YOKOGAWA ALR121-S01 Alarm Module | Replacement, Equivalent & Selection Guide
The YOKOGAWA ALR121-S01 is an S1-series alarm output module designed for use within YOKOGAWA’s CENTUM VP and CS 3000 Distributed Control Systems (DCS). It provides reliable alarm signal processing and output for process automation environments in oil & gas, petrochemical, power generation, and other critical industries. This page serves as a comprehensive selection, replacement, and compatibility reference for engineers and procurement teams.
Technical Specifications
- Part Number: ALR121-S01
- Series: S1 (CENTUM VP / CS 3000 I/O)
- Module Type: Alarm Output Module
- Manufacturer: YOKOGAWA Electric Corporation
- Output Type: Relay contact alarm output
- Mounting: DIN rail / backplane slot mount
- Operating Temperature: 0°C to 55°C
- Power Supply: Supplied via system backplane
- Weight: Approx. 300 g
- Compliance: CE, UL (per YOKOGAWA system certification)
- Country of Origin: Japan
Compatible Replacement & Equivalent Models
When the ALR121-S01 is discontinued, out of stock, or requires a cost-effective alternative, the following models may serve as functional equivalents or drop-in replacements (subject to system configuration verification):
- YOKOGAWA ALR111-S01 – Earlier-generation alarm module; compatible in most CS 3000 configurations with firmware check
- YOKOGAWA ALR121-S02 – Variant with extended output channel count; backward-compatible in most CENTUM VP racks
- YOKOGAWA ADV151-P00 – Digital output module usable as alarm relay substitute in certain I/O configurations
- Third-party equivalents – Modules from Emerson DeltaV or Honeywell Experion may serve as functional replacements in hybrid migration projects; consult your system integrator
⚠ Always verify firmware version, rack slot compatibility, and I/O builder configuration before substituting modules in a live DCS environment.
Why Choose the Original ALR121-S01
- ✅ Guaranteed OEM compatibility – Plug-and-play with CENTUM VP and CS 3000 without reconfiguration
- ✅ Factory-tested reliability – Meets YOKOGAWA’s stringent QA standards for process-critical alarm systems
- ✅ Long service life – Designed for 24/7 continuous operation in industrial environments
- ✅ Full technical support – Backed by YOKOGAWA documentation, firmware updates, and global service network
- ✅ Regulatory compliance – Certified for use in safety-instrumented and hazardous-area adjacent systems
Typical Applications
- Oil & gas refinery process alarm management
- Petrochemical plant DCS alarm annunciation
- Power generation turbine and boiler alarm output
- Pharmaceutical batch process alarm monitoring
- Water treatment and utilities SCADA integration
- Pulp & paper mill process control alarm systems
System Compatibility
- YOKOGAWA CENTUM VP (R4.xx, R5.xx, R6.xx) – Full compatibility
- YOKOGAWA CS 3000 (R3.xx) – Compatible with S1-series I/O nest
- YOKOGAWA CENTUM CS – Legacy support; verify with YOKOGAWA engineering
- Field Control Station (FCS): AFV10D, AFV30D, KFCS, LFCS2 – Confirmed compatible nest types
Selection Guide
Use the following criteria to confirm the ALR121-S01 is the correct module for your application:
- Step 1 – Confirm DCS platform: Verify your system is CENTUM VP or CS 3000 with S1-series I/O nests
- Step 2 – Check slot assignment: Confirm the target slot is designated for alarm output in your I/O builder configuration
- Step 3 – Verify output requirements: Confirm relay contact output type matches your field device wiring
- Step 4 – Check firmware: Ensure FCS firmware version supports ALR121-S01 (consult YOKOGAWA IM 33S01B30-01EN)
- Step 5 – Quantity & redundancy: Determine if redundant module configuration is required for your SIL level
Not sure which module fits your system? Contact our technical team with your FCS model and I/O nest drawing for a free selection consultation.
Quality Assurance & Sourcing
- All modules are sourced from authorized distributors or verified surplus channels
- Each unit undergoes visual inspection and functional verification before shipment
- Original packaging, labels, and documentation preserved where available
- Traceability records maintained for every unit (batch/lot number on request)
- 30-day return policy for unused, unopened modules
How to Order
- SKU: ALR121-S01
- Lead Time: In-stock units ship within 1–3 business days; sourced units 7–21 days
- MOQ: 1 unit
- Payment: T/T, PayPal, credit card, and trade assurance accepted
- Shipping: DHL / FedEx / UPS worldwide; sea freight available for bulk orders
- Custom Quote: [email protected] | +0086 19859288691
Replacement & Compatibility FAQ
Q: Can I use ALR121-S01 in a CENTUM VP R6 system?
A: Yes. The ALR121-S01 is fully compatible with CENTUM VP R4 through R6 when installed in an S1-series I/O nest.
Q: Is ALR121-S01 interchangeable with ALR111-S01?
A: They share the same form factor and backplane interface. However, channel count and firmware behavior may differ. Always validate in your I/O builder before hot-swapping.
Q: Do you supply new or refurbished units?
A: We supply both new OEM units and professionally inspected surplus units. Condition is clearly stated on each listing. Contact us if you require new-in-box only.
Q: Can you source discontinued YOKOGAWA modules?
A: Yes. We specialize in legacy and hard-to-find DCS components. Submit your part number and required quantity for a sourcing quote.
Q: What warranty is provided?
A: All units carry a 90-day functional warranty. Extended warranty options available for volume orders.
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Contact: [email protected] | +0086 19859288691
