Digital I/O module romod 4DIO-R eco

RS-485Modbus RTU4-O

Product information
The romod 4DI2DO-R-3P eco is a DIN-rail module providing two groups of 3-point relay outputs for controlling two OPEN-STOP-CLOSE drives (e.g. shutters) or similar actuators. Four digital inputs accept status or control signals for operation, error or position feedback.

Digital Outputs

• Relay outputs provide the normally open (NO) contact for each relay.
• Switched signals must share the same phase.
• For each channel, opening and closing run times can be parameterized as well as over-/understeer times (longer activation than required for full travel).
• Configured run times take effect only when outputs are activated via bus commands.

Digital Inputs

• Digital inputs are controlled with 24 V via external dry contacts; reference potential is defined via the COM terminals and may be 0 V or 24 V.
• With 24 V reference, inputs can be driven by 0 V signals.
• Four inputs can be configured as limit switches: on reaching an end position the drive is switched off and the module corrects the calculated position to 0% (closed) or 100% (open).
• If no end position is reached within configured run times in automatic mode, the drive switches off for safety; this does not apply in manually oversteered mode.
• Inputs can alternatively control outputs via externally connected steady switches (no pulses); configured run times are not considered in this mode.
• For AC-driven inputs, edge detection should be delayed via configuration registers—set to at least 40 ms at 50 Hz to avoid false detections.

Technical data

• Power supply: 24 V AC/DC, connection via terminals
• Current consumption: typically 68 mA (DC), 152 mA (AC) with all relays activated
• Power dissipation: max. 1.7 W (DC), 3.7 W (AC) with all relays activated
• DO specification: Relay outputs (NO), max. 250 VAC
• Initial contact resistance (resistive load): 100 mΩ (at 1 A / 24 VDC)
• Rated load: 3 A at 250 VAC / 30 VDC
• Max. switching voltage: 277 VAC, 30 VDC
• Max. switching capacity: 830 VA (AC), 90 W (DC)
• Endurance: 100,000 operations (rated load)
• Inductive loads should be avoided or suppressed at the source

Bus interface

• Interface: RS485
• Supported baud rates (autobauding): 9,600; 19,200; 38,400; 57,600 Baud
• Bus cycle time depends on baud rate and number of addressed data points
• Configuration stored in internal EEPROM, up to 100,000 write cycles
• Protocol: Modbus RTU (RS485), serial parameters 8-N-1

Environmental conditions

• Operating temperature: 0…50 °C
• Transport and storage temperature: 0…70 °C
• Relative humidity: 10…90% non-condensing
• Protection class: IP20