PR103 Ethernet-Enabled Mini-PLC

Programmable relays are also known in the market as:

Compact PLC, Small PLC, mini-PLC, micro PLC, Compact-PLC, industrial controller, Ethernet or RS-485 controller, automation controller.

Programmable relays are programmable logic controllers designed for small industrial automation applications with limited I/O needs. Their small size and simple design make them ideal for space-constrained applications.

Our ethernet relay PR103 can be used as an Ethernet or RS-485 controller in a wide range of applications:
For example as an air conditioning controller, for controlling a damper, colophier, fan in a ventilation system. In general, the automation controller PR103 is widely used in HVAC. Often our controller is called HVAC controller.
Also our industrial contoller is widely used for pumps. You can find such a typical application at: https://akytec.de/en/blog/water_tank_management .
Often our relay is used for lighting automation. Both standard lighting in the enterprise using touch sensors or switching lights on and off according to time, and thanks to Ethernet our controller is used for emergency lighting and warning systems in the enterprise.
To summarize, our affordable controller PR103 can be used to automate any secondary technological process in a company.

The program execution time (cycle time) is automatically adjusted based on the program complexity (Auto-Tuning). The automatic adjustment affects the data exchange via Modbus since program execution takes higher priority over processing requests. If the program is very extensive, it can consume the entire CPU time, and the Modbus data exchange will not be carried out correctly.

To avoid this issue, a lower limit is reserved for the volume of Modbus data exchange: 50 requests per second. This means that at least 50 requests per second can be executed, even if the user program is large, and even more if the program is small and the processor performance is sufficient. If there is not enough time to query all devices, the number of queries in the user program should be optimized.

The setting of the polling cycle depends on the number of variables queried and the polling frequency in the program. It is recommended to set the polling cycle to 1 second. In this case, the device can query up to 50 variables.

The minimum processing time of the program cycle is 1ms, and the signal conversion time for analog outputs is 100ms.

The PR’s has relais outputs, Relay outputs use an electromagnetic coil to actuate a switching contact. When the control voltage is applied to the relay coil, it either closes or opens the switching contacts to control the load.

Whereas PNP transistor outputs are commonly used in control circuits to switch electrical loads, such as relays, LEDs, or motors.

They are e used to provide a positive voltage signal to turn on or control a connected load. When a positive voltage is applied to the base, the transistor becomes conductive, and the collector is connected to the emitter, allowing current to flow to the load.

The main difference is that PNP transistor outputs represent an electronic method for controlling loads, while relay outputs are electromechanical devices. The choice between them depends on the specific requirements of the application and design preferences.

Digital Input: 264 V AC (for 230.x.x Version) 30VDC (for 24.x.x version)

Digital Output: AC 5A, 250 V DC: 3A, 30V

Yes, the PR-devices series can be used to monitor and control the consumption of a PV system. The PR series supports the Modbus RTU protocol, making it compatible with any energy meter that supports this protocol. The digital outputs of the series are suitable for control purposes and can, for example, redirect the current to a battery, the general power grid, or heating elements

The user program is written to the retain memory. The battery can be changed without any issues, and the program remains unaffected. It's worth noting that when the battery is replaced, the RTC will be reset. The battery typically lasts for about 8 years.

Any HMI device compatible with the Modbus RTU Protocol is of displaying process values and can be utilized as an HMI with the PR device series.

The program is stored in the retain memory, which remains unaffected in the event of a power failure. Therefore, in the event of a power failure, your PR device will retain the program and will not require reprogramming. Variables that must be stored in non-volatile memory must be marked as retain in the ALP project.

Yes the PR-devices can function as PID-Controller, our ALP Software utilizes function block language and comes with preinstalled macros like PID Controller and PWM Generator, among others.

Yes, the PR-Devices can be used to control pumping systems. Therefore, we recommend exploring the sample projects available on our website. We also offer sample projects that showcase the capabilities of PR devices, such as a press machine.

In one of these projects, we demonstrate how the programmable relay PR200 can be utilized to enhance operator safety when operating a press machine. Additionally, a counting function has been implemented, and its results are displayed.

Another example project involves a modifiable week clock. Some automation tasks require toggling secondary devices based on specific schedules, which can change over time. With this sample project you can learn how to set more importantly, modify the schedule of output activities using the PR’s function keys and screen.

If the accuracy of the input or output of the module is no longer in accordance with the specification, it can be calibrated.

Each analog input and output has its own calibration coefficients for each sensor type.

– The calibration is performed using a reference signal source connected to the device input or output.

– The calibration coefficients are calculated based of the ratio between the current input signal and the reference signal and stored in the non-volatile device memory.

– If the calculated coefficients go beyond the permissible limits, a message about the error cause will be displayed.

For further concrete instructions on page 36 in the manual shows step by step instructions on how to calibrate input/ or output

Modbus registers work as a way to store and exchange data in Modbus communication, which is a popular protocol used in industrial automation and control systems. Modbus registers are typically 16-bit values, and they are indeed represented in hexadecimal format. Here's an explanation of how Modbus registers work and why hexadecimal is used: