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Some specific problems and their resolving about the communication with the Siemens PLCs:

Connection Problem Resolving
ISO_TCP The connection is rejected by the PLC The specified CPU slot of the PLC is wrong — try some other starting from one(1), which is tested as actual for S7-1200, S7-1500.
ISO_TCP The connection seems established but the data is not read from the PLC. It looks like you are using S7-1200, S7-1500 which has different changes in the security policy:
  • Create a data block with the compatibility to S7-300/400 and/or disable this block optimization to appear the offset column. Disable any protection of this data block.
  • If you have the message "error 33028 context is not supported. Step7 says: Function not implemented or error in telegram.", you have S7-1200 (FW4.0), S7-1500 and you must grant access for the interface functions Get/Put in the PLC configuration.
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