ASCO 5140 connectivity module
Register map(s) for this device, each at the trust rung it earned. Addresses are 0-based
as on the wire. Word order and scaling are confirmed at the hardware-verified rung and at no rung below it.
interop-verified
Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.
| point | address (0-based) | type | scale | unit |
|---|
| line_to_line_voltage_ab | 16 | U16 | 1 | V |
link settings as documented (unverified): TCP; Modbus/TCP is always enabled. Default TCP port is 10001. Default IP address is 169.254.1.1.
bench facts as documented (unverified)
| terminals | Power terminal plug provided |
| connector | RJ-45 |
| wiring notes | DIN mount vertical. Ports: 2 (yellow stripe) for ASCO devices, 4 (blue stripe) for Ethernet. Dimensions: 4" x 5" x 2" (4 cm, 11 cm, 10 cm) |
| protocol notes | The Modbus register map is the same as that of the downstream device. The 5140 QEM maps the Modbus data using the downstream device address. |
| power | 24 V dc, 1.7 W |
| environment | -4° F to 158° F (-20° C to +70° C) |
| doc revision | 381333-417 D |
⚠ disputed: Modbus/TCP is always enabled — disputed by newer manual revision 381333-459 D, which states that Modbus/TCP is default disabled and must be manually enabled [3.4.2]
⚠ disputed: Default TCP port is 10001 — disputed by newer manual revision 381333-459 D, which states that TCP Port 1 defaults to 502 for Modbus/TCP, while Port 2 defaults to 10001 for ASCOBusII/TCP
field reports — community-sourced, unverified (checked 2026-06-11)
- The manual contains a metric conversion typo for dimensions: '4” x 5” x 2” (4 cm, 11 cm, 10 cm)' where 4 inches is incorrectly converted to 4 cm, and 2 inches is incorrectly converted to 10 cm. [source]
- In newer firmware versions (documented in manual 381333-459 D), Modbus/TCP is disabled by default and must be manually enabled, and the default port changes to 502. [source]
- confirmed: Modbus/TCP is always enabled in revision D — confirmed by ASCO 5140 Installation Manual 381333-417 D [1.4.1]
- confirmed: Default TCP port is 10001 in revision D — confirmed by ASCO 5140 Installation Manual 381333-417 D
- confirmed: Default IP address is 169.254.1.1 — confirmed by ASCO 5140 Installation Manual 381333-417 D and Schneider Electric support
- confirmed: Power requirements are 24 V dc, 1.7 W — confirmed by ASCO 5140 Installation Manual 381333-417 D
- confirmed: Dimensions are listed as 4" x 5" x 2" (4 cm, 11 cm, 10 cm) — confirmed by ASCO 5140 Installation Manual 381333-417 D
- confirmed: The Modbus register map is the same as that of the downstream device — confirmed by ASCO 5140 Installation Manual 381333-417 D
- confirmed: line_to_line_voltage_ab is at 0-based address 16 (1-based 40017) — confirmed by ASCO 5140 Installation Manual 381333-417 D
The trust ladder
Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.
- generated — A prompt produced it. Unproven — anyone can regenerate this.
- structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
- interop-verified — Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.
- simulator-verified — Decoded correctly against a protocol emulator seeded with known-true values — catches word-order/scaling errors vs the emulator, not the physical device.
- hardware-verified x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.