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Yokogawa SSC50D-F2524 Duplex Safety Control Unit

Configured for deterministic safety logic execution in ProSafe-RS Safety Instrumented System (SIS), the Yokogawa SSC50D-F2524 (SSC50D base model) provides direct physical/electrical execution through a duplexed CPU architecture operating on synchronized parallel processing channels within Vnet/IP control networks.

Suffix Breakdown & Model Matrix

• F: Wide temperature specification with forced-air cooling and ISA G3 coating support
• 2: Dual-redundant power supply configuration
• 5: Non-explosion protected mechanical variant
• 2: 220–240 VAC supply class
• 4: Standard safety function licensing configuration (system-dependent activation)

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa SSC50D-F2524
Origin	Japan
Weight	approx. 13 kg
OperatingTemp	-20 degC to +70 degC
Architecture	Duplex dual-CPU synchronized execution
Communication	Vnet/IP 100 Mbps full duplex
Safety Integrity	IEC 61508 SIL3 capable (system dependent)
Node Capacity	Up to 9 safety node units via ESB bus
Power Input	220–240 VAC dual-redundant supply

Vnet/IP Deterministic Control and Channel Isolation Behavior

The SSC50D-F2524 implements Yokogawa process control integration via Vnet/IP cyclic scheduling, where safety task execution is time-sliced across redundant processors. Communication frames are transmitted over 100BASE-TX links with deterministic arbitration to maintain synchronization between duplex CPUs and remote safety nodes.

Channel-to-channel isolation is enforced at both processor and backplane levels, preventing cross-interference between redundant execution paths during safety logic evaluation cycles. Memory protection logic preserves last-valid state retention during brownout or full power loss events.

Frequently Asked Questions

Q: Can the SSC50D-F2524 operate in hot-swap CPU replacement mode?
A: CPU module replacement is not hot-swappable. System transition requires controlled shutdown or redundancy takeover prior to hardware exchange.

Q: What is the switching behavior during duplex failure conditions?
A: The standby processor assumes control through synchronized state mirroring with bumpless transfer, maintaining safety output continuity.

Q: Does Vnet/IP support mixed traffic with non-safety control data?
A: Yes, but safety and control domains remain logically segmented through network scheduling and protocol separation rules.

Field Installation Guidelines

• Install unit in a grounded 19-inch industrial rack with verified earth continuity below 0.1 ohm
• Maintain minimum clearance around fan assembly for forced-air cooling airflow path
• Use shielded CAT5e or higher Ethernet cabling for Vnet/IP connections
• Ensure ESB bus couplers are terminated according to Yokogawa backplane topology rules
• Apply proper cable segregation between safety I/O lines and power conductors to avoid EMI coupling
• Verify dual power feeds are independently sourced before energization

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