Yokogawa SSC60D-S2521 ProSafe-RS Duplexed Safety Control Unit

Description

Yokogawa ProSafe-RS Safety Control Stations utilize dedicated central processing units to execute safety instrumented functions across process automation systems. The Yokogawa SSC60D-S2521 is a rack-mountable duplexed safety control unit designed for operation on Vnet/IP control networks. Functioning as a high-reliability CPU node within the ProSafe-RS Safety Instrumented System (SIS), the unit manages safety logic execution and continuous diagnostics to meet Safety Integrity Level (SIL) 3 requirements.

The SSC60D-S duplexed control architecture incorporates redundant hardware channels to maintain continuous control execution and plant protection during component maintenance or single-fault events. It features dual-redundant Vnet/IP network interfaces (BUS1 and BUS2) and interfaces with safety node I/O units through redundant ESB bus links using SEC402 coupler modules. The controller integrates with FAST/TOOLS SCADA systems, CENTUM DCS, and Plant Resource Manager (PRM), while supporting Modbus master/slave protocols over serial and Ethernet communication modules.

Features

• Certified by TÜV for SIL 3 safety application compliance in accordance with IEC 61508.
• Dual-redundant CPU module architecture for fault-tolerant safety control operation.
• Dual-redundant Vnet/IP control network interfaces with automatic path switchover.
• Connects up to 13 I/O safety node units via ESB bus using SEC402 bus coupler modules.
• Integrated Sequence-of-Events Recorder (SOER) functionality for process diagnostic logging.
• Supports Inter-SCS safety communication for distributed SIL 3 safety loops across stations.
• Modbus master and slave subsystem communication capability via serial and Ethernet interface modules.
• Standard operating temperature range designed for cabinet-mounted rack installations.

Applications

• Emergency Shutdown Systems (ESD)
• Burner Management Systems (BMS)
• Fire and Gas Detection and Protection Systems (F&G)
• High Integrity Pressure Protection Systems (HIPPS)
• Critical Process Safety Loops in Oil, Gas, Petrochemical, and Power Facilities

Technical Specifications

Installation Guidelines

• Cabinet Mounting: Mount the rack-type safety control unit inside a lockable metal cabinet to satisfy standard safety and EMC protection requirements.
• Grounding Requirements: Provide independent grounding with a grounding resistance of 100 ohms or less.
• Network Cabling: Connect Vnet/IP network buses BUS1 and BUS2 through independent Layer 2 switches. Ensure both switches are not powered down simultaneously during operation.
• ESB Bus Connections: Maintain dedicated ESB bus cable (YCB301) lengths within 10 m each for upper and lower ports on the SEC402 coupler module.
• Power Line Protection: Install dedicated circuit breakers on the power distribution board conforming to UL 489 / CSA C22.2 No. 5 or EN 60947-1 / EN 60947-3.

Compliance and Certifications

• Functional Safety: Certified SIL 3 in accordance with IEC 61508 by TÜV.
• PLC Standard: Compliant with IEC 61131-2.
• Application Standards: Compliant with EN 54, EN 298, EN 50156-1, IEC 61511-1, IEC 62061, NFPA 85, NFPA 72.
• Electrical Safety: Compliant with CAN/CSA-C22.2 No.61010-1 (100-120 V AC), CE Marking Low Voltage Directive (EN 61010-1, EN 61010-2-030).
• EMC Conformity: CE Marking EMC Directive (EN 55011 Class A Group 1, EN 61000-6-2, EN 61000-3-2, EN 61000-3-3), C-Tick Marking (EN 55011 Class A Group 1), KC Marking.
• Hazardous Locations: FM Non-Incendive (Class I Division 2 Groups A, B, C, D T4), Type "n" Ex protection (II 3 G Ex nA IIC T4 Gc / II 3 G Ex nA nC IIC T4 Gc).