Omron CJ1W-OC201 — 8-Pt Independent Relay Output, 2 A
SKU: CJ1W-OC201USD 55.00
CJ-series 8-point independent-relay output unit, 250 VAC / 24 VDC 2 A per contact, 16 A per unit total. Each output has its own isolated COM contact — supports mixed AC + DC loads on the same unit without common-bus issues.
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Product Overview
The CJ1W-OC201 is Omron's 8-point independent-relay output unit for the CJ-series PLC platform — the right pick when you need to switch 8 different loads on 8 different voltages (or mixed AC and DC) from the same I/O unit without common-bus wiring complications.
Decoding the CJ1W-OC201 model number
CJ1W = CJ-series expansion I/O; OC = Contact (relay) output; 2 = independent-relay contacts (vs 1 = shared-common contacts); 0 = 8 points (vs 1 = 16 points). So OC201 = 8-pt independent-relay output. Sibling models in the CJ contact-output family: CJ1W-OC211 (16-pt shared-common 2 A relays, the workhorse choice), CJ1W-OA201 (8-pt triac AC-only output, 0.5 A per point, for solid-state AC switching), CJ1W-OC223 (16-pt high-density with Fujitsu connector). Note that 'independent' means each output has its own isolated COM — this is also called 'Form A' or 'SPDT-per-channel' architecture.
Independent contacts vs shared common — when each matters
The OC201's independent architecture lets you wire outputs 0-7 to 8 completely different loads. Example: output 0 drives a 230 VAC solenoid valve; output 1 drives a 24 VDC brake relay; output 2 drives a 120 VAC indicator; output 3 grounds a 5 VDC open-collector sensor's load; etc. All on the same unit, with each load on its own return. With the OC211's shared-common architecture, all 16 relays would have to be on the same supply voltage (because they all share COM), limiting you to either all-24-VDC or all-120-VAC mixed with the same COM.
Relay specs — NY-24W-K-IE from Fujitsu Takamizawa
Each contact is a sealed NY-24W-K-IE relay manufactured by Fujitsu Takamizawa Components, Ltd., and factory-installed and non-replaceable per the Omron datasheet ('Cannot be replaced'). Service life is 150,000 electrical operations at 24 VDC resistive, 100,000 electrical at 250 VAC inductive (cosφ=0.4), and 20,000,000 mechanical operations. Minimum switching load is 1 mA at 5 VDC (for low-current signal switching). ON response time is 15 ms max; OFF response time is 15 ms max — suitable for valve control and motor contactor signaling, NOT suitable for high-speed pulse outputs (use CJ1W-OD212 transistor output for >50 Hz signals).
Key Features
- CJ-series 8-point relay output unit
- Independent isolated contacts — each output has its own C/NO/NC triple
- Mixed AC and DC load capability on the same unit
- Rated 2 A 250 VAC / 24 VDC per contact
- Rated 2 A 250 VAC inductive for contactor / solenoid coil driving
- Maximum switching capacity 16 A per unit total
- Minimum switching load 1 mA at 5 VDC
- NY-24W-K-IE relay
- SKU: CJ1W-OC201
- Series: CJ1W I/O Basic Units (CJ-series expansion I/O)
- Voltage: 250 VAC
- I/O: 8 I/O
Best-Fit Applications
- Mixed-voltage control panel for a chemical process skid — output 0 drives a 230 VAC solenoid valve; output 1 a.
- Pneumatic valve manifold driver — 8 outputs each wired to a 24 VDC single-solenoid 5-port pneumatic valve at 50 mA.
- Motor contactor signaling — output drives a 230 VAC motor contactor coil directly, with 2 A peak inrush and 50.
- Indicator-light stack output — 5 of the 8 outputs wired to a 24 VDC tower light each at 100 mA.
Buying Checklist
- Pick CJ1W-OC201 for 8-pt INDEPENDENT-relay output — when you need mixed AC + DC loads on the same unit
- Pick CJ1W-OC211 for 16-pt SHARED-COMMON relay output — workhorse pick when all 16 relays use the same voltage
- Pick CJ1W-OA201 for 8-pt TRIAC AC-only solid-state output — for high-cycle AC loads where mechanical relay bounce is a problem
- Pick CJ1W-OD211 for 16-pt NPN SINKING transistor output — for high-speed pulse outputs
- Pick CJ1W-OD212 for 16-pt PNP SOURCING transistor output — for direct 24 VDC solenoid / valve driving at high speed
- Pick CJ1W-OC223 for 16-pt Fujitsu-connector relay output — when field-side quick-disconnect is required
Technical Specifications
| Model | CJ1W-OC201 |
|---|---|
| Series | CJ1W I/O Basic Units (CJ-series expansion I/O) |
| Type | 8-point independent-relay output, removable terminal block |
| Output Points | 8 points |
| Contact Configuration | SPDT (Form C) × 8 — each with isolated C/NO/NC terminals |
| Independent Contacts | YES — each output is fully isolated (no shared common) |
| Max Switching Voltage | 250 VAC, 24 VDC (per point) |
| Max Switching Current | 2 A per point (resistive); 2 A per point (cosφ = 0.4 inductive) |
| Max Unit Current | 16 A per unit total |
| Max Inrush Current | 5 A continuous per output (no inrush derating per datasheet) |
| Internal Current Consumption | 110 mA at 5 VDC (from CJ bus) |
| Mounting | CJ-series DIN-rail mount, occupies one slot on CJ bus |
| Operating Temperature | 0 to +55 °C |
| Storage Temperature | -20 to +75 °C |
| Certifications | CE, cULus listed, UL 508, KC, NK, Lloyd's Register |
Resources & Downloads
FAQ for CJ1W-OC201
What's the difference between CJ1W-OC201 and CJ1W-OC211?
Both are CJ-series relay output units rated 2 A 250 VAC / 24 VDC, but they differ in contact architecture: CJ1W-OC201 (this SKU) has 8 outputs with fully independent isolated contacts — each output has its own C/NO/NC terminal triple, allowing mixed AC and DC loads on the same unit. CJ1W-OC211 (done previously) has 16 outputs sharing ONE common bus — all 16 relays must be on the same supply voltage.
How do I suppress surge on inductive loads connected to CJ1W-OC201?
The CJ1W-OC201 has no internal surge suppression across the relay contacts — when you switch off an inductive load (solenoid coil, contactor coil, motor winding), the collapsing magnetic field induces a back-EMF (hundreds of volts for 230 VAC coils, ~50 VDC for 24 VDC coils) that pits or welds the contacts.
Can I replace the relays on CJ1W-OC201 if they fail?
No — per the Omron datasheet, the NY-24W-K-IE relays in the CJ1W-OC201 are 'Cannot be replaced.' The relay is sealed into the unit and is factory-installed by Omron. When a relay fails (typically after 150,000+ electrical operations on inductive loads, or instantly if the user forgot the flyback diode across a 24 VDC solenoid), the entire CJ1W-OC201 unit must be replaced.
Can the CJ1W-OC201 switch 24 VDC and 230 VAC loads on the same unit?
Yes — that is the primary reason for picking the CJ1W-OC201 over the CJ1W-OC211. Wire each output to its own isolated load, with the C (common) terminal returning to that specific load's supply common (24 VDC ground for DC loads, neutral for AC loads). The internal relay isolation is 2000 VAC between the CJ bus and each output contact, so cross-talk between outputs sharing the same unit is essentially zero (assuming no wiring errors).
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