What Is SCADA? Supervisory Control Without Replacing the PLC
SCADA sits above PLCs and RTUs: it acquires field data, alarms operators, and issues supervisory commands across plants and remote assets—without replacing local deterministic control.

Integrating directly into high-availability industrial architectures, the Honeywell FC-IOTA-R24 serves as a robust interface designed to manage redundant input/output module routing. Engineered specifically for safety-critical environments, this redundant I/O termination assembly ensures continuous process execution by handling split redundant signal paths. It provides dependable field-wiring landing points while maintaining strict electrical and physical separation to preserve safety loop integrity.
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model Number | FC-IOTA-R24 |
| Product Type | Redundant IO Termination Assembly |
| Supply Voltage | 24 Vdc (-15% to +30%) |
| Supply Load | Max. 10 A |
| Reverse Polarity Protection | Parallel diode (triggers upstream fuse clearance) |
| Operating Temperature | -40 to +70 degC (-40 to +158 degF) |
| Storage Temperature | -40 to +85 degC (-40 to +185 degF) |
| Relative Humidity | 10% to 95% (non-condensing) |
| Pollution Degree | Pollution degree 2 or better |
| Approvals | CE; UL, TUV pending |
| Dimensions (L x W x H) | 44.32 cm x 12.07 cm x 6.4 cm |
| Net Weight | 0.6 Kg |
| Shipping Weight (Calculated) | 2.0 Kg |
This redundant termination board is designed specifically to interface with compatible safety-certified controller lines. Verify your controller's hardware platform variant and ensure both primary and secondary safety I/O units maintain matching firmware levels to avoid dual-path sync faults.
Keep in mind that the integrated reverse polarity protection utilizes a parallel diode. A reversed input connection causes the diode to short-circuit the supply path to clear the inline fuse. Ensure your power distribution architecture includes appropriate external current limiting to prevent thermal damage to the internal board traces before the external fuse clears.
Keep high-voltage power lines isolated from low-voltage field signal terminations on this board. Maintain solid chassis grounding points to mitigate common-mode noise on the redundant field cables.
CRITICAL WARNING
Isolate and de-energize all primary and redundant 24 Vdc supply lines before mounting or terminating. Verify complete discharge of electrical charges using calibrated instruments before handling. Non-compliance risks equipment failure and personal injury.
Mount the assembly securely inside a dust-free, vibration-isolated cabinet enclosure rated for Pollution Degree 2 or better.
Terminate redundant 24 Vdc power lines, ensuring the polarity is carefully verified and cross-referenced with your wiring schematics.
Connect both redundant I/O module bus cables to the dedicated connection ports and clamp them firmly down to prevent accidental vibration loosening.
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| Country of origin |
United States
|