Description
Core Product Summary (Brand / Model / Key Attributes)
The MTL F860-CA is the unpopulated IOTA (I/O Termination Assembly) carrier for the F860 8-segment redundant fieldbus power system. It is designed specifically for use with Honeywell Experion “Series C” 4-link Fieldbus Interface Modules (FIMs).
The carrier accepts two power modules (F801 or F802) operating in a redundant configuration to supply power to eight FOUNDATION fieldbus H1 segments. The F860-CA itself is a passive interconnect assembly that mounts in the standard 11.6-inch Honeywell Series C channel and provides the mechanical and electrical interface between the power modules, the host system, and the fieldbus segments.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product type | Unpopulated IOTA carrier for redundant fieldbus power |
| System | MTL F860 8-segment redundant fieldbus power system |
| Host compatibility | Honeywell Experion “Series C” 4-link FIM |
| Number of segments | 8 FOUNDATION fieldbus H1 segments |
| Power modules supported | F801 or F802 (two modules for redundancy) |
| Mounting format | 11.6-inch IOTA (Honeywell Series C channel) |
| Carrier nature | Passive (interconnections only) |
| Isolation | Fully isolated segment outputs (via power modules) |
| Alarm facility | Remote alarm interface |
| Diagnostics option | Compatible with F809F Fieldbus Diagnostics Module |
Detailed Product Overview
The F860-CA forms the mechanical and electrical backbone of the MTL F860 redundant fieldbus power system. It is a passive IOTA carrier that installs directly into the Honeywell Experion Series C mounting channel and provides the interconnection between two plug-in power modules and the eight fieldbus segments.
When populated with a pair of F801 or F802 power modules, the system delivers redundant, isolated power to eight FOUNDATION fieldbus H1 segments. The dual-module arrangement ensures continued operation of all segments if one power module fails. Each power module incorporates its own replaceable anti-surge fuse.
The F860-CA is deliberately designed as a passive assembly containing only interconnections. This approach maximises long-term reliability by minimising active components on the carrier itself. The carrier supports the optional F809F Fieldbus Diagnostics Module for continuous on-line monitoring of segment health.
Power module output ratings are:
- F801: approximately 21.5–24 V DC, up to 350 mA per segment
- F802: approximately 28–30 V DC, up to 500 mA per segment
Input power to the system is 19.2–30 V DC. Segment-to-segment and fieldbus-to-input isolation is provided by the power modules.
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
|---|---|---|
| Host system | Honeywell Experion “Series C” 4-link FIM | Designed specifically for this platform |
| Power modules | Two F801 or two F802 modules | Required for redundant operation |
| Diagnostics | Optional F809F module | Provides continuous segment health monitoring |
| Mounting | Honeywell Series C 11.6-inch IOTA channel | Direct fit |
| Input power | 19.2–30 V DC | Supplied to the power modules via the carrier |
| Field connections | Eight FOUNDATION fieldbus H1 segments | Isolated outputs |
F860-CA
F860-CA
Engineering Selection Highlights
- Dedicated carrier for Honeywell Experion Series C 4-link FIM systems.
- Supports full 8-segment redundancy with two power modules (F801 or F802).
- Passive IOTA design improves long-term reliability by eliminating active components on the carrier.
- Standard 11.6-inch IOTA format for direct mounting in Honeywell Series C channels.
- Fully isolated segment outputs.
- Remote alarm interface for system-level fault indication.
- Optional F809F diagnostics module for on-line segment monitoring.
- Compact, high-density layout suitable for space-constrained cabinets.
Dimensions, Mounting & Connection Notes
The F860-CA follows the standard Honeywell 11.6-inch IOTA mechanical format and is secured to the Series C mounting channel with M3 screws. Power modules plug into the carrier; fieldbus segment connections and system power connections are made via the carrier terminals. Exact mechanical drawings, mounting screw locations, and terminal assignments are provided in the official MTL F860 instruction manual (INM F860).
FAQ
What is the MTL F860-CA?
It is the unpopulated IOTA carrier for the MTL F860 8-segment redundant fieldbus power system, designed for Honeywell Experion Series C applications.
Does the F860-CA include power modules?
No. The F860-CA is the passive carrier only. It must be populated with two F801 or two F802 power modules to form a complete redundant power system.
How many fieldbus segments does it support?
Eight FOUNDATION fieldbus H1 segments with full redundancy when two power modules are installed.
Is it compatible with Honeywell Experion Series C?
Yes. It is specifically designed for use with Honeywell Experion “Series C” 4-link Fieldbus Interface Modules and mounts in the standard 11.6-inch IOTA channel.
What is the difference between F801 and F802 modules?
F801 modules provide approximately 21.5–24 V at up to 350 mA per segment. F802 modules provide approximately 28–30 V at up to 500 mA per segment.
Can diagnostics be added?
Yes. The optional F809F Fieldbus Diagnostics Module can be used with the F860 system for continuous on-line monitoring.
Verification & Troubleshooting Notes
Confirm that the correct power modules (F801 or F802) are installed and that both modules are of the same type for balanced redundancy. Verify that the input supply is within 19.2–30 V DC and that all segment wiring is correctly terminated.
Check the remote alarm contacts and, if fitted, the F809F diagnostics module for fault indication. Refer to the official MTL F860 instruction manual for fuse replacement procedures, LED status interpretation, and detailed wiring diagrams. Ensure the carrier is securely mounted in the Honeywell Series C channel before applying power.
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