Fig. 16 Structure Of The Ads Communication - Beckhoff CX8180 Manual

Ethernet X001 Interface
Fig. 16: Structure of the ADS communication.
AMSNetID
The AMSNetID provides a reference to the device that is to be addressed. This is taken from the MAC
address of the first Ethernet port (X001) and is printed on the side of the CX80xx. For the AMSNetID the
bytes 3..6 plus ".1.1" are typically used.
Example:
MAC address 00-01-05-01-02-03
AMSNetID 5.1.2.3.1.1
Port number
The port number distinguishes sub-elements in the connected device.
Port 851: local process data PLC runtime 1
Index group
The index group distinguishes different data within a port.
Index offset
Indicates the offset, from which reading or writing the byte is to start.
Len
Gives the length of the data, in bytes, that is to be read or written.
TCP port number
The TCP port number for the ADS protocol is 48898 or 0xBF02.
56 Version: 1.5 CX8180