Panel-mount HMI RBT50

LEDModbusoperator interface

Product information
The RBT50 operator module is a 19" panel-mounted analog/digital interface for manual control and override of two analog setpoints and two digital outputs via Modbus. It provides local adjustment using two rotary encoders with integrated push-buttons, each paired with a 10-segment LED bargraph and a single status LED, plus two switches for digital outputs. Values set locally are communicated to the DDC or connected fieldbus devices over Modbus and can be used to drive analog and digital datapoints in the automation system.

Functions / features

• 2 analog setpoints adjustable via rotary encoders with integrated push-buttons
• 2 digital outputs controllable via local switches
• Per encoder: 10-segment LED bargraph plus single status LED for visualization
• Dimming of the last bar segment to display intermediate values
• Global bargraph brightness adjustable via a configuration register
• Lamp test available by Modbus command or local lamp-test push-button
• Communication and value query via Modbus bus
• Register-based readout for switches, push-buttons and analog value changes (reading clears bits)

Technical specifications

• Manufacturer: romutec Steuer- und Regelsysteme GmbH
• Model: RBT50
• Product number (SKU): 00003004
• Weight: 0.09 kg
• Interface: Modbus (bus connection)
• I/O: 2 analog setpoints (encoders), 2 digital outputs (switches)
• Display: 10-segment LED bargraphs with dimming of last segment; single status LEDs
• Controls: 2 rotary encoders with integrated push-buttons, 2 switches, lamp-test push-button
• Functions: brightness configuration, lamp test, register-based status polling
• Register behavior: bits are reset to zero after readout
• Note: See configuration documentation for addressing, maximum modules per Modbus master, mounting and bus wiring