Omron F3SG-SR replacement / compare DQC
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Parameters, accessories, wiring compatibility. An engineering checklist for assessing replacement of Omron F3SG-SR safety light curtains with DAIDISIKE DQC series. We map resolution / protective height / range, outline bracket swaps, and give a functional comparison for determining what cabinet changes and validation are required.
1) Quick equivalence (template)
Use the light-curtain selection by series to find candidates before mapping the F3SG-SR functions. The DQC catalogue and output caveats require exact-build confirmation; a Type 4/PL-rated replacement is not established by this article.
The table is a verification template, not an equivalence approval. Omron’s F3SG-SR specifications separately list detection capability, beam gap, operating modes and safety functions. Match those requirements to evidence for the exact proposed DQC build.
| Use case | Omron F3SG-SR (example) | DAIDISIKE DQC (example) | Resolution / PH | Range (typ.) | Notes |
|---|---|---|---|---|---|
| Finger protection | F3SG-SR -14: declared 14 mm detection capability | Exact build with declared detection capability required | Match actual active height and access geometry | Compare documented operating modes | Do not equate the DQC 10 mm pitch label with 10 mm detection |
| Hand / larger-object detection | F3SG-SR includes -25, -45 and -85 variants | Candidate requires detection and safety evidence | Choose by risk assessment, not nominal pitch | DQC 0.3–3 m standard; 0.3–6 m custom | No DQC-30/DQC-40 order-code equivalence is established |
| Constrained mounting envelope | Use exact F3SG-SR dimension drawing | Catalogue 30 × 30 mm body | Verify active field and physical length separately | Recheck after approved accessories | A 30 × 17.5 mm DQC option is not established here |
2) Electrical compatibility (OSSD + EDM + reset)
Terminal roles (normalize first, then map)
- OSSD1/OSSD2 → dual input channels on safety relay/controller.
- Reset → monitored reset input of the approved safety architecture; use the actual terminal diagram.
- EDM feedback → series NC contacts from contactors K1/K2.
- Aux/diagnostic → to PLC for status only (non-safety).
// Functional example only; terminal numbers are not a DQC/F3SG-SR pin map
TX/RX (curtain)
OSSD1 ─► IN_CH_A (safety relay)
OSSD2 ─► IN_CH_B (safety relay)
RST PB ─► documented monitored reset input
Documented EDM test source ─► K1 mirror NC ─► K2 mirror NC ─► EDM input
Use the specified mirror/positively-guided feedback contacts and exact device circuit
Safety switching outputs → approved final switching elementsFunctional cross-check (not a pin map)
| Function | F3SG-SR naming | DQC naming | Notes |
|---|---|---|---|
| Power | 24 VDC supply; wiring selects PNP/NPN | Confirm exact supply and suffix | Compare actual pinouts and bonding instructions |
| OSSD channel A | OSSD1 | Confirm independently monitored output availability | Check test pulses and safety-input acceptance |
| OSSD channel B | OSSD2 | Confirm independently monitored output availability | No bridge or ordinary single-channel substitution |
| Reset | RESET/EDM input and configured interlock | Determine whether function is in sensor or safety logic | Y1/Y2 is not a universal DQC terminal assignment |
| EDM | RESET/EDM function, configured per manual | Confirm sensor/controller feedback architecture | Check contactor feedback and reset inhibition |
| Auxiliary output | Configurable auxiliary outputs | Confirm availability and wiring | Diagnostic outputs do not replace safety outputs |
3) Mechanical fit: body, holes & brackets
If the existing unit is an F3SJ rather than an F3SG-SR, use the F3SJ legacy mount and bracket checks; the subseries drawings and accessories must be identified before reuse is assessed.
Body envelopes
- F3SG-SR: select the exact sensor and bracket dimension drawings.
- DQC: catalogue body is 30×30 mm; verify the window datum and actual protective height.
- For tall PH, add mid-span support to limit vibration.
Bracket swaps
- Side L-bracket ↔ rear T-slot sliders (fast pitch adjust).
- End-cap brackets: keep loads axial; respect torque limits.
- Adapter plates can reuse legacy hole patterns.
Clearance & optics
- Meet the device-specific minimum distance from reflective sheet or glass; generic tilt angles are not a safety rule.
- Use each cable’s specified minimum bend radius and strain relief.
- Re-verify S (distance) after any shift of optical centerline.
4) Accessories mapping (illustrative)
| Category | F3SG-SR typical | DQC counterpart | Remarks |
|---|---|---|---|
| Mounting | Exact F3SG-SR bracket kit | Approved bracket set for selected build | Compare dimension drawings; no universal interchange |
| Covers / hoods | Approved accessory for exact sensor | Request supported accessory list | Check transmission, range and reflective clearance |
| Cables | Model-specific root / extension cables | Confirm core count, pinout and length limits | Matching connector shape does not establish compatibility |
| Alignment | Model indicators and supported alignment aids | Use documented indicators and approved aids | Validate the complete field after mounting |
5) Commissioning & records (copy pack)
Checklist
- Verify supply, PE, and channel polarity; separate OSSD looms.
- Verify feedback-fault reset inhibition using the approved safe test method; do not hold live contactors by hand.
- Calculate S = K×T + C with measured T_total (sensor, logic, final switching elements and measured mechanical stopping time, without double counting).
- Take photos: mounting, bracket torque, cable routing, controller parameters.
- Archive the prescribed test-piece results for the exact detection capability and configured functions.
CSV templates
Item,Test,Expected,Actual,Result,Notes
1,OSSD behavior,Both channels reach safe state within exact model timing and diagnostic limits,,,
2,EDM feedback-fault simulation,Reset inhibited by approved safe test,,,
3,Reset behavior,Configured reset and restart rules verified against device manual and risk assessment,,,
4,Safety distance,Full applicable positioning method and measured total stopping time verified,,,
5,Docs,Photos + parameter printouts archived,,,
6) FAQ
Can I reuse the original safety relay/PLC?
Only after verifying the exact input/output interface, test pulses, polarity, response time, diagnostic behavior and required PL/SIL. A suitable safety PLC may execute the safety function; an ordinary PLC may monitor status but cannot replace the validated safety logic.
What if my F3SG-SR used muting/blanking?
Identify each enabled function before choosing a replacement. Muting needs a validated safety implementation; blanking changes the sensor's detection behavior and cannot generally be recreated by masking a binary OSSD in an external controller. Do not assume the candidate supports either function.
Are cables pin-to-pin compatible?
No pin-to-pin equivalence is established here. Compare both exact wiring diagrams, connector pin assignments, supply, polarity and allowable loads. Map functional roles before commissioning; do not infer pin positions from labels such as OSSD or EDM.
Brand names such as Omron and F3SG are the trademarks of their respective owners and are used here only for nominative comparison and compatibility reference. DAIDISIKE is not affiliated with, authorized by, or endorsed by these companies. Specifications are taken from each manufacturer's own public datasheets; confirm every replacement against the original unit's datasheet and a fresh ISO 13855 calculation for your machine.