Product Description for B&R 7AI351.70 Analog Input Module

7AI351.70 is a single-channel screw-in analog input submodule developed exclusively for the B&R System 2003 automation control platformB& R Industrial Automation. It is designed to be plugged into the slots of the 7AF104.7 high-speed adapter base, converting standard industrial analog signals from field transmitters into digital signals and transmitting processed measurement data to System 2003 host CPUs via the platform’s proprietary internal backplane busB& R Industrial Automation. Manufactured in Austria, the module holds CE and UL/cULus industrial safety certifications for global factory deployment. The entire System 2003 hardware series has been officially marked end-of-life by B&R headquarters; available inventory includes original factory-sealed new units and fully inspected refurbished modules for legacy production line maintenance, equipment retrofits and emergency spare part replacement projects. Built-in high-frequency filter and multi-layer protection circuits guarantee stable signal acquisition in electrical cabinets with heavy interference from inverters, servo drives and contactors.

The official part number is 7AI351.70, classified as a universal single-channel analog input screw-type submodule for the 7AF adapter base architecture under System 2003B& R Industrial Automation. The module is delivered as a standalone body without pre-assembled wiring terminals, connecting cables or mounting fittings; a separate 12-pin terminal block is a mandatory accessory for field wiring connectionB& R Industrial Automation. Two terminal block options are available: 7TB712.9 screw-clamp type and 7TB712.91 cage-clamp type, both supporting 1.5 mm² cable conductorsB& R Industrial Automation. Permanent laser etching on the rear plastic housing displays B&R brand logo, full part number, hardware revision code, unique serial number and production batch code to realize full production traceability and authenticity verification. Power is supplied through the matched 7AF104.7 adapter base from the System 2003 24 V DC backplane bus, with fixed power consumption of only 0.3 W for long-term continuous operation. The net weight of one unit is roughly 0.1 kg, with slim dimensions to occupy exactly one slot of the four-slot 7AF104.7 adapter base. For cross-border customs clearance, it is categorized under industrial PLC analog signal acquisition subcomponents. Compact LED indicators on the front shell provide real-time visual prompts for module power supply and channel fault status to simplify on-site troubleshooting.

The core function of 7AI351.70 is high-precision conversion of analog field signals into digital data readable by System 2003 control logicB& R Industrial Automation. It supports two mainstream industrial signal formats: ±10 V differential voltage and 0–20 mA loop current signals output by pressure transmitters, flow sensors, temperature transducers and displacement measuring devicesB& R Industrial Automation. The internal filter circuit features a 225 kHz cutoff frequency and 60 dB noise attenuation capacity, effectively suppressing high-frequency electromagnetic interference and avoiding measurement fluctuation and signal distortion during closed-loop process control. Converted digital measurement values are synchronously uploaded to the host CPU to support closed-loop regulation, fault alarm triggering via threshold comparison, real-time value display on compatible 7AI261 series touch HMIs, and historical process data logging. Multiple 7AF104.7 adapter bases can be installed on one System 2003 backplane, with each base accommodating up to four 7AI351.70 modules to flexibly expand total analog input channel quantity according to system design demands. Vacant rack bus expansion slots without adapter bases are sealed by 7AC020.9 bus covers to maintain cabinet dustproof performance and rack structural stability. All parameter settings including signal range selection, scaling coefficients, filter intensity and fault thresholds are configured and downloaded uniformly through B&R Automation Studio software connected to the System 2003 CPU; no manual hardware trimming or calibration is required directly on the module itself.

