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Chapter 8
EXPLICIT MESSAGE
8.1 Overview
Explicit Message is a communication process that accesses DeviceNet variables at arbitrary (event-driven)
timing. Using the communications card is capable of accessing not only standard DeviceNet variables but also
all inverter's function codes. Explicit Message lacks realtime performance, but it allows many variables to be set
or referred to. It is, therefore, suited for initial setting.
Refer to the user's manual of the connected master for Explicit Message.
- Variables usable in Explicit Message are grouped using three codes--Class (major key), Instance
(medium key) and Attribute (minor key). These three codes should be used for specifying a variable.
- A group of all variables contained in Class is called "Object."
8.2 Objects to be Used in Explicit Message
This section describes objects relating to the communications card and the inverter. Other objects that are
automatically executed by the master device are excluded in this manual.
(1) Identity object (Class 01 hex.)
This object refers to the product information of the communications card. It is a group of read-only variables.
Instance
Attribute
1
01
Vender ID
02
Device Type
03
Product Code
04
Revision
05
Status
06
Serial Number
07
Product Name
(2) Motor Data object (Class 28 hex.)
This object refers to and sets up the motor rated current and voltage. When Motor 2, 3, or 4 is selected, this
object automatically switches to the one for Motor 2, 3, or 4.
For details about motor switching, refer to the FRENIC-MEGA Instruction Manual, Chapter 5, Section 5.2
"Details of Function Codes."
Instance
Attribute
1
03
Motor Type
06
Rated Current
07
Rated Voltage
Name
Description
Manufacturer's ID code
Applied device profile
ID code of the
communications card
Software version
(Major and minor versions)
Status of the communications
card
Serial number of the product
Model name
Name
Description
Type of motor to be
connected
Rated current in units of 0.1 A
Rated voltage in units of 1 V
(base voltage)
Value (hex.)
013F (=319):
Fuji Electric Group
0002: AC drive
2403
Display of version
Example: 01, 0A
(=Ver. 1.10)
Depends on DeviceNet
specifications.
Differs with the product.
OPC-G1-DEV
Value (hex.)
07: Squirrel-cage,
induction motor
Depends on the
inverter setting.
Depends on the
inverter setting.
28
R/W
Data size
R
Word
R
Word
R
Word
R
Byte,
Byte
R
Word
R
DWord
R
11 bytes
R/W
Data size
R
Byte
R/W
Word
R/W
Word
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