Name: ABB 3BHE024855R0103 Analog Input Module – 8-Channel UAD AI for Symphony Plus DCS - MASSIVE
SKU: ABB 3BHE024855R0103

ABB 3BHE024855R0103 Analog Input Module – 8-Channel UAD AI for Symphony Plus DCS

Brand ABB

Model ABB 3BHE024855R0103

The ABB 3BHE024855R0103 is an eight-channel universal analog input (AI) module that belongs to ABB’s UAD-series I/O family and is engineered to operate within Symphony Plus distributed control system (DCS) architectures as well as legacy INFI 90 installations. In plain plant terms, the ABB 3BHE024855R0103 is the DCS interface card that tells the controller what the field is actually doing: it receives continuous analog signals from field transmitters—pressure, temperature, flow, level, analyzer outputs and valve position feedback—converts those signals into digital values through a 16-bit analog-to-digital converter per channel, and delivers the resulting process variables to the control processor over the UAD backplane bus. Positioned as a “Basic Module” within the UAD tier structure, the ABB 3BHE024855R0103 deliberately omits HART passthrough and some of the enhanced diagnostics found on premium AI variants, yet retains the 16-bit resolution, ±0.1 % of full-scale accuracy and open-wire detection that satisfy the vast majority of closed-loop control and monitoring points. This makes it the highest-volume AI spare in most Symphony / INFI 90 stores, and the most cost-effective way to preserve measurement integrity without paying for features the loop does not require.

What distinguishes the ABB 3BHE024855R0103 from generic analog input hardware is its software-definable channel architecture. Each of the eight channels can be independently selected as 4–20 mA, 0–20 mA or 0–10 V through the Symphony engineering tool, with no DIP switches and no jumper blocks to configure at the rack. The default 4–20 mA range is established by a precision 250 Ω shunt resistor, while the 0–10 V range presents a high-impedance input of greater than 1 MΩ, so a single card can simultaneously accommodate a 4–20 mA flow transmitter, a 0–10 V position feedback and a 0–20 mA chemical-dose signal. Galvanic isolation of at least 500 V DC is maintained between channels and between channels and backplane, protecting the UAD rack from field-side ground faults and the inductive transients that routinely appear on transmitter loops in power and hydrocarbon plants. For sites extending the lifecycle of 1990s-vintage INFI 90 systems without a full DCS rip-and-replace, the ABB 3BHE024855R0103 is the current-production recommended spare that keeps original function-code logic running unchanged: identical UAD mechanical footprint, identical backplane, identical function-code block mapping—swap the module in, download the parameters, and return the unit to service.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	3BHE024855R0103
Manufacturer	ABB (Hitachi Energy)
Product Type	Analog Input Module, Basic Tier
Series / Platform	UAD Series, Symphony Plus / INFI 90 DCS
Number of Channels	8 (independent, software-configurable)
Input Signal Ranges	4–20 mA, 0–20 mA, 0–10 V
A/D Resolution	16-bit per channel
Measurement Accuracy	±0.1 % of full scale (25 °C reference)
Current Input Impedance	250 Ω precision shunt
Voltage Input Impedance	>1 MΩ
Channel Isolation	≥ 500 V DC (channel-to-channel and channel-to-backplane)
Diagnostics	Open-wire / broken-transmitter detection (current mode)
Configuration Method	Software-defined via Symphony engineering tool (no jumpers)
Mounting	Plugs into UAD baseplate (e.g., UAD140A type)
Operating Temperature	0 °C to +60 °C
Storage Temperature	-40 °C to +85 °C
Relative Humidity	5 %–95 % RH, non-condensing
Protection Rating	IP20 (indoor control cabinet installation)
Typical Dimensions	Approx. 160 × 100 × 30 mm (UAD rack module)
Weight	Approx. 0.25–0.40 kg

Main Features and Advantages

Software-configurable per channel:

Each of the eight channels on the ABB 3BHE024855R0103 can be independently set to 4–20 mA, 0–20 mA or 0–10 V through the Symphony engineering tool. There are no DIP switches, jumper blocks or range cards to handle at the rack, which removes a long-standing source of field wiring errors. A single card can therefore mix a 4–20 mA flow transmitter on channel 1, a 0–10 V position feedback on channel 2 and a 0–20 mA chemical-dose signal on channel 3. Commissioning teams can re-range a point after startup without opening the cabinet or disturbing terminations, and spare holding is cut in half because one part number covers both current-loop and voltage-feedback applications.

Precision acquisition with 16-bit resolution:

The ABB 3BHE024855R0103 converts each input through a 16-bit A/D converter, delivering ±0.1 % of full-scale accuracy at the 25 °C reference and low temperature drift across the 0 °C to +60 °C operating band. The 250 Ω precision shunt establishes the 4–20 mA range with tight tolerance, while the high-impedance voltage input avoids loading the source. The result is measurement headroom that supports tight regulatory loops—analyzer trends, level control in separators, reactor temperature profiles—without the quantization noise that plagues lower-resolution input cards.

Galvanic isolation and transient immunity:

Isolation of at least 500 V DC between channels and between channels and the backplane is a defining advantage of the ABB 3BHE024855R0103. In a power plant or refinery, transmitter loops are long, grounded at arbitrary points and exposed to switching transients from motor starters and thyristor drives. The isolation barrier stops ground-loop currents from corrupting the measurement and prevents a field-side fault from propagating into the UAD rack. Combined with the IP20 industrial enclosure and a conformal-coated PCB, the module is built to survive the humidity, dust and electromagnetic interference of a continuously operating control room.

Built-in open-wire detection:

In current mode, the ABB 3BHE024855R0103 continuously monitors for an open circuit on the transmitter loop and reports it as a diagnostic to the controller. This turns a slowly developing failure—a corroded terminal, a broken lead, a transmitter with a dying power supply—into an alarm that appears while the loop is still readable, rather than a silent 3.6 mA “normal” value that convinces the operator the process is stable while the tank is actually overflowing. It is a small feature with outsized value in hazardous-area and remote-skid applications where a site walk is expensive.

Retrofit sanity and lifecycle economics:

The ABB 3BHE024855R0103 preserves the UAD mechanical footprint, backplane and function-code block mapping of the original INFI 90 installation. Plants running 1990s-vintage control logic can extend service life without rewriting control strategies, retraining operators or re-terminating the I/O cabinet. As the volume AI spare, it is also the most readily available replacement in the secondary market, which matters during a forced outage when a 2 a.m. failure cannot wait for a factory lead time.