This analog input module is equipped with one fully differential input channel with selectable signal ranges of ±10 V DC voltage and 0–20 mA DC loop currentB& R Industrial Automation. The analog-to-digital converter adopts 12-bit resolution with sign bit to deliver stable and accurate measurement results for general industrial monitoring and precision closed-loop control. Built-in protection circuits provide defense against overvoltage, overcurrent and reverse polarity wiring faults to prevent permanent module damage caused by field installation misoperations. The flame-retardant reinforced plastic housing meets IP20 ingress protection rating, and the module is only allowed to be installed inside enclosed indoor electrical control cabinets. The continuous stable operating ambient temperature range is 0 °C to +60 °C; storage and transportation temperature tolerance extends from -25 °C up to +70 °C for warehouse storage and international logistics transit. Gold-plated rear insertion contact pins ensure low-resistance, vibration-resistant electrical connection with 7AF104.7 adapter base slots, adapting to 24/7 non-stop factory operation under mechanical vibration from processing equipment. There is no independent local firmware storage on the module; all operation logic and configuration parameters are remotely managed by the System 2003 host CPU through the high-speed internal backplane bus. The matched terminal blocks realize tool-free reliable wiring without requiring on-site soldering of sensor cables.

7AI351.70 is exclusively compatible with the B&R System 2003 hardware ecosystem and cannot be mechanically or electrically interchanged with analog submodules from X20, X67, APC, ACOPOS or other newer B&R product platforms. It can only be inserted into the four standard slot openings of the 7AF104.7 high-speed analog adapter base as a dedicated screw-in submodule. It works compatibly with the full range of System 2003 supporting hardware: 7CP series PCC CPU controllers, digital input/output modules, 7AI294.7 potentiometer analog submodules, 7AC911.9 CAN bus communication connectors, 7AC020.9 blank bus slot covers and 7AI261 series color touch HMI panels. No extra mounting brackets, power transformers or external signal isolators are needed for standard assembly; tool-free plug-in installation greatly reduces on-site assembly time. Shielded twisted-pair sensor cables are highly recommended for field wiring to further weaken electromagnetic interference in high-noise workshop environments. The mandatory supporting accessories are 7TB712.9 screw terminal blocks or 7TB712.91 cage-clamp terminal blocks, which must be purchased separately for connecting field transmitters to the moduleB& R Industrial Automation. When distributed multi-station CAN bus networking is needed for long production line layouts, 7AC911.9 bus connectors are installed at communication module positions on the same rack backplane.

This universal analog input submodule is only deployed in automation control stations built on the B&R System 2003 PCC architecture. Major discrete manufacturing application equipment includes plastic injection molding machines, packaging and filling production lines, textile spinning and weaving looms, CNC metal cutting machine tools, commercial offset printing presses and automated assembly machinery that require collection of multi-type analog sensor signals. It also supports auxiliary process control systems for food and beverage processing equipment, municipal water treatment pump stations, automated material conveyor positioning systems and small hydraulic or pneumatic actuator closed-loop regulation loops. Installation is limited to IP20-rated indoor electrical cabinets inside factory workshops and sheltered semi-outdoor machinery housings. It is not suitable for direct deployment in environments with corrosive chemical vapors, persistent high humidity, flammable explosive hazardous atmospheres or fully exposed outdoor locations unless equipped with additional fully sealed upgraded protective cabinet enclosures.

Genuine original 7AI351.70 modules have unique serial numbers recorded in B&R official production archives to achieve complete traceability. Since the System 2003 platform has reached official end-of-life status, product supply mainly relies on authorized global industrial spare part distributors. Refurbished analog input modules undergo strict multi-stage pre-delivery testing, including insertion contact continuity inspection, full voltage and current channel accuracy calibration, filter performance verification, communication stability testing with the 7AF104.7 adapter base, and LED fault indicator function validation. Refurbished units are normally covered by supplier warranty periods ranging from 12 to 24 months. Standard on-site commissioning steps include inserting the module into a vacant 7AF104.7 slot, mounting the separate matching terminal block, wiring field analog sensors, and uploading configuration parameters via Automation Studio software. Disassembly of internal circuit boards or unauthorized manual hardware calibration adjustments are strictly prohibited during installation and maintenance. Long-term storage must be arranged in dry, temperature-stabilized warehouses to prevent plastic casing embrittlement and oxidation of metal contact pins and terminal screws. During equipment maintenance replacement, field technicians must fully verify compatibility with the System 2003 platform and 7AF104.7 adapter base to avoid mismatches with incompatible newer generations of B&R control hardware architectures.