Gemo AR2-A-230VAC-8D – Compact Smart Relay / PLC with 8 Digital Inputs and 5 Relay Outputs

Gemo AR2-A-230VAC-8D is a compact smart relay / PLC designed for straightforward machine control, panel automation, sequencing, timing and counting applications. It operates directly from an AC mains supply and provides 8 digital inputs, 5 relay outputs and a dedicated PTC temperature-sensor input.

Gemo AR2 controllers have been available through our website since 2011.

Power supply and I/O

Power supply: 100–240 VAC, 50/60 Hz. Although the model designation includes 230VAC, the controller is designed for a wide AC input range.

Digital inputs: 8 low-voltage DC digital inputs are provided. The fact that the controller itself is AC-powered does not mean that 230 VAC can be applied to the digital-input terminals.

Auxiliary DC supply: The AC-powered AR2-A-8D provides an internal 18 VDC auxiliary supply for use with the digital-input circuitry.

Digital input filter: Standard input filtering is at least 8 ms for both ON-to-OFF and OFF-to-ON transitions.

Relay outputs: 5 digital relay outputs, rated up to 250 VAC / 2 A for resistive loads. Suitable suppression or interface devices should be considered when switching inductive loads such as contactor coils or solenoid valves.

Analog input: This model has no general-purpose analog input.

Analog output: Not available.

Real-time clock: This version does not include an RTC. Applications requiring weekly or annual calendar-based scheduling should use the Gemo AR2-A-230VAC-8D-RTC version.

PTC temperature input: One dedicated input is provided for a PTC temperature sensor, allowing temperature information to be included in the control program.

Ladder programming and internal functions

The AR2-A-8D is programmed with GEMO Ladder Editor. The ladder workspace provides 256 program lines, 5 contact columns and 1 output column. Rising-edge and falling-edge contact functions are available where required.

Programs are transferred through the controller's RS-232 programming interface.

Internal logic resources include 32 timers, 32 16-bit up/down counters, 32 offset counter comparators, high-speed counter functions and internal auxiliary relays.

Ladder scan time: Approximately 10 ms or less, depending on the application program.

High-speed counter inputs: Fast counter functions are available for pulse-counting applications. These inputs should not be confused with high-speed motion-control outputs.

Servo and step motor control

The relay-output AR2-A-230VAC-8D does not provide a high-speed pulse / direction output for positioning servo or step motor systems.

Applications requiring pulse-train positioning should use a PLC or motion controller designed specifically for motion control.

PID control

A built-in PID control algorithm is not provided. Applications requiring closed-loop temperature or process regulation should use a suitable process controller or a PLC with integrated PID functionality.

Display and operator functions

The controller features a 2 × 16 character backlit LCD display and three programmable front-panel function keys. Machine status, timer values, counter values and operator messages can be displayed directly on the controller.

Can an external HMI be connected? The AR2-A-8D series is not intended for the AR2-S-24VDC-MB1 Modbus gateway arrangement used with larger AR2 models. If an external operator panel or Modbus RTU connection is required, a suitable higher-level AR2 model or another PLC / HMI platform should be selected.

I/O expansion: This model is not expandable. AR2 I/O expansion modules used with larger versions of the series are not intended for the AR2-A-230VAC-8D. If the application requires more than 8 inputs or 5 outputs, an expandable AR2 model should be selected.

Operating environment

Operating temperature: 0 to 50 °C.

Protection rating: IP20 according to EN 60529.

Relative humidity: Up to 80% at 30 °C, decreasing as temperature rises to approximately 50% at 50 °C, non-condensing.

Installation altitude: Below approximately 2000 m above sea level.

Dimensions: Approximately 70 × 117 × 65 mm, including the terminal connector.

Terminal tightening torque: Maximum 0.5 N·m.

EMC and panel layout: When the controller is installed in the same enclosure as AC motor drives, frequency inverters, contactors or other sources of electrical noise, control wiring should be separated from power wiring wherever practical. Proper grounding and shielding practices should also be applied.

Because the controller is powered directly from the AC mains, correct isolation, overcurrent protection and physical separation between mains and low-voltage control wiring are particularly important.

Gemo AR2 programming software and documentation

Download GEMO Ladder Editor V2.4 programming software for AR2 programming and configuration.

For programming instructions, timer and counter functions and controller configuration, refer to the Gemo AR2 PLC English user manual.

For additional models and pricing, visit the Gemo price list, Gemo Electronic main page or our PLC product group.

For technical information and product selection, use our Gemo contact page or contact us at gemo@otomasyonavm.com.

Installation notice: Installation, wiring and commissioning of the Gemo AR2 should be carried out only by qualified technical personnel. Disconnect the AC supply before wiring or servicing the controller. Suitable external isolation and overcurrent protection should be provided, and mains and low-voltage control wiring should be installed in accordance with the manufacturer's instructions and applicable electrical-safety requirements.