080G0034 by Danfoss

The 080G0034 programmable logic controller is produced by Danfoss as part of the MCX Programmable Controllers series. It serves as a central I/O concentrator that acquires field signals, executes user code, and drives actuators in refrigeration and HVAC assemblies, packaging lines, and other industrial automation cells. By combining mixed-signal inputs, pulse outputs, and power relays in one enclosure, the unit streamlines panel wiring and shortens response time between sensing and control.

The controller is powered from a resilient 24 V AC (±15%) supply, allowing operation on building-service transformers without an external converter. It samples process variables through 8 analog inputs that accept voltage or current transmitters, and it monitors contact closures with 8 digital inputs that draw only 5 mA per channel, minimizing sensor loading. Four proportional drive channels are provided as 4 analog voltage outputs. Each output maintains regulation down to a 1 k? load and is safeguarded by a 6.8 V open-circuit limit. Frequency-encoded commands for electronic expansion valves or variable-speed drives are delivered by 2 PWM/PPM outputs. Network integration is handled through an optically isolated RS485 interface, enabling Modbus or peer-to-peer links while protecting the logic core from bus transients. The module also contains eight form-C relay contacts for on-off solenoids and motor starters.

For inductive loads, the output stage includes 2 high-inrush relays rated 16 A each, and the remaining contacts share a 32 A total relay load limit to help prevent track overheating. Initial energization surges up to 80 A are tolerated for 20 ms on C1 and C2 channels, making the unit suitable for compressor or lamp circuits. Overall consumption stays within 17 VA on alternating current or 10 W on direct supply, easing power supply sizing. The molded bezel carries an IP40 front rating that blocks tool access and falling debris, while the rear remains open for cabinet ventilation.