The 1794-IE8 belongs to Rockwell Automation’s FLEX I/O high‑density analog module family and is used with FLEX I/O adapters (ControlNet, EtherNet/IP, DeviceNet, etc.) to build distributed analog input systems. It offers 8 single-ended analog inputs, all sharing a common reference, and operates from a 24 V DC field power supply, drawing its logic power from the FLEXBus (Flex I/O backplane).
Each channel supports configurable input ranges of 0–20 mA, 4–20 mA, 0–10 V DC, and ±10 V DC, making the module suitable for a mix of typical process instruments and drive signals. The A/D converter provides 12-bit resolution in unipolar mode and 11-bit plus sign in bipolar mode, with an effective conversion rate of about 256 µs per channel and nominal resolution of roughly 5.13 µA per count for current signals. The module is specified as single-ended, non‑isolated, so all inputs share a common return; if channel‑to‑channel isolation is needed, other FLEX I/O models must be used.
It is designed for use with FLEX I/O terminal bases including 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, and 1794-TB3TS, which provide screw terminals for field wiring of current and voltage inputs. The module’s enclosure is open‑style, IP20, DIN‑rail mountable, with front indicators for module OK, power, and channel fault/status, enabling quick diagnostics in the field. FLEXBus current consumption is about 60 mA, and the module requires 24 V DC field power (from a FLEX power supply such as 1794-PS13 or class 2 source) for input circuitry.
Typical applications include reading 4–20 mA transmitters, 0–10 V and ±10 V signals from drives and controllers, and other analog process signals into PLC or PAC systems via FLEX I/O adapters, especially where panel space is limited and a modular, distributed I/O approach is desired.
