The EasyTool MFC software program is used for configuration and parameterization. The modules from function block libraries can be put together on the PC using drag & drop to create the desired process sequence.

© Hesch Industrial Electronics

So why not use a modern controller platform as an alternative to often cost-intensive PLC systems, which is suitable for far more than just thermal processes and can be used in freezers, melting or holding furnaces as well as process computers or in pump control? One example of such devices is the multifunction controller (MFC) from Hesch.

It enables users and process engineers to create complex sequence controls themselves - without having to write a single line of source code. The MFC can control several processes simultaneously and supports almost all common methods used in the process industry, such as limiting, ratio or cascade control.

... as well as for complex (thermal) processes without having to program.

© Fotolia / Pavel Losevsky

The function blocks required for this are available in corresponding libraries. To create applications, these blocks can be combined and wired to the desired process sequence using the 'EasyTool MFC' PC software via drag & drop. The tool can also be used to create user-defined operating pages, program sequences and applications. These can be tested using a simulation function before they go live. The online display of process values not only supports the program test, but also ensures smooth commissioning of the controller platform.

In addition, three further functions make work even easier: with the 'Data Logger', the user can load log data stored on the device into EasyTool MFC and export it as a CSV file. This allows the process data to be saved locally on the PC and viewed and analyzed clearly in tabular form. The new block search function displays all blocks used in the project clearly in a tree structure. They can also be searched by type or name. This is particularly helpful for larger and more complex projects, which can quickly become confusing. Finally, the 'Cross-references' function displays all sources with their assigned sinks and HMI variables with their assigned controls. A mouse click on an element takes the user directly to the position of the element in the function block diagram or in the editor.

Slots for two I/O cards are located on the rear of the multifunction controller. The I/Os are on galvanically isolated 'potential islands' to prevent measurement value distortions due to potential differences.

© Hesch Industrial Electronics

As far as the hardware itself is concerned, the panel-mounted housing of the MFC measures just 98 mm × 98 mm × 115 mm without connectors, which saves a considerable amount of space in the control cabinet. Thanks to protection class IP65, the device is also dust-tight and can withstand water jets and wet environments from the front. The temperature range of the controller is designed for 0 to 55 °C. A resistive 3.5-inch touch display is used to operate and display the values. There are also four freely programmable function keys and two LEDs for status displays on the front of the device. An electrically isolated micro USB port on the front of the device ensures secure data transfer.

With the ARM Cortex A8, the intelligent controller has an economical yet powerful CPU that is suitable for industrial applications. The multifunctional controller is also equipped with a power-failure-buffered real-time clock; 2 GB are available internally as mass storage for log data. Communication can take place via Profinet, Profibus, Modbus, CAN bus or HPR bus using appropriate couplers. This also allows applications outside the control cabinet and the connection of several nodes.

The controller's I/O cards each have two universal inputs, standard signal inputs and analog outputs as well as six digital connections. Users can configure the latter individually as inputs or outputs, two of which can optionally be configured as fast counter inputs. The analog inputs each have two channels for temperature measurements, while the analog outputs are equipped with a voltage and a current output. If required, the I/Os can also be expanded with the HIMOD system from Hesch.

The MFC is also available as a starter set to get you started with multifunction controllers. In addition to the controller itself, it contains a communication card for Ethernet and RS485 as well as an I/O card with numerous analog and digital inputs and outputs. The case also includes a USB connection cable, a USB stick with the PC software and a USB dongle with a license for data transfer from the PC to the controller.

Author:
Peter Pschichholz is Commercial Manager at Hesch Industrie-Elektronik.