Point I/O Mounting Base Unit: Allen-Bradley 1734-MB for 1734 Series I/O

Technical Specifications

Main Features and Advantages

Modular and Expandable Foundation: The core advantage of the Allen-Bradley 1734-MB​ is the unparalleled flexibility it provides as the building block of the Point I/O system. Each base supports a customized pair of modules, allowing users to mix and match communication adapters (EtherNet/IP, DeviceNet, etc.) with any compatible I/O module (digital, analog, specialty) to create a tailored I/O station. This modularity prevents users from paying for unused I/O points. Multiple 1734-MB​ bases can be seamlessly connected side-by-side on a DIN rail to form a rack of any size, with modules communicating over the continuous POINTBUS created by the inter-base connectors. This allows for easy field expansion; new I/O points can be added by simply inserting another 1734-MB​ base with the required module, without replacing an entire chassis or rewiring a backplane.Simplified Installation and Maintenance: The 1734-MB​ base significantly reduces panel wiring time and cost. Its removable, pluggable terminal blocks allow all field device wiring to be completed and checked beforethe electronic modules are installed. This enables parallel work processes during panel build. The clear, marked terminals and the base’s transparent design facilitate easy wire identification. For maintenance, if an I/O module fails, a technician can simply unplug the faulty module from the Allen-Bradley 1734-MB​ base and plug in a replacement without touching any field wiring, dramatically reducing mean-time-to-repair (MTTR). The integrated design also consolidates wiring: field power, logic power, and network connections (for some adapters) are all terminated directly to the base, resulting in a clean, organized panel layout. The 1734-MB​ transforms I/O from a fixed, chassis-based system into a modular, component-based one, offering unparalleled adaptability, serviceability, and space efficiency for control panel design.

Application Field

The Allen-Bradley 1734-MB​ mounting base is employed wherever the Allen-Bradley Point I/O system is specified, which is across virtually all discrete and process manufacturing industries. Its primary application is within control panels and enclosures for machine-level control. Machine builders extensively use the 1734-MB​ to create compact, customized I/O racks for packaging machinery, CNC machines, assembly robots, and material handling systems. The ability to start with a small, cost-effective station (one 1734-MB​ with an adapter and an 8-point I/O module) and expand it as machine options are added is a key benefit for OEMs. In larger systems, rows of 1734-MB​ bases form distributed I/O panels located near specific machine sections, such as a hydraulic power unit or a tool changer, reducing long home-run conduit and wiring.In process skids and modular systems, such as those used in water treatment, chemical batching, or oil & gas, the Allen-Bradley 1734-MB​ enables the creation of self-contained I/O sub-panels that are pre-wired and tested before being shipped to site. The base’s support for a wide range of I/O types—including analog, temperature, and serial—makes it suitable for these hybrid control applications. Furthermore, it is used for facility and building automation to create local I/O hubs for HVAC control, lighting, and access systems. Any application that benefits from a modular, scalable, and panel-mounted I/O solution that simplifies wiring, eases troubleshooting, and allows for future modifications is an ideal candidate for the Point I/O system built upon the 1734-MB​ mounting base.