As Modbus can be implemented over multiple transmission mediums we learn about the physics behind its implementation over the copper wire medium in terms of the following subjects:
- Electrostatic Interference
- Electromagnetic Interference
- Signal Attenuation
We look at Serial Modbus over RS485, RS232 and RS422 and also wireless and remote monitoring (GPRS) solutions (also for Modbus TCP). The course then covers the Modbus protocol versions in more detail:
- Modbus RTU
- Modbus ASCII
- Modbus TCP
Students will learn the Modbus Message frame formats and how to decode Modbus messages. It is also explained how Modbus operates as a Master/Slave protocol.
Finally the course takes a practical look at memory access, how data is stored, data types, "Endianess", bit and byte significance and bit masking.
Each trainee will receive both theoretical and hands-on-practical training with a number of tutorials. In the practical’s the trainees will decode messages, use a Modbus simulator to manipulate register data, read in real values from temperature and proximity sensors, control a drive and transmit data wirelessly using Modbus TCP.