The Simatic Fetch/Write communication via Ethernet network is a point-to-point connection between an ADwin system and a Simatic PLC. The connection enables write and read-only access to the system memory of the Simatic PLC. Access is available to data modules, flags, inputs, outputs, counters and timers.
The ADwin system is the client which runs the active part of communication. Seen from Simatic S7, the communication function is passive and needs to be configured only. The PLC cannot access the ADwin system.
Requirements for access to a Simatic PLC:
In an ADbasic process, a global parameter controls the communication with the PLC. The sent and received data as well as the configuration data for commuication are stored in global arrays.
Parameters to be configured:
Further information ( pdf, 270 kB)
Supported Simatic CPs
Generelly, all CPs may be used which support the fetch/write protocol via TCP.
The approved CPs are listed in the linked PDFs in chapter 2.