Technical Specifications​

Eight analog input channels. Universal input accepts RTD, thermocouple, mV, mA and voltage without hardware jumpers. Per-channel cold-junction compensation for thermocouples. A/D conversion twenty-four-bit sigma-delta with programmable gain amplifier. Input isolation through digital isolators and isolated DC-DC converters. Sensor break and short-circuit detection with configurable alarm. Digital filtering and linearization per channel. Hot-swap support with automatic configuration restore where the system permits. Supply 24 V DC. Conformal-coated FR-4 PCB with 70 µm copper. Pluggable screw terminals, nickel-plated brass. DIN-rail mount. Front LEDs for power, communication and channel status.

Functional Features​

Software-configured input type per channel. Cold-junction compensation for thermocouple inputs. Built-in open/short diagnostics. Linearization for standard RTD and thermocouple curves. Removable terminal block with finger-safe cover. Conformal coating for humidity, dust and corrosive environments.

Application Scenarios​

Reactor, furnace and heat-exchanger temperature monitoring. Pressure, flow and level acquisition from 4–20 mA transmitters. Test-bench and environmental-chamber multi-sensor logging. Process skids and OEM machinery requiring flexible analog I/O.

Performance Parameters​

Twenty-four-bit sigma-delta conversion. Universal 8-channel input. Per-channel CJC and diagnostics. Isolated input and backplane communication. 24 V DC module supply.

Material Composition​

Flame-retardant ABS/PC blend housing where specified. FR-4 PCB with acrylic conformal coating. Nickel-plated brass screw terminals. Sigma-delta ADC with PGA. Digital isolators and isolated power stages.

Structural Characteristics​

DIN-rail I/O module with grouped channel terminals. Keyed backplane connector. Front status LEDs and channel label strip. Removable finger-safe terminal block.

Working Principle​

Each input passes through a programmable gain amplifier and anti-alias filter. The sigma-delta ADC digitizes the conditioned signal. The microcontroller applies gain, linearization, cold-junction compensation and filtering, then transmits scaled engineering values through the isolated backplane or fieldbus interface.

Installation Requirements​

Mount on 35 mm DIN rail in a ventilated enclosure. Use shielded twisted-pair cable for all analog inputs and ground the shield at the controller end. Use thermocouple extension wire matching the thermocouple type. Keep analog wiring at least 200 mm from AC power and VFD cables. Verify stable 24 V DC supply with low ripple.

Usage Precautions​

Do not apply more than ±30 V to any input channel. Configure each channel input type before field wiring. Use three-wire or four-wire RTD for highest accuracy; two-wire introduces lead resistance error. Calibrate periodically or after extreme environmental exposure. Isolate live field signals before removing or inserting the module if hot-swap is not enabled by the host system.