Remote indication interface
Type RIS-FS2

The remote indication interface type RIS-FS2 provides a bidirectional interface between a remote terminal unit (RTU) and the overhead line fault indicators type FLA4. The RIS-FS2 is designed to receive fault information, status information and configuration settings from the FLA4 fault indicators and to provide this data through a serial RS485 interface using the Modbus protocol. The RIS-FS2 acts as Modus server device.
By writing into the Modbus registers the RIS-FS2 is also able to change the configuration of the overhead line indicators, thus providing a fully bidirectional interface.

The RIS-FS2 collects following data from the overhead line indicators:
• Faults
• Network events (current on/off, voltage on/off)
• Load current read-outs
• Voltage status information
• Temperature read-outs
• Configuration settings

This data is gathered using short-range radio communication with the FLA4 fault indicators. The bidirectional radio communication allows for the adjustment of the fault indicator settings through the RIS-FS2 interface.
The RIS-FS2 is housed in a DIN rail enclosure, featuring two buttons, an external antenna connector, and screw connectors for easy integration into remote terminal unit setups. Additionally, the RIS-FS2 is available as a circuit board for direct integration into custom housings.
The firmware of the RIS-FS2 is updatable with the help of the integrated SD card reader.

Operation

In the event of a fault, the overhead line indicators type FLA4 transmit event data to the nearby RIS-FS2 remote indication interface via their integrated short-range radio module, as illustrated in below figure. Upon receiving the data, the RIS-FS2 signals the event through the relay and by changing the states of Modbus registers.
All overhead line indicators type FLA4 are equipped with short-range radio modules, enabling retrofit installations of pole-mounted RTU setups with integrated RIS-FS2 interfaces.

The RIS-FS2 features a datalogging mode, which allows the overhead line indicators to transmit current read-outs and voltage status updates at short intervals while optimizing the power consumption of the indicators.
Fault and network events are accessible via Modbus registers and can also be signalled through a configurable relay contact. This feature enables a very low power consumption mode, where the RIS-FS2 and the Modbus master device can operate in standby mode and only become active upon the occurrence of events.

Features and Benefits

Bidirectional communication:
Read and change settings of the overhead line indicators.

Low power mode suitable for battery powered RTU setups

Datalogging mode for frequent current load read-outs

Updatable firmware

Test and reset buttons

Modbus configuration via DIP switches

All input and output cables are connected via screw connectors

Standard-sized housing mountable on TH35 DIN rails without tools

Power supply: 6V DC to 48V DC