Gemo AR2-A-24VDC-14D-TR – Expandable PLC / Smart Relay with Transistor Outputs

Gemo AR2-A-24VDC-14D-TR is a compact, expandable PLC / smart relay designed for 24 VDC automation applications. The controller provides 14 digital inputs and 10 PNP transistor outputs and has been offered on our website since 2011.

Supply and I/O specifications

Supply voltage: Nominal 24 VDC, with an operating range of approximately 18–32 VDC. Maximum power consumption is 6 W.

Digital inputs: 14 digital inputs for 24 VDC signals. Standard digital input filter time is at least 8 ms for ON→OFF and OFF→ON transitions.

Digital outputs: 10 PNP transistor outputs. Maximum transistor output rating is 32 VDC / 0.3 A. The 250 VAC / 2 A specification used for relay-output AR2 versions does not apply to this transistor-output model.

Analog input: This version has no general-purpose 0–10 V analog input.

Analog output: Not available.

Real-time clock: This version does not include RTC. Applications requiring date, time, weekly or annual scheduling should use an RTC-equipped AR2 model.

Temperature sensor input: 1 input for a 2-wire PTC temperature sensor, covering approximately -50 to +150 °C. The PTC input is a dedicated temperature input and should not be considered a standard analog voltage input.

Programming and control functions

The controller is programmed using GEMO Ladder Editor. The ladder programming area provides 256 lines, 5 contact columns and 1 output column. Rising-edge and falling-edge contact functions are supported.

Programs are transferred through the RS-232 programming interface using a suitable programming cable.

Available software functions include 32 timers, 32 16-bit counters with up/down counting, 32 offset counter comparators and 16 hysteresis comparator functions.

Ladder scan time: Up to 10 ms.

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

High-speed counter inputs: Minimum ON and OFF times are approximately 1.25 ms. These inputs are intended for faster pulse counting and should not be confused with high-speed motion-control outputs.

Servo and step motor control: This model has no dedicated high-speed pulse / direction output. For positioning applications using servo and step systems, a PLC or motion controller with suitable high-speed pulse outputs should be selected.

PID control: The controller does not include a built-in PID algorithm. Applications requiring closed-loop PID control should use a controller supporting PID control or an appropriate PLC.

Display and operator functions

The unit includes a 2 × 16 character backlit LCD display, three programmable front-panel F keys and a three-level password-protected menu system. Multiple user screens can be created for process values, status information and operator messages.

Can an external HMI be connected? Yes. An external operator panel / HMI can be connected using the appropriate communication hardware. For Modbus RTU applications, the suitable AR2-S-24VDC-MB1 gateway and compatible software are required. The RS-485 expansion interface should not automatically be treated as a direct Modbus HMI port.

Expansion capability

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

RS-485 cable: A twisted, shielded, 2-core 24 AWG communication cable should be used. Wiring and termination should follow the manufacturer's installation instructions.

Operating conditions

Operating temperature: 0–50 °C.

Protection class: IP20 according to EN 60529.

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

Terminal tightening torque: Maximum 0.5 N·m.

EMC: EN 61000-6-1 and EN 61000-6-3 requirements should be considered. When the controller is installed in the same cabinet as AC motor drives, frequency inverters, contactors or other electrical noise sources, proper grounding, shielding and cable separation practices should be applied.

Gemo AR2 software and documentation

Download the Gemo PLC programming software – GEMO Ladder Editor V2.4 or refer to the Gemo AR2 PLC English user manual for programming and configuration information.

For other Gemo products and pricing, visit the Gemo price list, Gemo Electronic main page or our PLC group main page.

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

Important: Installation, wiring and commissioning of the Gemo AR2 controller should be carried out only by qualified technical personnel. Disconnect all power sources before wiring or servicing the unit. Installation should comply with the manufacturer's instructions and the electrical and machinery safety requirements applicable in the country where the equipment is installed.