Question: Some vendors describe the addresses of their drivers in particular ways; therefore, the process of interpreting the Modbus addresses prefixes can become rather complicated. So, how can I establish…
Question: A common problem faced by Modicon Modbus Master driver is the following: communication takes place as usual, however the values to be read are different from the ones expected.…
Question: With Modbus driver, certain operations (especially when reading FLOAT-type variables) can take place, but the values are not sorted out in the order they were expected; that is, bytes…
Question: The standard for Modbus protocol establishes that to every address there is a corresponding 16-bit space. However, there are some devices that address their memory in 8-bit groups. In…
Question: A common issue faced by Modbus driver is this: the communication takes place, but the tag displays an error message. According to the driver log, you can identify a…
Question: A common issue faced by the Modbus driver is when the device’s address is discontinuous, that is, there are gaps between the addresses. In that case, some memory spaces…
The Modbus protocol is an open standard protocol. This means that it has no licensing fees, which represents a considerable financial advantage for your project; because of this, a large…
Question: How can you fix communication issues with Modbus and multiple slaves with a RS-485 converter? I have a Modbus Master driver (Modbus-TCP) protocol connected to an Ethernet/RS485 converter; the…
To establish communication between Arduino and Elipse E3 or Elipse SCADA, the hardware must be PLC- or RTU-like, that is, it must have a communication protocol that is programmed to…
The goal of this article is to provide details to the bytes that are part of the structure of Modbus protocol’s “03” Function. These bytes can be visualized via log…