IOCHAS-0002S is a standard I/O rack for HoneywellSafety Manager A.R.T. Safety Instrumented System (SIS). Combined with the FS-IOBUS-HB2S horizontal I/O bus board and FS-IOB-0002S I/O backplane, it forms a complete I/O base unit. As a core hardware assembly in industrial safety control systems, it is used for centralized installation, signal switching and power distribution of I/O modules.
Compliant with the 19-inch standard industrial cabinet specification, this rack is designed for non-redundant I/O modules and can hold up to 18 standard I/O modules. Working with the IOBUS-HB2A adapter board, it converts backplane bus signals to the front horizontal I/O bus of the rack. Widely deployed for building compliant industrial safety loops, it features high integration, excellent stability and easy maintenance, and serves as one of the essential accessories for Honeywell SIS.
Product Features
1. Overall Physical and Electrical Parameters
The full model designation of the complete unit is FC-IOCHAS-0002S, a 19-inch standard rack. Overall dimensions: 482.6 mm (19 inches) in width and 280 mm (11 inches) in depth. It adopts the HE industrial height standard. The first I/O rack is 4 HE (133.3 mm) in height, and all extended racks are also 4 HE. The total weight is 8.7 kg (19.2 lb).
Electrically, it is equipped with two independent 5V power outputs: 5V-1 (Slot 20) and 5V-2 (Slot 21), each with a rated current of 100 mA to supply power to I/O modules and circuit boards inside the rack.
2. Functions and Interfaces of Each Component
IOCHAS-0002S I/O Rack
The rack is fitted with a total of 21 module slots (No.1 to No.21). Slots 1 to 18 are for standard input and output I/O modules. Slot 19 is a blank compartment with a built-in IOBUS-HB2A signal adapter board. Slots 20 and 21 are used for installing FC-IO-0002 I/O expansion modules.
The rack is equipped with front and rear covers. The front cover can be flipped upward for easy maintenance of front flat cables. The rear cover is fastened with quarter-turn locking screws for quick removal. Cable clamps are integrated on the rear side to organize all incoming and outgoing cables.
FS-IOB-0002S I/O Backplane
Serving as the foundation for signal transmission and power distribution of the rack, it undertakes physical connections and underlying signal distribution for all I/O modules. It routes power and bus signals for each slot, acting as a core data relay between I/O modules and the system controller. It works in conjunction with the FS-IOBUS-HB2S bus board to realize end-to-end signal transmission.
FS-IOBUS-HB2S Horizontal I/O Bus Board
It integrates 18 flat cable interfaces, corresponding to I/O modules in Slots 1 to 18 one by one. The board is fitted with one 26-pin flat cable assembly and one 10-pin flat cable assembly. Both cables connect to the IOBUS-HB2A adapter board in Slot 19, converting backplane I/O bus signals to the front horizontal bus of the rack and ensuring synchronous and stable transmission of multi-channel I/O signals.
IOBUS-HB2A Signal Adapter Board
Mounted behind the blank panel of Slot 19 and secured by locking screws, it bridges the backplane bus and front horizontal I/O bus. As the signal relay hub of the entire unit, it provides physical channels for signal interaction between the front and rear sections.
3. Environmental and Operational Characteristics
Designed with industrial-grade specifications, the unit is suitable for standard industrial control rooms and on-site cabinet rooms. Its standardized structure supports cascading expansion of multiple racks. All interfaces and circuit boards are marked with anti-misinsertion indicators, and flat cables and connectors adopt unified specifications to reduce wiring errors.
Core Advantages
Modular StructureEach component performs dedicated functions and can be installed or removed independently, including the rack, I/O backplane, horizontal bus board and adapter board. Troubleshooting and replacement of a single faulty part will not require full system shutdown and disassembly, cutting maintenance time.
Stable and Reliable Power SupplyIt adopts dual independent 5V power circuits, each rated at 100 mA and corresponding to Slot 20 and Slot 21 respectively. Zoned power supply minimizes mutual interference between loads.
Optimized Wiring & ProtectionEquipped with dedicated cable clamps, reserved cable routing space and front & rear protective covers. Flat cables are neatly arranged for effective dust prevention and pull resistance, making it adaptable to complex industrial environments.
Global Authoritative CertificationsCertified with CE, UL, CSA and TUV. FM certification is pending approval. It complies with industrial safety access standards of multiple countries and supports deployment for global projects.
Robust Mechanical StructureThe sturdy metal rack is fitted with standard quarter-turn locking screws and anti-loose structures. Loose components and poor interface contact are rarely encountered during long-term operation.
Application Industries
Built for Honeywell Safety Manager safety systems, this complete set of equipment is primarily applied in high-risk industrial sectors with mandatory requirements for production safety and equipment interlocks.
Petrochemical IndustryDeployed in safety instrumented systems for refining units, oil & gas storage and transportation facilities, and chemical reactors to build emergency shutdown, pressure and level interlock loops.
Power IndustryUsed for unit safety interlocks and auxiliary equipment protection in thermal power and gas-fired power plants to ensure stable operation of generator sets.
Pharmaceuticals & Fine ChemicalsProvides safety monitoring and emergency interlock control for explosion-proof workshops and production areas handling hazardous chemicals.
