The Honeywell 900S75S-0360-00 serves as the premier Central Processing Unit for the HC900 Hybrid Control System. This C75S model provides the specialized high-availability logic required for safety-critical and mission-critical process automation. It functions as a dual-port I/O scanner and redundant controller, managing complex PID loops and discrete logic while ensuring instantaneous failover protection. We supply this unit as 100% Brand New and Original, ensuring your safety-instrumented systems (SIS) and critical control loops operate with maximum integrity.
| Attribute | Specification Value |
| Model Number | 900S75S-0360-00 |
| Type | Redundant Controller CPU / I/O Scanner |
| Processor | High-performance Embedded CPU |
| Memory | Integrated RAM + Flash (Non-volatile storage) |
| Redundancy Support | Dual CPU failover / Hot Standby |
| Ports | 2-Port I/O Scanner Architecture |
| Communication | Ethernet (Modbus TCP), RS-485 |
| Operating Voltage | 24 VDC |
| Operating Temp | 0°C to +60°C (32°F to 140°F) |
| Dimensions | 137 x 38 x 137 mm |
| Weight | 0.36 kg (0.8 lbs) |
High-Availability Failover: The 900S75S-0360-00 manages a "Hot Standby" redundancy strategy. In a dual-CPU configuration, the secondary processor tracks the primary's memory in real-time, executing a seamless switchover in milliseconds if the primary unit encounters a fault. This prevents process upsets in continuous chemical or power generation cycles.
Dual-Port I/O Scanning: The 2-port architecture facilitates robust communication with remote I/O racks. This redundancy extends to the network level, allowing the controller to maintain data acquisition even if one communication path experiences a cable break or interference.
Safety-Critical Integration: As a C75S (Safety) variant, this CPU supports safety-related logic execution. It allows engineers to combine standard process control and safety-instrumented functions (SIF) within a single hardware environment, reducing the total cost of safety compliance.
Deterministic Logic Execution: The high-performance processor ensures fixed scan times for both logic and loop control. This deterministic behavior is vital for high-speed manufacturing and turbine control where timing jitter can lead to mechanical vibration or safety shutdowns.
Compact Cabinet Footprint: Despite its redundant capabilities, the module maintains a slim 38mm width. It integrates easily into standard HC900 racks, allowing for high-density safety architectures in space-constrained offshore or modular skid environments.
What is the difference between the 900C75 and the 900S75S-0360-00?
The 900S75S-0360-00 functions primarily as an I/O scanner and redundant CPU module specifically validated for safety and high-availability "S" series systems. It includes specialized firmware for redundant failover synchronization that standard modules lack.
Can I replace a 900S75-0360-00 (Non-S) with this 900S75S-0360-00?
Yes, the "S" version is often the safety-rated equivalent. However, you must verify that your system firmware and the Honeywell Designer software version support Safety/SIL features to utilize the advanced safety diagnostics.
How does the CPU handle program storage during a power loss?
The module utilizes integrated Flash memory to store user programs and configuration data. It retains all logic and setpoints without the need for a battery, ensuring the system restarts immediately once power returns.
Does this unit come with a warranty?
Every 900S75S-0360-00 we sell is Brand New and Original. While factory warranties are subject to manufacturer terms, we provide a 12-to-24 month guarantee on the integrity and performance of the hardware.
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