๐ฆ Product Overview
The HONEYWELL 51402599-100 is a 15-Slot SIOM Backplane Rack System used as an I/O rack assembly in legacy Honeywell industrial control systems. The assembly is identified with 51401618-100 Rev. D and is also described as a 15-I/O File or 15-Slot SIOM Backplane.
This assembly provides the physical rack and backplane structure for installing compatible Honeywell I/O modules. Available system references show it used with digital input, digital output, high-level analog input, and other SIOM-related modules.
The referenced unit is listed as Used, with an approximate weight of 15.6 kg. Because the rack can be associated with different module configurations and revisions, the installed module complement should be checked before using it as a complete system replacement.

๐ง Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Honeywell |
| Model / Assembly No. | 51402599-100 |
| Product Type | 15-Slot SIOM Backplane Rack System |
| Associated Model | 51401618-100 |
| Backplane Revision | Rev. D |
| System Description | 15-I/O File / 15-Slot SIOM Backplane |
| Associated System | Honeywell / Yamatake-Honeywell industrial control system |
| Rack Capacity | 15 I/O positions |
| Related Rack Reference | 51402598-100 Rev. A |
| Associated Rack Assembly | JS-IOFX02 / 80364413-001 |
| Compatible I/O References | Digital Input, Digital Output, High-Level Analog Input and related SIOM modules |
| Country of Origin | Japan |
| Approx. Weight | 15.6 kg |
| Condition | Used |
The 15-slot capacity, Rev. D identification, 51402598-100 reference, JS-IOFX02 / 80364413-001 association, Japan origin, and 15.6 kg weight are supported by available listings and product records.
โ๏ธ Key Features
- 15-slot SIOM backplane rack configuration
- Designed for Honeywell legacy I/O system architecture
- Identified by assembly number 51402599-100
- Associated with 51401618-100 Rev. D
- Provides mounting and backplane connections for multiple I/O modules
- Supports mixed I/O configurations depending on the installed system
- Related to the Honeywell JS-IOFX02 / 80364413-001 I/O file assembly
- Suitable as a replacement or maintenance spare for an existing rack
- Heavy-duty industrial rack construction
The available system examples show the rack populated with modules such as digital input, digital output, high-level analog input, and redundant digital input/SOE hardware.
๐ญ Typical Applications
The 51402599-100 is intended for legacy Honeywell control-system installations where multiple I/O modules need to be mounted and interconnected through a common rack/backplane.
Typical applications include:
- Process control systems
- Industrial automation
- Plant I/O systems
- Legacy Honeywell control installations
- Distributed I/O cabinets
- Industrial process monitoring
- Digital and analog signal acquisition
- Maintenance and spare-parts replacement
For an installed system, the rack should be matched with the existing I/O module types, firmware/hardware revisions, wiring, and system architecture.
๐ Identification References
When checking this part against an existing Honeywell installation, the following markings can be useful:
- 51402599-100
- 51402598-100 Rev. A
- 51401618-100 Rev. D
- JS-IOFX02
- 80364413-001
- 15-I/O File
- 15 SIOM Backplane
- FW-17-97
The references above can appear together within the same rack assembly. They should not automatically be interpreted as separate replacement part numbers.
โ Frequently Asked Questions
Q1: What is the HONEYWELL 51402599-100?
It is a 15-Slot SIOM Backplane Rack System / 15-I/O File assembly used for mounting and interconnecting compatible Honeywell I/O modules.
Q2: Is 51401618-100 the same as 51402599-100?
They are closely associated identification numbers within the same rack assembly. Available records identify 51402599-100 as the 15-Slot SIOM Backplane assembly and 51401618-100 Rev. D as the associated 15-I/O File/backplane reference.
Q3: How many I/O positions does the rack have?
The assembly is identified as a 15-slot / 15-I/O SIOM backplane rack.
Q4: Does the rack include I/O modules?
The exact contents depend on the individual assembly. Some available configurations are sold with installed I/O modules and cables, while the basic 51402599-100 identification refers to the backplane/rack assembly. Confirm the actual contents of the supplied unit before ordering.
Q5: What is the approximate weight?
The referenced 51402599-100 rack is listed at approximately 15.6 kg. Other configurations containing additional modules and cables can weigh considerably more.
Q6: Is this a standalone PLC or controller?
No. It is a rack/backplane assembly. The actual control and I/O functions are provided by the modules installed in the rack.
๐ Related Honeywell References
The following references are associated with this rack family or configurations documented with the 15-Slot SIOM system:
- Honeywell 51402599-100 โ 15-Slot SIOM Backplane
- Honeywell 51401618-100 โ 15-I/O File / Backplane System Assembly
- Honeywell 51402598-100 โ Associated 15-I/O rack reference
- Honeywell JS-IOFX02 โ I/O File assembly reference
- Honeywell 80364413-001 โ Associated I/O File reference
- Honeywell 51304485-100 โ Digital Input Assembly
- Honeywell 51304487-100 โ Digital Output Assembly
- Honeywell 51304754-150 โ High-Level Analog Input Assembly
- Honeywell 51402625-125 โ Redundant Digital Input/SOE Assembly
- Honeywell 51309152-175 โ Analog Output Assembly
These are related rack or I/O component references, not confirmed direct substitutes for 51402599-100. Compatibility depends on the complete Honeywell system configuration.
๐ Compatibility & Ordering Notes
For replacement applications, verify the following before purchasing:
- Assembly No.: 51402599-100
- Associated backplane/file: 51401618-100 Rev. D
- Rack capacity: 15 I/O positions
- Rack revision
- Installed I/O module types
- Module hardware and firmware revisions
- Connector and cable arrangement
- Existing JS-IOFX02 / 80364413-001 configuration
- Physical condition of the backplane and rack
A particularly important point is that 51402599-100 should not be selected only by appearance. Different listings show the same basic rack family with different installed modules, revisions, and cable configurations.
For the referenced item, the condition is Used and the listed rack weight is approximately 15.6 kg.






