Configured for long-distance data transmission in distributed control system platforms, the Yokogawa ANT401-50/CU1T (ANT401-50 Optical ESB Bus Repeater Master Module) provides direct physical and electrical execution of ESB bus signal conversion.

Suffix Breakdown & Model Matrix

Hardware Specifications

Optical Signal Propagation and Bus Integrity

The ANT401-50/CU1T functions as the master repeater node, transforming electrical bus traffic into modulated light pulses to span distances up to 50 km. This optical conversion provides intrinsic galvanic isolation, protecting the control network from common-mode electrical noise and ground potential differences often found in geographically dispersed industrial sites. The module supports both single and dual-redundant configurations, allowing for seamless integration into high-availability communication loops. The included /CU1T connector unit provides necessary active bus termination to prevent signal reflection at the terminal end of the ESB bus segment.

Frequently Asked Questions

Q: Can this module be configured for non-redundant installations?

A: Yes. The ANT401-50/CU1T is compatible with both single-bus and dual-redundant bus topologies. In non-redundant setups, only the primary port is utilized for signal transmission.

Q: How is bus termination handled with the /CU1T option?

A: The /CU1T option integrates the required terminator directly within the connector unit. When installing, ensure that the terminator is placed only at the physical end of the ESB bus segment to maintain correct bus impedance and prevent communication errors.

Field Installation Guidelines

• Verify the optical fiber type is compatible with the module's light source wavelength before installation; utilizing mismatched fiber diameters will result in severe signal attenuation.
• Before seating the module, inspect the ESB bus backplane connector for debris or bent pins, as this can interrupt the low-voltage communication signals.
• When configuring for redundant operation, ensure that both the primary and secondary ANT401-50 modules are installed and recognized by the controller firmware to enable synchronized failover capabilities.
• Route the fiber-optic cabling through protected conduits or trays to prevent physical damage or micro-bending, which would degrade the optical signal strength over the 50 km distance.
• Post-installation, use a light power meter to measure the received optical power at the far-end receiver to verify it falls within the module's specified dynamic range.