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Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | AC discrete output module |
| Platform | Modicon Quantum automation platform |
| Number of Outputs | 16 |
| Channel Grouping | 4 groups of 4 channels |
| Output Voltage | 83–253 V AC |
| Supply Frequency | 47–63 Hz |
| Maximum Voltage Drop | 1.5 V |
| Maximum Output Current | 4 A at 85–132 V AC; 3 A at 170–253 V AC per output |
| Maximum Module Load | 16 A RMS |
| Maximum Group Load | 4 A RMS per group |
| Off-State Leakage | 2 mA RMS at 115 V; 2.5 mA RMS at 230 V per output |
| Absolute Maximum Output | 300 V RMS for 10 seconds; 400 V RMS for one cycle |
| Surge Current | Up to 10 A for 3 cycles per point; up to 45 A for one cycle per group |
| Response Time | ≤0.5 ms ON-to-OFF and OFF-to-ON |
| dV/dtdV/dt Rating | 400 V/ms |
| Protection | Internal RC filter; internal output protection by 5 A fuse |
| Fault Indication | Loss of field power; blown fuse |
| Addressing Requirement | 1 output word |
| Local Signaling | Green Active LED; red external-fault LED; 16 green output LEDs |
| Bus Current Requirement | 350 mA |
| Power Dissipation | 1.85+(1.1×Iload)1.85 + (1.1 \times I_{load}) W |
| Operating Temperature | 0 to 60 °C |
| Storage Temperature | −40 to +85 °C |
| Relative Humidity | 95% non-condensing |
| Operating Altitude | Up to 5,000 m |
| Weight | Approximately 0.45 kg |
| Certifications | cUL; FM Class I Division 2; CSA C22.2 No. 142; UL 508 |
Schneider Electric identifies the 140DAO84210 as a 16-output AC discrete module with an 83–253 V AC output range. The published specifications include 4 A per output at 85–132 V AC, 3 A per output at 170–253 V AC, 350 mA bus current, and 0.5 ms maximum response time.
The model was discontinued on December 31, 2022. Some distributors list BMXDAO1605 as a replacement, but that is a Modicon X80 output module and should not be treated as a plug-in Quantum replacement without a migration review.
Product Introduction
The Schneider Electric 140DAO84210 is a 16-channel AC discrete output module for Modicon Quantum PLC racks. It switches 83–253 V AC loads such as contactors, motor starters, solenoid valves, relays, and pilot devices through four groups of four outputs.
Each channel has a status LED, while internal RC filtering and 5 A output protection help control switching transients. Verify the load current, inrush current, group loading, field-power fuse arrangement, and terminal wiring before installing this obsolete Quantum module.
140DAO84210
140DAO84210
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Output LED is OFF and load is OFF | PLC command absent, field power missing, or blown output fuse | ✅ High | Check the PLC output word, measure AC at the field supply, and inspect the red fault LED | Confirm command and field power before replacing the module |
| Output LED is ON but load remains OFF | Open field circuit, blown fuse, loose terminal, or failed output device | ✅ High | Measure voltage at the output terminal and load side while commanded ON | Trace the field circuit; replace the module only if the output terminal does not energize |
| Output remains ON after PLC command turns OFF | Shorted output device, welded external contactor, or failed solid-state channel | ✅ High | Remove the field conductor under safe isolation and measure for residual output voltage | Isolate the circuit and replace the module if the channel remains energized |
| Several outputs fail in one group | Shared field supply, group fuse, or common wiring fault | ✅ Medium to high | Measure field voltage for each output in the affected group and inspect group wiring | Repair the common supply before changing the module |
| Red external-fault LED is active | Loss of field power or blown fuse | ✅ High | Measure the field supply and inspect the module’s output protection circuit | Correct the field supply or replace the module after confirming the fuse fault |
| Output trips when a contactor energizes | Excessive inrush, short circuit, or load above rating | ✅ High | Measure coil resistance and inrush; compare load current with the 3 A/4 A rating | Use an interposing relay or suppressor when required; do not exceed the output rating |
