Acyclic data (service data)
The ML
G-2 supports explicit messaging via TCP/IP. Manufacturer-specific classes 100,
101, 102, 103, and 104 enable access to the MLG-2.
Prerequisites
The following prerequisites must be met:
•
The MLG-2 must be connected correctly to the control (see "T-connector for MLG-2
WebChecker connection", page 45).
•
A correct address must be configured for the MLG-2.
10.3.2 Common industrial protocol (CIP)
Ethernet/IP uses the CIP at the process level. This protocol is used to control processes
in a similar wa
y to how FTP serves to send files, for example.
Figure 59: CIP and other services
1
Process level
2
Communication levels
3
Physical level
4
Explicit messaging
5
Implicit messaging
The MLG-2 meets the guidelines of the Ethernet/IP protocol according to IEC 61784-1.
CIP object model
For ne
twork communication, Ethernet/IP uses an “object model”, in which all the func‐
tions and data of a device are defined.
The most important terms are explained below:
•
Class
A class contains related objects of a device, organized into instances.
•
Instance
An instance consists of various attributes, which describe the properties of this
instance. Different instances in a class have the same services and the same
attributes. They can, however, have different attribute values.
10 THE MLG-2 WEBCHECKER IN THE FIELDBUS NETWORK
70
O P E R A T I N G I N S T R U C T I O N S | MLG-2 WebChecker 8025190/2020-01-13 | SICK
Subject to change without notice
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