OMRON CP1E-N40SDR-A PLC CPU Unit – CP1E Series

OMRON CP1E-N40SDR-A: Compact CPU Architecture for Deterministic Discrete Control

The CP1E-N40SDR-A occupies a well-defined position in OMRON’s compact PLC hierarchy: it is the highest built-in I/O variant of the CP1E N-type CPU line, delivering 24 discrete inputs and 16 relay outputs within a single housing powered directly from 100–240 VAC. In control-loop terms, this unit functions as the sole execution engine for ladder-logic programs up to 8,000 steps, arbitrating all I/O scan, communication, and self-diagnostic tasks through a single-chip architecture with a basic instruction cycle of 0.1 μs. For machine builders targeting compact panel footprints without sacrificing I/O density, the N40 variant eliminates the first expansion unit in the majority of SME automation projects.

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Technical Parameters

Hardware Logical Analysis

The CP1E-N40SDR-A is built around OMRON’s single-chip CPU architecture, where program execution, I/O bus arbitration, and peripheral communication are handled by a single processor without a separate co-processor for I/O management. This design choice reduces inter-chip latency and makes scan-time behavior highly predictable — a critical property for relay-sequencing applications where output state changes must align precisely with input transitions.

Relay Output Stage: Each of the 16 output points uses an electromechanical relay with a rated switching capacity of 2 A at 250 VAC or 2 A at 24 VDC. The relay contacts are SPST-NO (normally open), and the mechanical service life is rated at 20 million operations minimum, with an electrical service life of 100,000 operations at rated load. This output topology allows the CPU to switch both AC and DC loads on the same output rail without external interface relays, which directly reduces panel wiring complexity and component count.

Input Circuit Architecture: The 24 input points use optocoupler isolation between the field wiring and the internal logic bus. The input impedance is approximately 3.9 kΩ at 24 VDC, with an ON voltage threshold of 14.4 V minimum and an OFF voltage threshold of 5.0 V maximum. The input filter time constant is software-configurable from 0 ms to 32 ms per input group, allowing the engineer to trade off noise immunity against response speed depending on the sensor type connected.

EMC Design: The CP1E-N40SDR-A carries CE marking under the EMC Directive (EN 61000-6-2 for industrial immunity, EN 61000-6-4 for emissions). The PCB layout employs ground plane segmentation to isolate the relay switching transients from the CPU logic domain. The AC power input section includes an internal line filter to suppress conducted emissions and protect the CPU from line-borne transients up to the levels specified in IEC 61000-4-4 (EFT/Burst, 2 kV) and IEC 61000-4-5 (Surge, 1 kV line-to-line).

Battery-Backed RTC and Memory: Program memory is stored in flash (non-volatile), so no battery is required to retain the ladder program across power cycles. The battery backs only the real-time clock and the DM area (data memory) that the user designates as battery-backed. This architecture means a depleted battery does not cause program loss — only RTC drift and loss of retained data values.

System Integration Benefits

• Deterministic Scan Execution: With a 0.1 μs basic instruction speed and a fixed cyclic I/O refresh model, scan time for an 8,000-step program remains within a predictable window, enabling engineers to calculate worst-case response times for safety-relevant interlocks without empirical measurement on each machine build.
• Dual-Port Communication Without Adapters: The simultaneous availability of USB (programming) and RS-232C (HMI or host link) eliminates the need for a port-switching adapter during commissioning. An engineer can monitor ladder execution via CX-Programmer over USB while the HMI maintains its RS-232C session without interruption.
• Scalable I/O Architecture: The three-unit expansion bus allows the system to grow from 40 to 100 I/O points by adding CP1E Expansion I/O Units. This means the same CPU hardware can serve both the initial machine specification and subsequent feature additions without a CPU replacement.
• AC Power Supply Integration: Direct 100–240 VAC input removes the 24 VDC PSU from the panel BOM in installations where only AC power is available at the cabinet entry point. This reduces panel component count, wiring terminations, and potential failure points.
• Relay Output Load Flexibility: The ability to switch AC and DC loads on the same output module — without external interface relays — simplifies the output wiring design and reduces the number of intermediate relay modules required in mixed-load panels.
• CX-Programmer Ecosystem Compatibility: Full compatibility with OMRON’s CX-One suite means existing engineering teams can reuse function block libraries, structured text routines, and HMI screen projects developed for other CP-series platforms without rewriting application logic.
• Diagnostic Transparency via LED Indicators: The front panel provides dedicated LEDs for PWR, RUN, ERR/ALM, and individual I/O point status. This allows field technicians to diagnose I/O state mismatches and CPU fault conditions without connecting a programming terminal, reducing mean time to repair (MTTR) on the production floor.
• IEC 61131-2 Hardware Compliance: Conformance to the IEC 61131-2 programmable controller hardware standard ensures that the electrical characteristics of inputs and outputs are within defined tolerance bands, simplifying integration with third-party sensors and actuators that specify IEC-compliant PLC interfaces.

Quality Assurance & Global Logistics

Every CP1E-N40SDR-A unit supplied through siemensplc.com is sourced as genuine OMRON product. Prior to dispatch, each unit undergoes a structured pre-shipment verification protocol:

• Authenticity Verification: Label inspection, hologram check, and serial number cross-reference against OMRON’s product identification criteria to confirm the unit is not a counterfeit or refurbished substitute.
• Visual and Mechanical Inspection: Connector pin alignment, PCB surface condition, housing integrity, and DIN rail clip function are checked against acceptance criteria.
• Power-On Self-Diagnostic Confirmation: Where test infrastructure permits, the unit is powered and the CPU self-diagnostic sequence (PWR LED steady, RUN LED active, ERR LED off) is confirmed before packaging.
• Anti-Static and Moisture-Barrier Packaging: Units are sealed in anti-static poly bags with desiccant, placed in foam-lined inner boxes, and packed in double-wall corrugated outer cartons rated for international air freight handling.
• Export Documentation: Commercial invoice, packing list, and certificate of conformity are prepared for each shipment. HS code classification and country-of-origin documentation are provided to support customs clearance in the destination country.

Shipments originate from Xiamen, China, via DHL Express, FedEx International Priority, or UPS Worldwide Expedited. Transit times to major industrial hubs: Europe 3–5 business days, North America 4–6 business days, Southeast Asia 2–3 business days. All shipments include door-to-door tracking and are covered by the 12-month warranty from the date of shipment confirmation.

Contact Information

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