07AI91 Configurable AI Module for Temperature & Voltage Inputs

The 07AI91 analog input module operates as a remote unit on the ABB CS31 system bus.

It provides eight individually configurable input channels arranged in pairs for flexible wiring.

Users can set channels for voltage, current, RTD, or thermocouple measurement via DIP switches.

The module supports thermocouple linearization and constant current excitation for RTD sensors.

Galvanic isolation separates the CS31 bus from field wiring to improve noise immunity.

A full set of LEDs and a test button support real‑time channel status and fault diagnosis.

The module runs on 24 V DC power and includes reverse polarity protection for safe installation.

The 07AI91 is suitable for industrial process monitoring, temperature measurement, and analog signal acquisition.

The 07AI91 features eight analog input channels configurable in channel pairs.

Supported input types include voltage, current, Pt100/Pt1000, and J/K/S thermocouples.

Voltage ranges cover ±10 V, ±5 V, ±500 mV, and ±50 mV with 12‑bit + sign resolution.

Current measurement uses an external 250 Ω resistor for 0–20 mA or 4–20 mA signals.

Pt100 and Pt1000 inputs support linearized measurement from ‑50 °C to +400 °C.

Thermocouple types J (0–1200 °C), K (0–1372 °C), and S (0–1600 °C) include linearization.

Only electrically isolated sensors are compatible with the module inputs.

Input filtering supports 50 Hz, 60 Hz, or no line frequency suppression.

Typical update time is 100 ms with filtering or 30 ms without filtering per channel.

Maximum input overvoltage is ±30 V to protect against wiring faults.

Total error is less than ±0.5% of full scale for most input modes.

Unused channels must be bridged to maintain measurement stability.

The 07AI91 uses a 24 V DC rated supply voltage for operation.

Maximum current consumption is 0.15 A with 3 W maximum power dissipation.

Reverse polarity protection is included on the power input terminals.

Operating ambient temperature ranges from 0 °C to +55 °C.

CS31 bus interface is fully galvanically isolated from field wiring.

Module addressing and channel configuration use DIP switches inside the housing.

Diagnostic functions include self‑calibration and channel fault detection.

The module mounts on a 15 mm DIN rail or via four M4 mounting screws.

Dimensions are 120 mm × 140 mm × 85 mm (width × height × depth).

Removable screw terminal blocks accept conductors up to 2.5 mm².

Net weight of the 07AI91 is 450 grams for standard panel mounting.

Maximum shielded cable length reaches 200 m for analog sensor connections.

Eight green LEDs show channel selection and diagnostic status.

Eight additional green LEDs display analog values for the selected channel.

One red LED indicates general module error or fault conditions.

A test button enables manual diagnostic and display cycling.

LED codes provide detailed status for communication, wiring, and module health.

Mount the 07AI91 on a standard 15 mm DIN rail or secure with M4 screws.

Set the module address and input configurations using the internal DIP switches.

Connect 24 V DC power observing polarity to avoid damage.

Wire field sensors to removable terminal blocks using max 2.5 mm² wire.

Install a 250 Ω external resistor for 4–20 mA or 0–20 mA current inputs.

Configure channel pairs for temperature or voltage mode based on sensor type.

Ground cable shields properly and maintain separation from high‑voltage wiring.

Power on the module and use the test button to verify LED diagnostics.

Ensure unused channels are bridged to prevent erroneous readings.

Confirm isolation and filtering settings match your application requirements.