Siemens Simatic S7-1500 Manual - Page 9

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2 Introduction

2.3

Function principle

The application example demonstrates the necessary steps to configure the

SIMATIC S7-1500 to operate as EtherNet/IP Scanner with the help of the

LCCF_EnetScanner function block.

The communication will use both transport protocols mentioned above. The

Scanner is configured to exchange data with two Adapters. One adapter is the

ET200SP MF in EtherNet/IP fieldbus mode. The second adapter is represented by

the S7-1200 using the also available LCCF_EnetAdapter function block.

This is schematically shown on the next page's figure.

Figure 2-2: schematic functional principle

SIMATIC S7-1200

(EtherNet/IP field device)

SIMATIC ET200SP MF

(EtherNet/IP field device)

The communication is established by the Scanner using a TCP connection. After

registering the Scanner with the Adapters, a transport connection is negotiated with

each of the Adapters. Once this is successfully done, the transport connection is

opened, and the data exchange takes place using UDP datagrams.

There are two more terms associated with EtherNet/IP.

•

Originator: is the device, which initiates the transport connection. This is

typically the Scanner.

•

Target: is the device, which accepts the transport connection. This is typically

the Adapter.

In this application example the transport connection uses UDP transport and

unicast communications. With EtherNet/IP the target may also vote for a multicast

connection. The target would then send the sensor data to many devices (incl. the

originator) instead of only to the originator.

NOTE

In this application example the terms Adapter and Target as well as Originator

and Scanner are used as synonyms. This is correct for this application example.

In other scenarios this might not hold true anymore.

EtherNet/IP Scanner

Entry-ID: 109782314,

V1.1.0,

04/2021

SIMATIC S7-1500

(EtherNet/IP scanner)