Analyzer - Feature - Description

DeviceNet Measurement & Automation Explorer

What is Message Body Format?

The request messages transmitted over an explicit messaging connection should conform to the specific format. The following table shows the format of a nonfragmented explicit request.

7 6 5 4 3 2 1 0
Frag[0] XID MAC ID
Class ID
Instance ID
Service Data (Optional)

Message body format specifies that the Class ID and Instance ID are 8 or 16-bit integers. The following table describes the message body format values.

Value Meanings
DeviceNet(8/8) Class ID = 8 bit integer. Instance ID = 8 bit integer.
DeviceNet(8/16) Class ID = 8 bit integer. Instance ID = 16 bit integer.
DeviceNet(16/16) Class ID = 16 bit integer. Instance ID = 16 bit integer.
DeviceNet(16/8) Class ID = 16 bit integer. Instance ID = 8 bit integer.