Integrating SenzaNET with ModBus
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When integrating wireless networks with existing fieldbus infrastructure, the biggest chunk of effort usually does not lie with the wireless network itself. Instead, aligning the wireless and the wired world is a major challenge in many cases, simply because both have been developed independently and a lot is still to be done to have them interwork easily.
E-Senza’s mission is to change that situation and provide users with a solution that not only helps them to leverage the benefits of wireless solutions, but also to make sure those are not counterbalanced by additional efforts spent when putting them together with their existing systems.
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In case of ModBus, this meant an easy mechanism of mapping ModBus’ input and output registers and the wireless devices interfaces had to be invented. We achieved this by adding a software-configuration feature to SenzaGate, which manages this mapping and lets the user define in a very simple way, how device-interfaces connected to a SenzaBlock shall be represented in ModBus.
At the same time, all configuration tasks required for setting up the wireless network can be handled through a separate maintenance port. This can be another TCP-port run over the same Ethernet as ModBus-TCP or it can be SenzaGate’s USB-port. Communication over ModBus can thus be limited to the payload traffic, which simplifies integration dramatically.
The ModBus master uses the “Read Holding Registers” standard function of the ModBus protocol to retrieve the data from SenzaGate. All data-exchange works in exactly the same way as if data from wired devices would be exchanged. It is just as easy !
Any needs regarding fieldbus-integrated wireless systems ?
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