Every technical device has limited performance. For the MiniPLC, the original “soft” limitation, or rather reccomendation, was maximum 120 HW data points, which gives about 3 MCIO modules plus some binary input modules to reach the required I/O mix. In this configuration, and with application software typical for the normal HVAC plants, there is absolutely no problem with memory capacity, I/O bus response, web server response, computation cycle and other parameters.
Our customers discovered soon that there is some unleashed power in the Mini, and started to challenge the limits. When increasing the amount of I/Os (and corresponding function blocks in the IDE which serve them) it must be considered that the web server response is slower, and the refresh time in the clients (such as IDE, OPC server, and SCADA) increases, but everything keeps running.
However, one of the unsurpassable limits is the amount of communication channels:
- there may be maximum 3 channels of the same type, and
- the total amount must be less or equal 5.
So, if we have a COM port with I/O modules, a SMS modem, and three Native SoftPLC channels to read the link from other process stations, this is exactly the limit.
- the total number of connections the MiniPLC is able to keep is 10.
This includes those max. 5 channels plus incoming connection from the clients like Vision, IDE, touchscreen, external web panel, Native channels from other PLCs (!) etc.
In case you face a MiniPLC not communicating on some of the channels, even if tests in the IDE are OK, please check the amount and types of the communication channels. (The problem may be somewhere else, too, see also http://domat-int.com/forums/topic/miniplc-nekomunikuje-na-com2)
Those limitations do not apply for the Windows platform (Full).
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We would like to inform you about the release of the new version of Merbon SCADA 1.5.3 software on our website. This release includes modifications to both the service itself and the Merbon SCADA installer.
The main focus is on air conditioning and consumption measurement, familiarization with our product news and an invitation to trainings that await us by the end of this year.
This year on Amper exhibition was full of our HW and SW news. Read our quick report!
The training is designed for PLC and SCADA programmers, but also for others interested in integrated systems with Modbus RTU and TCP protocol.
This training is focused on new development tool Merbon IDE.
This training is used for basic introduction to the system. We will guide you through the installation of software and show how to work with Merbon SCADA.