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Description
Yokogawa SSC10S Safety Control Unit
The Yokogawa SSC10S-S2121, also cataloged as the SSC10S Safety Control Unit, operates as a dedicated hardware component for safety logic execution, redundant communication processing, and I/O management within the ProSafe-RS Safety Instrumented System over the V net architecture. The unit functions as the processing core of a Safety Control Station (SCS), supporting dual-redundant processor, network, and power configurations.
Suffix Breakdown & Model Matrix
Suffix
Description
-S
Standard temperature type, passive convection cooling, operating temperature -20 degC to 50 degC
-F
Wide-range temperature type, integrated fan cooling, operating temperature -20 degC to 70 degC
SSC10S-S
Standard version, approximate weight 7.9 kg
SSC10S-F
Fan-cooled version, approximate weight 13.0 kg
Hardware Specifications
Parameter
Specification
Model
SSC10S
Brand
Yokogawa Electric Corporation
Product Type
Safety Control Unit
System Platform
ProSafe-RS Safety Instrumented System
Processor
MIPS R5000 Processor
Main Memory
32 MB
Memory Protection
Battery backup, up to 3 years at <= 30 degC
Origin
Japan
Network Interfaces
Dual-redundant V net interface, dual-redundant ESB bus interface
Expansion Capacity
Up to 9 Safety Node Units via SEC401 modules
I/O Module Capacity
Up to 8 I/O modules per unit
Total SCS I/O Capacity
Up to 78 I/O modules
Operating Temp
-20 degC to 50 degC (-S), -20 degC to 70 degC (-F)
Power Consumption
200 VA / 240 VA (100 to 120 VAC), 230 VA / 290 VA (220 to 240 VAC), 5.5 A / 7.0 A (24 VDC)
Weight
Approx. 7.9 kg (-S), Approx. 13.0 kg (-F)
Dimensions
Rack-mounted construction; exact dimensions not specified
Channel Isolation and DCS Communication Architecture
The SSC10S is designed for integration within Yokogawa ProSafe-RS and CENTUM system architectures through a common V net communication topology. Dual-redundant V net channels and dual-redundant ESB bus interfaces provide communication path redundancy between the Safety Control Station and associated system components.
The controller supports distributed safety I/O expansion through Safety Node Units connected via SEC401 modules. Communication redundancy is maintained across processor, network, and power subsystems to eliminate single-point hardware failures within the control station architecture.
Frequently Asked Questions
Q: Does the SSC10S support redundant network communication? A: Yes. The unit incorporates dual-redundant V net interfaces and dual-redundant ESB bus interfaces for communication redundancy within ProSafe-RS systems.
Q: How many Safety Node Units can be connected to one SSC10S? A: One SSC10S can connect up to 9 Safety Node Units through SEC401 modules installed in slots 7 and 8.
Q: Is time synchronization available for Sequence of Events Recorder functions? A: Yes. An optional IRIG-B000 GPS interface using an RS-422 connection can be implemented to provide time synchronization for SOER-capable digital input modules.
Field Installation Guidelines
Install the unit in a compatible equipment rack using the specified M5 mounting hardware.
Maintain clear airflow paths around the chassis. Fan-cooled (-F) versions require unobstructed ventilation openings.
Route communication wiring separately from high-voltage power conductors to minimize electromagnetic interference.
Follow shield grounding practices consistent with plant instrumentation standards and connect cable shields according to system grounding requirements.
Verify V net and ESB bus redundancy paths before system commissioning.
Confirm power supply voltage ratings match the suffix-specific hardware configuration prior to energization.
Replace memory backup batteries only in accordance with approved maintenance procedures to preserve stored configuration data.
Perform functional verification of redundant processor, network, and power channels following installation or maintenance activities.
