Modicon Quantum AC Output Modules: 140DAO Models Compared by Voltage and Current
The “DAO” in a 140DAO part number means AC discrete output. The first thing to check is the voltage range. One 140DAO module switches 20 to 56 V AC. Another switches up to 253 V AC. They look the same on the rack, but they are not interchangeable.
An output that won’t switch stops a valve, a starter, or a whole conveyor. You need the right module on the first order. This guide compares four common Modicon Quantum AC output modules side by side.
Why 140DAO Modules Get Mixed Up
All four modules below are standard-format Quantum modules. They slot into the same rack and draw about the same bus current. The differences are in what they can safely switch:
- Output voltage range
- Number of outputs
- How channels are grouped
- Current per output
Order by the family name alone and you can end up with a module that can’t handle your load voltage.
140DAO Modules Compared
| Spec | 140DAO84010 | 140DAO84220C | 140DAO84210 | 140DAO85300 |
|---|---|---|---|---|
| Outputs | 16 | 16 | 16 | 32 |
| Output voltage | 20 to 132 V AC | 20 to 56 V AC | 85 to 253 V AC | 20 to 253 V AC |
| Channel grouping | 16 isolated, 1 each | 4 groups of 4 | 4 groups of 4 | 4 groups of 8 |
| Max current per output | 4 A rms | 4 A rms | 3 A (170 to 253 V), 4 A (85 to 132 V) | 1 A rms |
| Max current per module | 16 A rms | 16 A rms | 16 A rms | 16 A rms |
| Fuse | 5 A fuse rating listed | 5 A internal | 5 A internal | 4 A internal |
| Fault indication | Not listed | Loss of field power, blown fuse | Loss of field power, blown fuse | Not listed |
| Bus current draw | 350 mA | 350 mA | 350 mA | 320 mA |
Figures come from the published specifications on each product page. Confirm against Schneider’s datasheet for your exact revision.
1. Match the Voltage Range to Your Load
This is the number that matters most. Look at the voltage on the load, not the voltage you assume is there.
- 24 V or 48 V AC control circuits: the 20 to 56 V AC module fits
- 115 V AC loads: several modules cover it
- 230 V AC loads: you need a module rated up to 253 V
A module rated for a lower range can’t be used on a higher-voltage load. Don’t try it.
2. Check Current Per Output and Per Module
Every module here has a 16 A rms limit across the whole module. That is the real ceiling.
The 140DAO85300 has 32 outputs but only 1 A per output. Running all 32 at their limit would be 32 A, which is twice what the module allows. Add up your actual load before you assume you can use every point.
3. Check Channel Grouping Before You Rewire
Grouping decides how your field wiring lands on the terminals.
- 140DAO84010: each channel is isolated on its own
- 140DAO84220C and 140DAO84210: 4 groups of 4 channels
- 140DAO85300: 4 groups of 8 channels
Swapping between grouping styles can mean new commons and new wiring. Check this before the module arrives, not after.
4. Don’t Buy a DAO Module for a DC Load
DAO modules switch AC. If your load runs on 24 V DC, you need a DC output module. DC output modules use the DDO prefix, like the DDO-series DC output module.
This is one of the most common ordering mistakes on Quantum racks.
5. Buy a Module That Has Been Tested
Ask the supplier whether the module has been powered on and tested under load, not just inspected. Check that the fuse and fault LEDs work, since those are your main troubleshooting tools later.
For exact specs by revision, Schneider Electric’s own Modicon Quantum documentation is the best source.
Frequently Asked Questions
Q: Why does my load stay faintly on when the output is off? A: AC output modules leak a small current in the off state. The published figures include 1 mA at 24 V and 2 mA at 115 V on the 140DAO84010, and 2.5 mA at 230 V on the 140DAO84210. Small loads like indicator lamps or sensitive relays can react to that.
Q: Can I use a 140DAO module for 24 V DC loads? A: No. DAO modules are AC output modules. For DC loads, use a DDO-series DC output module.
Q: How much can the whole module switch at once? A: All four modules in the table are limited to 16 A rms per module. Each group is also limited to 4 A rms, so spread your loads across groups.
Q: How do I tell a blown fuse from a dead output? A: Modules like the 140DAO84220C and 140DAO84210 indicate blown fuse and loss of field power. Check those indicators and the fuse before replacing the module.
Matching Modicon Quantum AC output modules comes down to four checks: voltage range, current per output, channel grouping, and AC versus DC. Confirm all four against the table above before you order.