Oil & Gas Exploration and Offshore PlatformsPerforms remote I/O signal acquisition and safety control for onshore oil and gas fields as well as offshore production platforms.
Metallurgy & Building MaterialsImplements equipment safety protection and fault interlocks for high-energy-consuming and high-risk production lines in steel and cement industries.
Municipal UtilitiesServes safety monitoring systems for urban gas transmission and large-scale HVAC systems.
Product Comparison
| Comparison Items | IOCHAS-0002S (Model Introduced) | IOCHAS-0002R (Redundant Rack) |
|---|---|---|
| Positioning | Standard non-redundant I/O rack | Redundant I/O rack, supports redundant configuration of I/O modules |
| Maximum Number of I/O Modules | 18 standalone I/O modules | 9 pairs (18 units) of redundant I/O modules, modules used in pairs |
| Matching Core Boards | FS-IOB-0002S (Standard I/O Backplane), FS-IOBUS-HB2S (Standard Horizontal Bus Board) | FS-IOB-0002R (Redundant I/O Backplane), FS-IOBUS-HB2R (Redundant Horizontal Bus Board) |
| Backplane Interfaces | Basic I/O connectors without redundant signal ports | Additional ports for system interconnection cables, I/O converter modules and multiple external power supplies with richer interfaces |
| Power Supply Design | Dual 5V power supply for basic module power feeding only | Separated internal power (IP) and multiple external power supplies (EP1/EP2/EP3) for more refined zoned power distribution |
| Special Interfaces | No interfaces for system interconnection or redundancy monitoring | Equipped with watchdog ports (WdP1/WdP2) and chassis address DIP switch ports, supporting system redundancy monitoring and custom address setting |
| Application Scenarios | General safety loops, non-critical control points and cost-sensitive projects | High-risk critical processes and applications requiring high continuous operation (e.g. main loops of emergency shutdown systems) |
| Maintenance Complexity | Simple structure with fewer interfaces, low maintenance difficulty | Numerous interfaces and complex redundant links, requiring higher professional skills for maintenance personnel |
IOCHAS-0002S features universal compatibility, cost-effectiveness and easy maintenance, ideal for most conventional safety I/O points. IOCHAS-0002R delivers high reliability and fault tolerance via redundancy, designed for core safety loops. Users may select the appropriate model based on on-site requirements for module redundancy.
FAQ
Q: Does the complete IOCHAS-0002S package include FS-IOBUS-HB2S, FS-IOB-0002S and IOBUS-HB2A by default?A: The factory-standard complete unit FC-IOCHAS-0002S comes pre-assembled with the I/O rack, FS-IOB-0002S backplane, FS-IOBUS-HB2S bus board, IOBUS-HB2A adapter board, as well as matching flat cables and fixing screws. The I/O expansion module (FC-IO-0002) and field I/O modules are sold separately and shall be purchased according to the number of monitoring points.
Q: Is this product compatible with legacy Honeywell Safety Manager systems?A: This hardware is developed exclusively for Safety Manager A.R.T. and backward compatible with older versions of the same series. No additional adapters are required. Please just verify the system firmware version for matching.
Q: Are the product certifications acceptable for project acceptance in domestic chemical and power industries?A: The product holds CE, UL, CSA and TUV certifications and complies with access requirements for domestic industrial safety instrumented equipment, meeting acceptance criteria for most chemical and power projects in China. FM certification is currently pending approval. If FM certification is mandatory for your project, please consult the supplier for updates in advance.
Q: Can the redundant IOCHAS-0002R rack be used as a replacement for IOCHAS-0002S?A: They share the same physical dimensions and mounting structure, so temporary replacement is feasible. However, IOCHAS-0002R adopts a redundant architecture, which will lead to unnecessary cost waste. Besides, pairing non-redundant modules will result in idle slots. Replacement is not recommended for regular applications.
Q: Some I/O modules show communication faults after the rack is powered on. Which parts should be checked first?A: First, check whether the faulty modules are fully inserted into the slots. Second, inspect the 26-pin and 10-pin flat cables between FS-IOBUS-HB2S and IOBUS-HB2A for loose connection or pin oxidation. Finally, measure the power supply voltage of Slot 20 and Slot 21 to ensure it is standard 5V and eliminate unstable power issues.
Q: The rear cover falls off after loosening the quarter-turn locking screws during removal. How to handle it?A: This is a quick-release structure; the cover can be taken off after a quarter turn of the screws. Please hold the cover firmly while turning the screws. Handle the cover gently during daily maintenance to prevent dents and deformation, which may impair sealing and protection performance.
Q: Can the flat cables be replaced separately if the ports on FS-IOBUS-HB2S are damaged?A: Yes. You may replace them with original 26-pin and 10-pin flat cables of the same specification. Non-standard cables are prohibited, as they will cause signal attenuation and communication interference. Power off the device before replacement, and make sure the connectors are fully clipped into place.
Q: Is chassis address setting required when cascading multiple IOCHAS-0002S racks?A: This non-redundant rack has no DIP switches for address configuration. No manual address setting is needed for cascading. The system controller will automatically identify all slot points. Just ensure the bus cables are connected in the correct order.
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