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Chapter 7 I/O MESSAGE
7.1 Overview
I/O Message is a communication process that cyclically transfers data between the DeviceNet master and
slave.
This option supports two types of I/O Message connections--Poll and Change-of-State connections. It also
supports four types of I/O assembly instances as data formats in I/O Message, as listed in Table 7.1. One of the
four instances can be selected for input and output each.
The I/O assembly instances should be specified using inverter's function codes o31 and o32.
- Poll connections allow the master to periodically poll the slave for data. In response to the
request, the slave sends data. In Change-of-State connections, the slave sends data only
when the data has changed.
- Input and output assembly instances should not be necessarily set to the same instance type.
(Ex. Output assembly instance = Extended speed control output, Input assembly instance =
User defined assembly input.)
Table 7.1 Configuring I/O Assembly Instances
o31, o32 Type Instance ID Description
Length
(words)
o31=20 20 Basic Speed Control Output 2
o31=0 or 21 21 Extended Speed Control Output
(Factory default)
2
o31=100 100 Fuji Drive Assembly Output 2
o31=102
Output
(from master
to slave)
102 User Defined Assembly Output 4
o32=70 70 Basic Speed Control Input 2
o32=0 or 71 71 Extended Speed Control Input
(Factory default)
2
o32=101 101 Fuji Drive Assembly Input 2
o32=103
Input
(from slave
to master)
103 User Defined Assembly Input 4
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