What is the PLC protocol
ADwin-Interface to the S7-PLC
Communication via Ethernet
The Simatic Fetch / Write communication via the Ethernet network is a one-to-one connection between an ADwin system and a Simatic PLC. The connection enables read and write access to the Simatic system memory areas. There are access options to data blocks, flags, inputs, outputs, counters and timers.
As a client, the ADwin system is the active part of communication. From the point of view of the Simatic S7, it is a passive communication function that only needs to be configured. The PLC cannot access the ADwin system.
Requirements for access to Simatic-PLC:
- ADwin system with an Ethernet interface of type ENET2 with current firmware and bootloader option.
- Simatic PLC with Communication Processor (CP) that supports the Fetch / Write protocol.
- Two projected network connections on the PLC, one each for Fetch and Write.
Function in ADwin
In an ADbasic process, communication with the PLC is controlled by a global parameter. The send and receive data as well as the configuration data for communication are stored in global arrays.
- Field numbers for send and receive data
- Number and start address of the data to be transferred
- Network configuration of the PLC: IP and port numbers
- Type of system block (DB, marker, etc.)
- TCP / IP timeout and polling time
Additional Information ( pdf, 270 kB)
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