ASCO 5140 connectivity module
Register map(s) for this device, with a note of how far each has been checked. Addresses are
0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.
cross-referenced (demoted: under-extracted stub (<=3 regs); needs re-extraction (#52))
Imported from a third-party source and NOT verified by us — not even structure-checked. An unverified claim, shown so you can find the device; trust it no more than the source it came from.
| 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.
- coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
- hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.