VACON DEVICENET INTERFACE
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7.
VACON DEVICENET INTERFACE
DeviceNet provides two different types of messaging. They are called
I/O Messaging
and
Explicit
Messaging
.
7.1
I/O Messaging
I/O polling messages are for time-critical, control-oriented data. The messages are transferred
between the devices all the time and they are used for continuous control of the frequency converter.
They provide a dedicated, special-purpose communication path between a producing application
(master) and one or more consuming applications (slaves). They are exchanged across single or
multi-cast connections and typically use high priority identifiers. I/O polling messages contain no
protocol in the 8-byte data field. The meaning of the message is implied by the connection ID (CAN
identifier). Before messages are sent using these IDs, both the device sending and receiving them
must be configured. The configuration contains the source and destination object attribute addresses
for the master and the slave.
Figure 7-1. DeviceNet I/O Messaging
The contents of the data message can be chosen the following way: Monitoring Data Object (0xAA),
Instance 1; Attributes 120 (Input Assembly) and 121 (Output Assembly). See the following chapter for
the Input and Output Assemblies.
Data (Output Assembly)
Data (Input Assembly)
M a ster
Sla v e
Summary of Contents for NX OPTC7
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