ALR121-S53 S1 Yokogawa Serial Communication Module

Yokogawa ALR121-S53 S1 CENTUM VP RS-422/RS-485 Module

Yokogawa ALR121-S53 S1 CENTUM VP RS-422/RS-485 Module

Availability: 20 left in stock

Yokogawa ALR121-S53 S1 RS-422/RS-485 Communication Module The Yokogawa ALR121-S53 S1, also cataloged as the ALR121 Serial Communication Module, operates as...

SKU: ALR121-S53 S1

Manufacturer: Yokogawa
Product No.: ALR121-S53 S1
Product Type: Serial Communication Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 300g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa ALR121-S53 S1 RS-422/RS-485 Communication Module

The Yokogawa ALR121-S53 S1, also cataloged as the ALR121 Serial Communication Module, operates as a dedicated hardware component for serial subsystem data exchange within CENTUM VP and ProSafe-RS control networks.

Suffix Breakdown & Model Matrix

Model / Suffix Code	Specification
ALR121	Serial Communication Module (2-channel, RS-422/RS-485)
-S5	Standard type with basic functions
3	With diagnostic functions
S1	Hardware style code revision 1

Hardware Specifications

Parameter	Specification
Model	ALR121-S53 S1
Brand	Yokogawa
Origin	Japan
Weight	0.30 kg
Dimensions	30 mm (W) x 100 mm (H) x 80 mm (D)
Operating Temp	-40 to +75 deg C
Power Consumption	0.5 A at 5 VDC (backplane bus power)
Input Voltage	24 VDC
Interface Ports	2 ports (RS-422 point-to-point / RS-485 multipoint)
Transmission Speed	1200 to 38400 bps
Max Cable Length	1200 m (RS-485) / 15 m (RS-422)
Transmission Code	ASCII / Binary
Frame Synchronization	Start-stop asynchronous
Isolation Barrier	Photocoupler isolation between field and backplane
Module Mounting	AFV30, AFV40, ANB10, ANB11 base units

Channel-to-Channel Isolation & Signal Integrity

The Yokogawa ALR121-S53 S1 incorporates photocoupler electrical isolation to decouple external field serial loops from backplane logic communication paths. Supporting Modbus slave protocols alongside customized subsystem driver configurations, the module executes half-duplex asynchronous data transfer across both independent ports. Hardware transmission buffers and dedicated signal processing circuits absorb transient common-mode voltage shifts, preventing field-side noise from interfering with controller backplane data cycles over long 1200 m RS-485 lines.

Frequently Asked Questions

Q: How are communication parameters like baud rate and parity configured on the ALR121-S53 S1?

A: Engineers configure transmission rates (up to 38400 bps), parity (None/Even/Odd), and stop bit parameters directly in the CENTUM VP software system builder, which downloads parameters to the module during initialization.

Q: Can Port 1 and Port 2 operate with different physical interfaces simultaneously?

A: Yes, each port supports independent configuration, allowing one port to run RS-422 point-to-point connections while the second port runs an RS-485 multipoint network.

Q: What cables connect field devices to the module front interface?

A: Standard Yokogawa shielded communication cables (such as the AKB131, AKB132, AKB133, and AKB134 cable assemblies) interface directly with the module's terminal blocks or connectors.

Field Installation Guidelines

Technicians should follow standard cabinet assembly procedures during field integration:

Insert the module into a compatible slot on an ANB10 or ANB11 node unit after verifying backplane power keying.
Terminate the RS-485 network ends using appropriate line termination resistors to eliminate signal reflection over extended cable runs.
Route serial cables inside dedicated low-voltage instrument raceways, maintaining separation from high-voltage AC conductors and drive lines.
Attach cable shields to the cabinet ground bar using dedicated grounding clamps to preserve noise immunity across the transmission loop.

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, USA

Reliable 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, Germany

Top-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.