Simple ESP library for Beckhoff ADS

Features

• Base functions
  • Ads Read
  • Ads Write
  • Ads ReadWrite
• Convenience functions which are based on the functions above
  • Ads WritePlcVarByName
  • Ads ReadPlcVarByName
  • Ads ReadCoe (with and without complete access)
  • Ads WriteCoe (with and without complete access)

How to install

Download this repository as zip file and import it to the Arduino libraries.
(Sketch -> Include Library -> Add .ZIP Library)

Usage

• Set WiFi SSID and password in the example .ino file
• Set the SrcAmsAddr to the IP address of your ESP followed by 1.1.
• In the TwinCAT "Add Route Dialog" of the target machine you have to add the IP of this ESP. Make sure, that you have set the "Remote Route" to "None"

Writing CoE Values

Set the DestAmsAddr and the port in the code to the AmsAddr of the slave you want to access.

Writing PLC variables

Set the DestAmsAddr in the code to the AmsAddr of the target. This usually ends with .1.1

Set the port to the port of your PLC. The first PLC usually has port 851 on TwinCAT3 and 801 on TwinCAT2. The port is also available as define. (AMSPORT_R0_PLC_TC3)

Limitations

To save some memory, the lib can read and write a maximum ammount auf 64 bytes. This value can be increased by overwriting the #define ADS_MAX_DATA_SIZE in ads.h

Current status/To Do

• The Lib is tested insufficiently
• Should work with ESP8266, but not tested
• The ADS Read, Write and ReadWrite function are mostly identical. With some affort this three functions can share the same code.

Debugging

• For some debug outputs on the serial console set #define ADS_DEBUG_PRINT_ENABLE = 1
• DebugPrintHex() can be used to print a hex dump in a format like a hex editor