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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 the
inverter.
The communications card supports two types of I/O Message connections--Poll and Change-of-State
connections. It also supports five types of I/O assembly instances as data formats in I/O Message, as listed in
Table 7.1. One of the five 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 inverter for data. In response to the request,
the inverter sends data. In Change-of-State connections, the inverter sends data only when the data
has changed.
Function code
o31, o32
o31=20
(from master to inverter)
o31=0 or 21
o31=100
o31=102
o31=104
o32=70
(from inverter to master)
o32=0 or 71
o32=101
o32=103
o32=105
If the "Request for Access to Function Codes" (o31=104) is selected for output, it is recommended that
the "Response to Function Codes Access Request" (o32=105) be selected for input in order to confirm
that data is correctly written in the function code. Other input and output assembly instances should
not be necessarily set to the same instance type.
(Ex. The following combination is also available:
Output assembly instance = Extended speed control output
Input assembly instance = User defined assembly input.)
Once you have modified the o31, o32, o40 to o43 and o48 to o51 data, be sure to restart the inverter
or use the RESET service to validate the new settings.
For details about the RESET service, refer to the DeviceNet's or Configurator's manual.
To stop auto tuning triggered via DeviceNet halfway, use the BX terminal command assigned to any of
digital input terminals ([X1] to [X9], [FWD] and [REV]). In the FRENIC-MEGA series of inverters, BX is
assigned to digital input terminal [X7] by factory default.
Whether the inverter has terminals [X8] and [X9] depends upon the product specifications of the
FRENIC-MEGA inverter. For details, refer to the FRENIC-MEGA Instruction Manual, Chapter 5
"FUNCTION CODES."
Table 7.1 Configuring I/O Assembly Instances
Instance
Type
ID
Output
20
21
100
102
104
Input
70
71
101
103
105
Description
Basic Speed Control Output
Extended Speed Control Output
(Factory default)
Fuji Drive Assembly Output
User Defined Assembly Output
Request for Access to Function Codes
Basic Speed Control Input
Extended Speed Control Input
(Factory default)
Fuji Drive Assembly Input
User Defined Assembly Input
Response to Function Codes Access
Request
16
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