Description
The TOSHIBA UTLH21 is a specialized communication loop interface module designed for the Toshiba Integrated Controller V-series. It enables high-speed, deterministic data exchange between controllers and distributed I/O stations, ensuring synchronized control across large-scale industrial networks and complex automation architectures.
Technical Parameters
- Model: UTLH21
- Module Type: TOSLINE-S20 Loop Interface
- Transmission Speed: 20 Mbps high-speed serial
- Transmission Media: Shielded twisted pair or fiber optic (via adapter)
- Maximum Nodes: Up to 64 stations per loop
- Power Consumption: 5V DC / 600mA (Internal bus)
Product Specifications
- Network Topology: Ring or Bus configuration support
- Error Detection: CRC (Cyclic Redundancy Check) and parity hardware
- Diagnostics: Front-panel LED indicators (Run, Error, Transmit, Receive)
- Mounting: Standard V-series PLC backplane slot
- Isolation: Transformer-coupled signal isolation
- Distance: Up to 500m per segment (twisted pair)

Application Areas
- Distributed control for automotive assembly lines
- Steel and metal rolling mill synchronization
- Power plant auxiliary system networking
- Large-scale water treatment facility telemetry
- Chemical process plant distributed I/O management
Product Q&A
- Q: What is the primary function of the UTLH21?
- A: It acts as the master or slave interface for the TOSLINE-S20 network, allowing real-time data sharing between multiple Toshiba PLCs.
- Q: Does this module support fiber optic connections?
- A: While the base module uses twisted pair, it can be interfaced with optical converters for long-distance or high-noise environments.
- Q: Is configuration handled via hardware or software?
- A: Station addresses are typically set via onboard rotary switches, while network parameters are configured in the V-series engineering tool.


