Product Overview
Murrelektronik CUBE20S DI8 Module - 8-Channel 24VDC Digital Input, IP20, Spring Clamp Terminals, DIN Rail
Condition
Unused NOS - new old stock, unopened in original box. Label confirms part number 57280, firmware 6A1S0-1.20-0.01, revision A100, serial 00223631, UL Listed, Made in Thailand. Sourced from a contract manufacturer clearing surplus stock.
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Product Overview
Murrelektronik 57280 is a CUBE20S series digital input module (DI8) that reads eight 24VDC on/off signals from sensors, switches, or other discrete devices and delivers that data to a central controller via the CUBE20S backplane. It connects via spring clamp terminals, mounts on DIN rail, and integrates directly into the CUBE20S distributed I/O system - reducing wiring complexity and cabinet footprint compared to standalone input cards. The module draws a maximum of 60mA from the system connection and carries an IP20 rating for in-cabinet installation.
Key Features
- 8 digital inputs, 24VDC
- Spring clamp terminals - tool-free, vibration-resistant wiring connections
- DIN rail mounting
- Current consumption: 60mA max (via CUBE20S system connection)
- Input current carrying capacity: 0.5A max
- Operating temperature: 0-60°C
- Protection rating: IP20 - designed for in-cabinet installation
- CUBE20S backplane communication and power via integrated ribbon connection
- Short circuit and overload diagnosis supported
- UL Listed - confirmed on unit label
Applications
- Automation engineer wiring proximity sensors, limit switches, or pushbuttons into a CUBE20S I/O rack mounted in a control cabinet, then mapping those eight inputs to a PLC for machine sequencing logic
- Control cabinet integrator adding discrete input capacity to an existing CUBE20S system build - snap to DIN rail, spring-clamp the field wiring, and the channel count is live
- Maintenance technician replacing a failed input module in a running CUBE20S system without disturbing adjacent modules or rewiring the backplane
- Hobbyist or lab builder working with a CUBE20S development setup who needs clean 24VDC digital acquisition from multiple sensors on a single compact module
Frequently Asked Questions
Is this module compatible with any I/O system other than CUBE20S?
No. The 57280 is an expansion module designed exclusively for the Murrelektronik CUBE20S system. It relies on the CUBE20S backplane for communication and power distribution and will not function as a standalone device or in any other I/O platform.
What type of sensors can I connect to this module?
The module accepts 24VDC digital (discrete) signals - sensors, switches, or any field device with a 24VDC output. PNP sensor compatibility is the expected configuration for this input type; confirm your sensor output polarity matches your CUBE20S system setup before wiring.
Is a gateway or base module required to use this?
Yes. The 57280 is an expansion module and requires a CUBE20S gateway or head station to communicate with a PLC or fieldbus network. It cannot operate independently.
What is included with this module?
The module itself, as shown. No additional accessories or documentation included.
Can this be used outside a control cabinet?
The IP20 rating means the module is protected against solid objects larger than 12mm but offers no protection against water or dust ingress. It is designed for in-cabinet use. Exposure to wet or dusty environments requires a suitably rated enclosure.
Eight inputs, one clean module, zero rewiring of the backplane - when the CUBE20S system needs another bank of signals, this is the part that closes the gap.
