Présentation du produit
The Honeywell 621-9928 Serial Link Selector Module is a high-performance communication switching module designed for use in Honeywell’s 620/621 Distributed Control System (DCS) environments. This module enables the selection and routing sur serial communication links between controllers, operator stations, engineering workstations, or external systems. It is a critical component when building fault-tolerant and multi-channel communication topologies for process automation environments that demand high reliability and data integrity.
With the ability to switch between redundant or alternate communication paths, the 621-9928 ensures continuity in serial data transmission even in the event sur a link failure. It supports serial protocols such as RS-232 and RS-422 (depending on configuration), and is engineered for integration into legacy TPS systems or modern hybrid architectures.
Spécifications du produit
| Parameter | Details |
|---|---|
| Modèle | 621-9928 |
| Fabricant | Honeywell |
| Module Type | Serial Link Selector Module |
| Function | Switches serial communication paths |
| Supported Protocols | RS-232, RS-422 |
| Selectable Links | 2 input channels, 1 output (selectable) |
| Switching Logic | Manual, remote command, or automatic (configurable) |
| Baud Rate Range | 300 bps to 115.2 kbps |
| Status Indication | Front-panel LEDs (Link 1 Active, Link 2 Active, Fault) |
| Isolation | Optical isolation on all serial channels |
| Power Supply | 5 VDC (from system backplane) |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Mounting | DIN rail or card chassis |
| Compliance | CE, UL, CSA |
| Dimensions (H x W x D) | 130 x 35 x 110 mm |
| Poids | 0.75 kg |
Product Applications
The Honeywell 621-9928 is widely utilized in industries where uninterrupted serial communication is crucial for plant safety, control, and real-time monitoring. Key application areas include:
-
Redundant Operator Interfaces – Automatically switches to a backup serial path if the primary fails.
-
PLC-to-DCS Communication – Routes multiple PLCs through different serial channels for distributed data access.
-
Third-party Integration – Selects between serial interfaces for non-Honeywell SCADA or MES systems.
-
Remote Monitoring Systems – Provides backup communication paths for remote telemetry unités (RTUs).
-
Industrial Batch Control – Ensures communication continuity with serially connected field controllers.
-
Process Plant Gateways – Interfaces DCS with external historians, analyzers, or SCADA via serial ports.
Product Advantages
-
Automatic or Manual Switching: Offers flexibility with configurable control logic to suit different system designs.
-
Redundant Serial Communication: Enables communication failover to maintain continuous system operation.
-
Flexible Protocol Support: Compatible with both RS-232 and RS-422 serial standards.
-
Integrated Status LEDs: Provides immediate visual diagnostics sur active paths and failure conditions.
-
System Compatibility: Seamlessly integrates with Honeywell 620/621 series systems and legacy architectures.
-
Electrical Isolation: Minimizes the risk sur ground loop interference or voltage spikes on serial lines.
-
Long-Term Reliability: Built to industrial standards for continuous 24/7 operation in harsh environments.
FAQ
-
What types sur serial communication does the 621-9928 support?
The module supports both RS-232 and RS-422 protocols, depending on configuration. -
Can the link switching be controlled programmatically from the host system?
Yes, switching can be controlled via remote command from a supervisory controller or configured to switch automatically. -
Does the module support bidirectional serial data flow?
Yes, it handles full-duplex communication for both RS-232 and RS-422 interfaces. -
How many communication paths can it manage simultaneously?
The module supports 2 selectable input serial paths with 1 output path to the destination device. -
Is link switching instantaneous?
Switching is near-instantaneous (< 10 ms), minimizing communication disruption. -
Does it provide any feedback or status to the controller?
Yes, it has front-panel LEDs and can send fault or switch status back to the host system. -
Is galvanic isolation implemented between channels?
Yes, the serial lines are optically isolated to prevent electrical faults from propagating. -
Can this module be used with non-Honeywell systems?
Yes, it can switch between serial sources regardless sur the manufacturer, as long as electrical standards are respected. -
Is the baud rate configurable or fixed?
It supports a wide range sur baud rates from 300 bps to 115.2 kbps; compatible with standard serial configurations. -
Can multiple 621-9928 modules be used in the same rack?
Yes, multiple modules can be installed for multi-channel serial switching scenarios.
Related Modèles (Same Series or Function)
| Modèle | Description | Function | Protocol/Type |
|---|---|---|---|
| 621-9000 | Slave I/O Extender Module | I/O communication extender | RS-485 (I/O LAN) |
| 621-9001 | Slave Power Supply Extender | Power extender for I/O modules | 5 VDC |
| 621-9930 | I/O Bus Interface Module | Primary I/O link driver | RS-485 |
| 621-1100 | Analog Input Module | AI signal processing | 4–20 mA, RTD |
| 621-2210 | Digital Output Module | DO signal processing | 24 VDC output |
| 621-2100 | Relay Output Module | Discrete high-power output | SPDT relays |
Popular Honeywell Modèles
| Modèle | Description | Type | Application |
|---|---|---|---|
| C300 Controller | Distributed Control System CPU | Controller | Process Automation |
| HC900 Controller | Hybrid controller for process and logic | Hybrid Control | Batch, thermal, logic systems |
| UDC3500 | Universal Digital Controller | Loop PID Controller | Process & Temperature Control |
| STT750 | Smart Temperature Transmitter | Field Transmitter | Temperature Monitoring |
| SMV3000 | Smart Multivariable Flow Transmitter | Pressure/Flow Transmitter | Process Measurement |
| FSC (TMR) | Triple Modular Redundancy Safety System | SIL3 Safety Controller | Emergency Shutdown Systems |
Informations sur l'entreprise
E-mail: [email protected]
Mobile：Contactez-nous par email
Whatsapp：Contactez-nous par email
Add: Alishan Building, 2 Lvling Rd, District Siming, Xiamen, Fujian, Chine, 361006
Nos services
Nous sommes spécialisés dans la fourniture de pièces d'automatisation industrielle avec une garantie d'un an. Nos pièces d'automatisation industrielle sont vendues dans le monde entier.
Nous pouvons fournir des équipements et des pièces détachées de différents pays et fabricants, résoudre vos inquiétudes ou problèmes de qualité en de nombreux endroits, et surfrir un excellent avantage de prix.
N'hésitez pas à nous appeler pour plus de détails sur les produits.
