The Honeywell FC-IOTA-R24 51306505-175, also cataloged as the 51306505-175 Redundant IO Termination Assembly, operates as a dedicated hardware component for safety-critical signal processing and fault-tolerant network interfacing within Safety Manager and Experion PKS control architectures. The unit accepts dual-redundant Safety Universal I/O modules, routing 32 universal channel signals directly from field junction devices through to central processing buses.
Hardware Specifications
Parameter
Specification
Model
51306505-175
Brand
Honeywell
Origin
USA
Weight
0.56 kg
Dimensions
44.2 cm x 12 cm x 6.5 cm
Operating Temp
-20 to 70 deg C
Power Consumption
12 W
Safety Integrity Level
SIL 3 compliant (IEC 61508/61511)
Channel Capacity
32 Universal I/O channels (CN1, CN2)
Ethernet Ports
2 x RJ45 (100MB RIOLA/RIOLB)
Fail-Safe Architecture and Galvanic Isolation
engineered to execute fail-safe state operations in high-integrity process safety loops, the FC-IOTA-R24 incorporates triple-modular-redundant and dual-channel isolation paths certified for SIL 3 deployment. High-density channel-to-channel isolation prevents field loop surges or transient ground loops from propagating to active processing logic. Dual RJ45 Ethernet communication lines (RIOLA and RIOLB) maintain deterministic, 100MB redundant network links between field termination points and control processors, ensuring seamless transfer during module failure.
Frequently Asked Questions
Q: Can RUSIO-3224 or RUSLS-3224 modules be replaced on the FC-IOTA-R24 while the assembly is energized? A: Yes. The dual-connector layout supports hot-swapping a single faulted I/O module while the redundant partner card continues executing safety function logic without process interruption.
Q: What power terminals are utilized to supply field transmitters on this assembly? A: Active analog input field devices receive loop power via four dedicated V+ connection terminals (CN3), bonded directly to the 24 VDC carrier power rail.
Field Installation Guidelines
Mount the assembly onto the carrier rail structure using the designated 24V screw and COM screw power terminal landings.
Verify that instrument ground cables are securely clamped to the earthing bar before connecting any 100MB Ethernet cables to the RIOLA and RIOLB RJ45 ports.
Wire the 32 universal field signal leads into terminal connectors CN1 and CN2, maintaining 5 full thread engagements on all screw terminals.
Route field input wiring through separate cable channels, keeping signal cables isolated from high-voltage AC power lines by at least 200 mm to avoid electromagnetic noise.
Ensure active transmitter power loops are connected directly to terminal block CN3 for 24 VDC power distribution.
