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Extend Your ESB Bus Network with High-Performance Optical Transmission

The SNT401-13 from Yokogawa serves as an Optical ESB Bus Repeater Master Module. It converts standard ESB Bus signals into optical signals, enabling long-distance network transmission. Pair the SNT401 Master Module with a SNT501 Slave Module using fiber-optic cables to extend your ESB Bus network. Single-stage configurations reach up to 5 km, while dual-stage setups in compatible Vnet/IP systems achieve up to 10 km.

Key Technical Specifications

• Function: Optical signal transport for ESB Bus networks
• Connection Types: Supports both Star and Chain configurations
• Maximum Connection Stages: Two stages for extended distances
• Transmission Distance:
  • Single Stage: Up to 5 km
  • Two Stages (Vnet/IP R1.03+): Up to 10 km
• Current Consumption: 0.5 A
• Weight: Approximately 0.3 kg
• Nominal Tolerances: ±0.8 mm for dimensions ≤120 mm; combination ±1.5 mm; follow JEM 1459 for larger dimensions
• Operating Temperature: -20°C to 70°C (maintenance purposes)
• Compliance: ISA Standard G3
• Explosion Protection: Available with suffix -1 (none) or -3 (G3 compliant)

Mounting Guidelines and System Integration

Install duplex modules on two adjacent slots, keeping odd-numbered slots for ESB Bus 1 and even-numbered slots for ESB Bus 2. Leave two empty slots near the power supply for high-temperature operation (60–70°C). Use the SNT10D Rack for mounting Yokogawa Optical ESB Bus Repeater Modules. Follow manuals GS 32Q06K11-31E and GS 32P06K60-01EN for compatibility with modules such as S2SC70, SSC60, SSC50, and SNB10D.

Model Variants and Pairing Rules

• Suffix Codes:
  • -1: No explosion protection
  • -3: ISA G3 compliant, -20°C to 70°C
• Pairing Rules:
  • SNT401-3 pairs with SNT501-3
  • SNT401-F pairs with SNT501-F or S2EN501-1
• Ensure identical suffix codes for Bus 1 and Bus 2 modules. Connect S2EN501 only in S2NN30D units.

System Requirements

• SENG: Version R1.02 or later
• SCS: Version R1.02 or later

Why Choose the SNT401-13

Engineers select the SNT401-13 for its precise optical transmission, low weight of 0.3 kg, and flexible network topology support. Its robust temperature tolerance and compliance with ISA G3 standards ensure reliable performance in industrial safety networks.

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