Module Characteristics; Communication Model; Message Groups; Message Types - WAGO I/O System 750 Series Manual

4.4 Module Characteristics

The I/O module is defined by vendor ID and device type.
Vendor ID
Device Type

4.4.1 Communication Model

4.4.1.1 Message Groups

CAN messages are divided into several groups in order to achieve different
priorities.
• message group 1 serves to exchange I/O data via I/O messages
• message group 2 is reserved for Master/Slave applications
• message group 3 serves to exchange configurations data via explicit mes-
• message group 4 is reserved for system administration (i. e. Offline Con-
The CAN Identifier (Connection ID) and with it the priority is built via differ-
ent message groups and the MAC ID.

4.4.1.2 Message Types

DeviceNet has 2 types of messages:
• I/O Messages and
• Explicite Messages
4.4.1.2.1 I/O Messaging
I/O messages are sent by a node and can be received by one or several other
nodes. Only I/O data is transmitted and no protocol data is specified by this
way.
4.4.1.2.2 Explicit Messaging
Explicit messages are sent directly from one node to another. They consist of a
request and an answer. Therefore services can be requested directly from an-
other node. The data field consists of the service identification and the destina-
tion address. The format of the explicit messages is defined. Via explicit mes-
sages devices can be configured or a dynamic built-up of message connections
can be made.
WAGO-I/O-SYSTEM 750
DeviceNet
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Module Characteristics
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