Excellent PLC
| Company Information | ||||||||
| [email protected] | ||||||||
| Mobile | +8613666033393 | |||||||
| +8613666033393 | ||||||||
| 13666033393 | ||||||||
| Add | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
Product Introduction
The Yokogawa SNT401 Optical ESB Bus Repeater Master Module is designed to extend ESB bus communication in safety control systems by converting electrical signals to optical signals. It enables long-distance communication (up to 5 km, or 10 km in specific configurations) between safety control units, safety node units, and N-IO nodes. The SNT401 works as the master module in a repeater pair and is typically paired with an SNT501 slave module or S2EN501.
Technical Specifications
| Parameter | Specification |
|---|---|
| Function | ESB Bus optical transport |
| Connection Method | Star or chain type |
| Number of Stages | Maximum 2 |
| Maximum Transmission | 5 km (up to 10 km in R1.03+) |
| Current Consumption | 0.5 A |
| Dimensions (W x H x D) | 142.5 × 130 × 32.8 mm |
| Weight | Approx. 0.3 kg |
| Operating Temperature | –20°C to 70°C (optional) |
| Compatible Units | SEC401, SEC402, SSB401, SNB10D |
Applications
The SNT401 is used in industrial safety and automation environments where long-distance, reliable ESB bus communication is required:
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Extending ESB bus connections between distributed control and safety systems
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Optical signal conversion for improved noise immunity
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Redundant and duplex configurations in critical safety systems
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Centralized or distributed installations in chain or star topologies
Advantages
The SNT401 provides several benefits:
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Enables long-distance (up to 10 km) ESB communication
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Supports both star and chain topologies for flexible system design
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Compact and lightweight design, easy to integrate into existing racks
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Enhanced noise immunity through optical signal transmission
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Supports redundant configurations for high system availability
FAQ
Q1: What is the maximum communication distance of the SNT401?
A1: The SNT401 supports up to 5 km in standard configurations, and up to 10 km in R1.03+ systems with two stages.
Q2: Can the SNT401 be used alone?
A2: No, it must be paired with an SNT501 or S2EN501 at the slave side.
Q3: What are the supported connection types?
A3: Both star and chain topologies are supported.
Q4: Does the SNT401 support redundant configurations?
A4: Yes, it supports duplex configurations for redundancy.
Q5: Is the SNT401 compatible with SNT10D racks?
A5: Yes, it can be installed in SNT10D units specifically designed for optical repeater modules.
Q6: What is the power consumption of the SNT401?
A6: The SNT401 consumes approximately 0.5 A.
Q7: Does the SNT401 include a terminator?
A7: Both options are available: with (/CU1T) or without (/CU1N) terminator.
Q8: What is the weight of the SNT401?
A8: The module weighs approximately 0.3 kg.
Q9: What environmental conditions can the SNT401 operate in?
A9: Optional versions support –20°C to +70°C and ISA G3 standard.
Q10: Can the SNT401 connect directly to the safety node unit?
A10: Yes, through the ESB bus interface module (SSB401) on SNB10D.
Recommended Related Models (Same/Similar Series)
| Model | Description | Dimensions (mm) | Weight |
|---|---|---|---|
| SNT501 | Optical ESB Bus Repeater Slave Module | 142.5 × 130 × 32.8 | 0.3 kg |
| S2EN501 | N-ESB Bus Module | 142.5 × 130 × 32.8 | 0.3 kg |
| SEC401 | ESB Bus Coupler Module | 142.5 × 130 × 32.8 | 0.3 kg |
| SEC402 | ESB Bus Coupler Module (alternative) | 142.5 × 130 × 32.8 | 0.3 kg |
| SSB401 | ESB Bus Interface Module | 142.5 × 130 × 32.8 | 0.3 kg |
| SNB10D | Safety Node Unit | 142.5 × 130 × 32.8 | 0.3 kg |
Recommended Popular Yokogawa Models
| Model | Description | Dimensions (mm) | Weight |
|---|---|---|---|
| PW402 | Power Supply Module | 142.5 × 130 × 32.8 | 0.3 kg |
| CP451 | Processor Module | 142.5 × 130 × 32.8 | 0.3 kg |
| ALR121 | Alarm Module | 142.5 × 130 × 32.8 | 0.3 kg |
| FCN-RTU | Field Control Node RTU | 142.5 × 130 × 32.8 | 0.3 kg |
| PW102 | Power Supply Module | 142.5 × 130 × 32.8 | 0.3 kg |
| AAI143-H50 | Analog Input Module | 142.5 × 130 × 32.8 | 0.3 kg |
