Yokogawa SSC10D Safety Control Unit
The Yokogawa SSC10D-S2111, also cataloged as the SSC10D Duplexed Safety Control Unit, operates as a dedicated hardware component for safety logic execution and deterministic response processing within ProSafe-RS platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SSC10D-S2111 |
| Brand | Yokogawa Electric Corporation |
| Origin | Japan |
| Weight | 8.5 kg |
| Dimensions | Standard 19-inch rack mount chassis |
| Operating Temp | -20 deg C to +60 deg C |
| Power Consumption | 200-290 VA (AC variants), 5.5-7.0 A (DC variants) |
| Architecture | 1oo2D duplex redundancy with dual MIPS R5000 processors |
| Memory Capacity | 32 MB main memory with battery-backed NVRAM |
| System Communication | Dual-redundant Vnet/IP, dual ESB bus interfaces |
| Expansion Limit | Supports up to 9 Safety Node Units and 78 I/O modules per SCS |
| Certification | IEC 61508 SIL3, ISA G3 conformal coating compliance |
4-20 mA HART Loop Protocol & Channel-to-Channel Isolation
The SSC10D-S2111 core logic engine processes field input and output data using dual-redundant Vnet/IP interfaces operating at 100 Mbps. Internal backplane isolation circuits enforce strict channel-to-channel isolation between power distribution lines and logic buses. This prevents field voltage transients on 4-20 mA HART loop protocol instruments from compromising dual-processor diagnostic routines or interfering with lockstep execution cycles across the 1oo2D controller architecture.
Frequently Asked Questions
Q: How does the 1oo2D redundancy structure handle internal diagnostic detection on the SSC10D-S2111?
A: The twin MIPS R5000 CPUs execute identical logic in parallel while internal hardware comparators constantly cross-check execution steps. If one processor reports an internal diagnostic fault, the unit isolates the failed channel and maintains continuous control via the secondary healthy processor.
Q: What battery maintenance cycle applies to the NVRAM data retention circuit?
A: The integrated memory backup battery maintains non-volatile RAM state data during total power outages and requires replacement every 3 years under continuous operation at temperatures below 30 deg C.
Field Installation Guidelines
Mount the SSC10D-S2111 unit securely inside a standard 19-inch instrument rack using M5 panel mounting screws. Connect the dual Vnet/IP network channels using separate, path-redundant Category 5e shielded cables to reduce the risk of simultaneous physical cable cuts. Establish low-impedance frame grounding by bonding the chassis grounding stud directly to the main cabinet ground bar. Maintain adequate thermal clearance around cabinet intake vents when operating in ambient temperatures above 50 deg C to allow internal cooling fans to maintain proper heat dissipation.
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