OMRON ZEN-20C1DR-D-V1 – Programmable Relay CPU Unit | ZEN Series Micro PLC
Engineering Background
The OMRON ZEN Series was engineered to bridge the gap between traditional timing relays and full-scale PLCs. Designed for compact machine control, the ZEN-20C1DR-D-V1 delivers reliable logic execution in space-constrained panels where a standard PLC would be over-specified. It is the preferred choice for OEM machine builders, panel integrators, and maintenance engineers who require deterministic relay-based control without complex programming environments.
Product Positioning
The ZEN-20C1DR-D-V1 is a 20-point I/O CPU unit with relay output, operating on 12 VDC supply. It supports ladder-diagram programming via the front-panel LCD/button interface or ZEN Support Software, making it ideal for small automation tasks such as sequential control, timer/counter applications, and simple interlocking logic in industrial and building automation environments.
Complete Technical Specifications
| Model Number | ZEN-20C1DR-D-V1 |
| Brand | OMRON |
| Series | ZEN (Programmable Relay) |
| Product Type | CPU Unit (Programmable Relay) |
| Power Supply Voltage | 12 VDC |
| Total I/O Points | 20 Points |
| Input Points | 12 Inputs |
| Output Points | 8 Outputs |
| Output Type | Relay Output |
| Input Voltage | 12 VDC |
| Program Capacity | 96 rungs (ladder diagram) |
| Internal Relay | 36 bits |
| Timer / Counter | 16 timers / 16 counters |
| Display | Built-in LCD (2 lines × 12 characters) |
| Programming Method | Front-panel buttons or ZEN Support Software (USB) |
| Communication Port | USB (via optional cable) |
| Expansion Capability | Up to 3 expansion I/O units |
| Dimensions (W×H×D) | Approx. 90 × 90 × 56 mm |
| Weight | Approx. 300 g |
| Operating Temperature | 0 to 55°C |
| Storage Temperature | -20 to 70°C |
| Humidity | 10% to 90% RH (non-condensing) |
| Protection Rating | IP20 (front panel) |
| Mounting | DIN rail or surface mount |
| Certifications | CE, UL, cUL |
| Country of Origin | Japan |
| RoHS Compliance | Yes |
Proven Application Environments
- Conveyor & Material Handling: Sequential start/stop control with interlocking and timer-based delays.
- HVAC & Building Automation: Fan/pump scheduling, temperature-based switching, and alarm logic.
- Packaging Machinery: Cycle counting, reject logic, and batch control for small-scale lines.
- Water Treatment: Level-based pump control and dosing timer sequences.
- Agricultural Equipment: Irrigation scheduling and sensor-triggered relay switching.
- Panel Retrofit Projects: Direct replacement for legacy timer/relay banks with minimal rewiring.
Engineering Advantages
- No PC Required for Programming: Full ladder logic can be entered and modified directly via the front-panel LCD and buttons — critical for field commissioning.
- Compact DIN-Rail Footprint: 90 mm wide housing fits standard 35 mm DIN rail, minimizing panel real estate.
- Relay Output Robustness: Dry-contact relay outputs handle resistive, inductive, and lamp loads without additional interface relays in most applications.
- Expandable Architecture: Up to 3 ZEN expansion units can be added, scaling I/O to 44 points without changing the CPU.
- Integrated LCD Display: Real-time monitoring of I/O status, timer/counter values, and custom operator messages directly on the unit.
- Low Power Consumption: 12 VDC operation suits battery-backed or solar-powered remote installations.
System Architecture & Signal Flow
The ZEN-20C1DR-D-V1 follows a standard scan-cycle architecture:
- Input Sampling: All 12 DC inputs are read simultaneously at the start of each scan cycle.
- Program Execution: Ladder rungs (up to 96) are evaluated left-to-right, top-to-bottom using the sampled input image.
- Output Refresh: Relay coil states are updated at the end of each scan; relay contacts switch accordingly.
- Display & Communication: LCD updates and USB communication are handled asynchronously without interrupting the control scan.
Expansion I/O units connect via the right-side expansion bus connector, extending the input image and output image tables transparently to the CPU program.
Sourcing & Quality Verification
- OEM Authenticity: All ZEN-20C1DR-D-V1 units sourced by Konmask.com are genuine OMRON products procured through authorized distribution channels.
- Inspection Protocol: Each unit undergoes visual inspection, label verification (date code, lot number), and power-on functional check prior to dispatch.
- Traceability: OMRON factory serial numbers and date codes are preserved and available upon request for warranty and maintenance records.
- Packaging: Shipped in original OMRON anti-static packaging with all factory accessories (terminal cover, instruction sheet).
- Warranty: 12-month warranty against manufacturing defects; DOA replacement within 30 days of receipt.
Procurement Process
- Inquiry: Submit your BOM or part number to support@konmask.com or via the product page for volume pricing and lead-time confirmation.
- Quotation: Receive a formal quotation within 1 business day including unit price, shipping cost, and estimated delivery.
- Order Confirmation: Place order via the Konmask.com checkout or by proforma invoice for bank transfer.
- Dispatch: Orders confirmed before 14:00 CST are typically dispatched same day. Tracking number provided within 24 hours.
- Delivery: Standard international shipping 5–12 business days; express options (DHL/FedEx) available at checkout.
- After-Sales: Technical support available via email or WhatsApp for installation, wiring, and programming queries.
Technical FAQ
Q: Can the ZEN-20C1DR-D-V1 operate on 24 VDC?
A: No. The -D suffix designates 12 VDC supply. For 24 VDC operation, specify the ZEN-20C1DR-A-V1 (AC/DC) or ZEN-20C1DR-D-V2 variants.
Q: What programming software is compatible?
A: OMRON ZEN Support Software (Windows). The unit can also be fully programmed without a PC using the front-panel buttons.
Q: Is the ZEN-20C1DR-D-V1 discontinued?
A: The ZEN V1 series has been superseded by V2 in some markets, but V1 units remain available as new-old-stock (NOS) and are fully supported. Konmask.com maintains stock for MRO and retrofit applications.
Q: Can I connect this to OMRON CX-Programmer?
A: No. CX-Programmer is for OMRON CJ/CS/CP series PLCs. The ZEN series uses its own dedicated ZEN Support Software.
Q: What is the maximum relay output current?
A: 8 A per output point (resistive load), 2 A per output point (inductive load, cos φ = 0.4).
Q: Are expansion units included?
A: No. The ZEN-20C1DR-D-V1 is the CPU unit only. Expansion I/O units (e.g., ZEN-8E1AR, ZEN-8E1DR) are sold separately.
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