Gemo AR2-A-230VAC-14D – Expandable Smart Relay / PLC with 14 Digital Inputs and 10 Relay Outputs

Gemo AR2-A-230VAC-14D is an expandable smart relay / PLC designed for machine automation, control panels, sequencing, timing and general-purpose logic applications. It operates directly from an AC mains supply and provides 14 digital inputs, 10 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 mains input range. Maximum power consumption is approximately 6 W.

Digital inputs: 14 low-voltage DC digital inputs are provided. The inputs are interpreted as approximately OFF at 0–2 VDC and ON at 10–32 VDC. Standard digital input filtering is at least 8 ms for ON-to-OFF and OFF-to-ON transitions.

Auxiliary DC supply: The AC-powered version provides an internal 18 VDC / 50 mA auxiliary supply for use with the digital-input circuitry. The controller's AC mains supply must not be confused with the voltage level required at its digital inputs.

Relay outputs: 10 digital relay outputs, rated up to 250 VAC / 2 A for resistive loads. Suitable suppression or interface components should be considered when switching inductive loads such as contactor coils, solenoid valves or similar devices.

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

Analog output: Not available.

PTC temperature input: One dedicated input is provided for a 2-wire PTC temperature sensor, allowing temperature information to be used directly within the control program.

Real-time clock: This version does not include an RTC. Applications requiring weekly, annual or calendar-based scheduling should use the RTC-equipped AR2-A-230VAC-14D version.

Ladder programming and internal functions

The AR2 series is programmed using GEMO Ladder Editor. The ladder workspace provides 256 program lines, 5 contact columns and 1 output column. Rising-edge and falling-edge functions can be assigned to contacts where required.

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

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

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

Timer resolution: Minimum timing resolution is approximately 10 ms. Timer accuracy is specified as ±0.1% or 1 digit, whichever is greater.

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

Servo and step motor control

The relay-output AR2-A-230VAC-14D 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 specifically designed for high-speed motion control.

PID control

A built-in PID control algorithm is not provided. Closed-loop temperature, pressure, flow or similar process-control applications 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, three programmable front-panel function keys and a three-level password-protected menu system. Machine status, timer values, counter values and operator messages can be displayed directly on the unit.

Can an external HMI be connected? Yes. A compatible operator panel / HMI can be integrated using the appropriate communication hardware.

For Modbus RTU communication, the appropriate AR2-S-24VDC-MB1 communication gateway and compatible controller software are required. The RS-485 expansion interface should not automatically be treated as a standard direct Modbus HMI port.

I/O expansion and RS-485

Compatible AR2 expansion modules can be connected through the controller's RS-485 expansion interface. Depending on the selected expansion module, the complete system can be expanded to approximately 28 digital inputs and 20 digital outputs.

RS-485 cabling: Use twisted, shielded, 2-core 24 AWG communication cable. A-to-A and B-to-B polarity should be maintained, and shielding and line termination should follow the manufacturer's installation instructions.

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.

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, signal and communication wiring should be separated from power wiring wherever practical. Proper grounding and shielding should also be applied.

Because this version is powered directly from the AC mains, correct isolation, overcurrent protection and physical separation between mains wiring 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 Gemo 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.