| Output flickers or chatters | PLC logic, voltage drop, EMI, or unstable field supply | ✅ Medium | Monitor the command bit and AC voltage at the output under load | Correct logic, wiring, or suppression before replacing the card |
| Output fuse repeatedly blows | Shorted load, incorrect wiring, or excessive surge current | ✅ High | Isolate the load and perform a controlled insulation and resistance check | Repair the load circuit; never bypass the internal or external protection |
| Module overheats | Excessive total current, group overload, or poor ventilation | ✅ High | Calculate per-output, per-group, and total module current; inspect ambient temperature | Reduce load or redesign switching; replace the module if thermal damage is visible |
| PLC sees output ON but LED is dark | LED fault, backplane issue, or module logic fault | ✅ Medium | Compare the PLC output word, LED state, and measured terminal voltage | Investigate the module and backplane before replacement |
| New module does not operate correctly | Wrong voltage class, incompatible terminal block, or configuration error | ✅ High | Confirm the exact model, output range, wiring, and Quantum slot configuration | Stop testing if the voltage class is wrong; verify the complete part number |
| Output fails after replacing a 24 V DC card | Application or wiring mismatch | ✅ High | Check the field voltage against the 83–253 V AC specification | Use the correct AC module; do not apply DC loads without compatibility confirmation |
This module switches hazardous AC loads and can retain dangerous voltage at field terminals. Use lockout/tagout, discharge connected loads, and follow the Quantum installation procedure before testing or removal. If the issue persists, contact technical support with the output word, LED pattern, measured load voltage, load current, fuse condition, and terminal-wiring photos.
Frequently Asked Questions (FAQ)
What voltage does the 140DAO84210 switch?
The specified output range is 83–253 V AC at 47–63 Hz. The per-output current rating is 4 A at 85–132 V AC and 3 A at 170–253 V AC. Do not select this card for 24 V DC or standard low-voltage DC loads.
How are the 16 outputs grouped?
The module has four groups of four channels. The maximum group load is 4 A RMS, and the total module load is limited to 16 A RMS. Check both the individual output current and the group total when sizing contactors, solenoids, and other loads.
Does the 140DAO84210 use relay outputs?
The published data identifies it as an AC discrete output module with solid-state output characteristics, including off-state leakage, voltage drop, dV/dtdV/dt, RC filtering, and internal fuse protection. Do not assume zero leakage or mechanical relay isolation when selecting the load.
Is the 140DAO84210 still manufactured?
Schneider Electric lists the model as discontinued on December 31, 2022. Remaining units may be available as Factory Sealed old stock, New Surplus, or Refurbished and Tested inventory.
Is BMXDAO1605 a direct replacement?
No. BMXDAO1605 is associated with the Modicon X80 platform. A migration may require a new rack, power supply, terminal arrangement, wiring changes, I/O addressing changes, and application validation. Do not install it as a direct Quantum plug-in substitute based only on output count.
Can I hot-swap the 140DAO84210?
Do not assume hot swapping is allowed. The field terminals may carry up to 253 V AC, and connected loads can generate hazardous energy. Isolate the rack and field supply unless the specific Quantum installation procedure and site controls explicitly authorize live replacement.
What should I verify before ordering?
Confirm the full part number, output voltage, frequency, per-channel current, group loading, terminal block, hardware revision, and condition. Request current photos, a channel-by-channel AC load test, LED and external-fault test results, warranty terms, and return conditions.
Why is surplus stock cheaper than a factory replacement?
The unit is obsolete and may come from discontinued inventory, opened packaging, or refurbished/tested stock. Lower price does not prove equivalence or condition. For this module, ask whether the seller tested outputs under load and checked the internal protection behavior—not merely whether the card powers up.
