Yokogawa SSC50D-S2121 Duplexed Safety Control Unit
Configured for fault-tolerant safety logic execution in ProSafe-RS systems, the Yokogawa SSC50D-S2121 (SSC50D Duplexed Safety Control Unit) provides direct physical/electrical execution. This rack-mountable unit houses redundant MIPS R5000 processors running parallel diagnostics to process discrete and analog safety loop signals across dual-redundant Vnet/IP networks and ESB bus interfaces.
Suffix Breakdown & Model Matrix
| Code | Specification |
|---|---|
| SSC50D | Duplexed Safety Control Unit Base Model |
| -S | Standard Type |
| 2 | Dual-redundant Power Supply Module |
| 1 | 100-120 VAC / 220-240 VAC or 24 VDC Power Supply |
| 2 | Dual-redundant Vnet/IP Interface |
| 1 | Standard Configuration |
| S1 | Style 1 |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SSC50D-S2121 S1 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 15 kg |
| Dimensions | 482.6 x 266 x 88.1 mm |
| Operating Temp | -10 to +55 deg C |
| Power Consumption | 230 VA (100-240 VAC) or 5.5 A (24 VDC) |
| Safety Certification | SIL3 compliant (IEC 61508 / IEC 61511) |
| Central Processing Unit | MIPS R5000 Processor |
| Main System Memory | 32 MB with non-volatile RAM (NVRAM) |
| Backplane Bus Interface | Dual-redundant ESB bus (supports up to 9 Safety Node Units) |
| Network Communications | Dual-redundant Vnet/IP (100 Mbps full duplex via RJ45) |
| Isolation Rating | 500 Vrms (input to ground) |
SIL3 Safety & Triple Modular Redundancy (TMR) / Pair & Spare Architecture
The safety control unit utilizes dual parallel CPUs operating in a pair-and-spare configuration to achieve SIL3 safety integrity. Internal hardware logic performs cross-checking of processor calculations at every clock cycle. Upon detecting a internal math mismatch or memory parity failure, the onboard diagnostic supervisor isolates the faulty channel while the redundant CPU maintains uninterrupted logic solver functions. Galvanic isolation up to 500 Vrms shields the internal system bus from field loop voltage surges and ground noise.
Frequently Asked Questions
Q: How does the duplex CPU configuration handle hardware fault isolation without triggering a false trip?
A: The redundant processors execute continuous hardware comparison diagnostics. If one processor fails a self-check or watchdog test, it automatically trips off-line, allowing the healthy processor to maintain safety loop control without interrupting plant operations.
Q: Can maintenance technicians replace power supply modules or I/O modules while the unit remains powered?
A: Yes, the unit supports full online hot-swapping for redundant power supply modules and attached I/O cards, provided the redundant partner module remains healthy during the replacement procedure.
Q: What action should operators take regarding memory retention power?
A: The onboard NVRAM utilizes a lithium battery (Part Number S9185FA) to retain operational data and error logs during full power outages; replace this battery every 3 years during scheduled shutdown windows.
Field Installation Guidelines
- Mount the control unit horizontally into a standard 19-inch instrument rack frame using four M5 retaining screws tightened to 2.5 Nm.
- Verify that ambient enclosure temperatures remain within -10 to +55 deg C and maintain 100 mm of clearance above and below the rack for proper natural convection.
- Connect both primary and secondary Vnet/IP industrial Ethernet cables using Cat5e shielded twisted-pair cables terminated with grounded RJ45 connectors.
- Connect dual independent 24 VDC or 100-240 VAC power feeds to the redundant input terminals to ensure total power path segregation.
- Bond the chassis ground lug directly to the main plant safety grounding bar using a low-impedance copper conductor with a minimum cross-sectional area of 5.5 mm2.
- Route ESB extension bus cables through dedicated cable trays, keeping signal lines separate from high-voltage motor control cables.
What's clients say about us
Excellent Emergency Support!
Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.
Mark Thompson
Maintenance Manager, USAReliable Source for New Spares
Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.
Robert Hoffmann
Engineering Lead, GermanyTop-tier Service and Quality
We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.
Lucas Müller
Operations Director, GermanyRelated Products
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