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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.

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