe and North America within 5–7 business days. Sea freight consolidation is available for bulk orders. All shipments include full tracking and are covered by the 12-month warranty from the date of dispatch.

For orders requiring additional documentation — such as a Certificate of Conformance, third-party inspection report, or material traceability records — please specify requirements at the RFQ stage. Extended warranty terms beyond 12 months are available upon request for qualified volume accounts.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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