A Purpose-Built Termination Platform for Mission-Critical I/O Connectivity

The FC-IOTA-R24 (part number 51306505-175) is a redundant Input/Output Termination Assembly engineered by Honeywell for the Experion PKS distributed control system and the Safety Manager platform, making it a vital component for industrial automation and process control systems. Designed to serve as the physical interface between field devices and the control system, this assembly mounts directly onto a carrier within the control cabinet and accommodates two redundant I/O modules – specifically the RUSIO-3224 or RUSLS-3224 universal I/O modules. The FC-IOTA-R24 provides 32 universal I/O channels and establishes redundant power, communication, and ground paths, ensuring that signal integrity is maintained even if one module or pathway experiences a fault. For process engineers and instrument technicians working in power generation, oil and gas, chemical processing, or other continuous process industries where reliable automation spare parts and control components are essential, this assembly offers a standardized, field-proven method for achieving SIL-capable I/O terminations.

Robust Technical Specifications for Demanding Industrial Environments

The FC-IOTA-R24 is built to withstand the extreme conditions commonly encountered in heavy industrial automation settings. Its operating temperature range spans –40 °C to +70 °C (–40 °F to +158 °F), with storage capability extending from –40 °C to +85 °C (–40 °F to +185 °F), and relative humidity tolerance from 5% to 95% non-condensing. The assembly accepts a 24 Vdc supply with a tolerance of –15% to +30%, supporting a maximum load of 10 A. Reverse polarity protection is provided via a parallel diode that safely blows the on-board 10 Amp, 58V blade fuse in the event of incorrect wiring. The physical dimensions are compact at 64 mm in height, 120.7 mm in width, and 443.2 mm in depth, with a net weight of approximately 0.57 kg (1.26 lbs). Field wiring connects through Weidmuller screw-terminal blocks on CN1 and CN2, supporting wire diameters from 0.50 to 2.50 mm² with a strip length of 7 mm. A dedicated V+ distribution terminal (CN3) provides up to 1 Amp total across four pins for powering active analog input devices, simplifying field wiring and reducing the need for external power distribution components – a key advantage for automation and control components integration. The assembly also features an RJ-45 Ethernet port for communication with higher-level systems, and carries CE, UL, and TUV approvals, with pollution degree 2 rating.

Seamless Integration into Honeywell Safety and Process Control Architectures

The FC-IOTA-R24 is specifically designed for deployment within Honeywell's Experion C I/O system and Safety Manager / FSC safety system architectures, making it a cornerstone of machinery protection and distributed protection systems. It supports both redundant and non-redundant module configurations, with two power switches (POWER 1 and POWER 2) for independent control of each redundant power path. The assembly is mounted on an 18-inch carrier (FC-MCAR-01) and typically paired with two FC-PSU-UNI2412 power supplies and a PSU shelf (FC-PSUTA-0001) to form a complete, self-contained I/O subsystem. For network connectivity, the system includes an Ethernet switch (MOXA EDS-305-S-SC-HPS or similar) and a pre-terminated Ethernet cable set (FC-CCI-HSE-08). In safety instrumented applications, the FC-IOTA-R24 supports SIL 3 compliance according to IEC 61508/61511 when integrated with appropriately certified I/O modules and logic solvers. This makes it suitable for emergency shutdown systems, burner management, and fire and gas detection applications where functional safety is paramount – essential for online condition monitoring and process control strategies. The assembly also includes two ESD wrist straps and an ESD wristlet as standard accessories, reflecting the electrostatic-sensitive nature of the components and the importance of proper handling during installation and maintenance.

Recommended Model

If you want to know details，please contact me without hesitate.

sales6@apterpower.com