Update ESP8266 Industrial Modbus TCP IP V2.0
A long time ago I found a group of people in forums.adafruit already had an advance and example have been implemented and improvements suggested by ibbba for the contribution.
The programming code for ESP8266 in this case was implemented in Arduino IDE versions 1.6.4 above. These 2 tutorials indicate connection and basic programming ESP8266 01 and 03 modules.
TUTORIAL
TUTORIAL
ESP8266 - 01 Modbus Slave TCP IP (Ethernet) for Industrial Applications
CONCLUSIONS
In previous tests with the library Original ModbusTCPSlave, it had two drawbacks of application:
Code Execution
properly functioning communication modbus tcp, but do not run the code in the routine void loop, as a temporary solution the library for ESP8266 amending stop the connection and reconnect again, the problem with this method is time reconnection can make the teacher while accepting the data indicate error in data reception.
Serial port
Originally ESP8266 the serial port was used as a debug port in hexadecimal, I have made changes to the library so that Serial can be used freely.
VIDEO Update ESP8266 Industrial Modbus TCP IP V2.0
With the new modifications it has been omitted disconnection allowing a constant flow of communication if stop the connection between the ESP8266 and modbus tcp master mandatory.
Ticker
He has implemented Ticker library created and documented by igrr, it is an object to call a given function with a certain period. Each Ticker calls a function. You can have as many as you like tickers, the only memory limitation.
Important note: When creating tickers consider not create any delay would affect both modbus communication protocol, such as the execution of that function.
TESTING
the connection between the ESP8266 and a simulator configured as master Modbus tcp was made.
-initially The Ticker Parada is created.
CODE DESCRIPTION
call the function value is created and defined 2 Holding Registers:
Mb.MBHoldingRegister[0] = Holding Registers 1Mb.MBHoldingRegister[1] = Holding Registers 2
Mb.MBHoldingRegister[0] send a random(0,51) value to the Modbus Master and validate the upgrade value.
modbus routine Mb.Run(); is executed; and execute the Ticker Parada.attach_ms(25,valor); every 25ms doing the value created in the function.
Taking this example as a basis, they could perform management functions for I / O similar and digital, load and others, taking only into account not implement any delay.
POSSIBLE INDUSTRIAL APPLICATIONS
Industrial software integration with OPTO 22
References
Arduino Mega 2560 Oled Display I2C Master Modbus RTU Scada Industrial Connection
Arduino + ESP8266 + Software Opto22 example Scada Industrial
More Info:
Youtube Channel
PDAControl
