6. Operating with DeviceNet Communications
61
* 1. The speed scale can be set with AC/DC Drive object attribute 16 through
explicit message communications.
* 2. When using the Speed Actual monitor, always set the Number of Motor
Poles (2 to 39) in Inverter constant n035 (Selecting Setting/Display Units
of Frequency Reference).
Extended I/O Instance (Factory Setting)
This is a standard I/O instance type defined in DeviceNet’s AC Drive
Profile and it is the initial factory setting for I/O instances. Four bytes
are used for input data and four bytes are used for output data.
• Input (Master
→
Inverter) Instance 21 (15 Hex)
Byte 0,
bit 2
Running 1
(Fwd)
Indicates the Inverter’s operating status.
0: Stopped, operating in reverse, or
applying DC injection braking
(Reverse RUN command ON).
1: Operating forward or applying DC
injection braking (Reverse RUN com-
mand OFF).
Bytes
2 and 3
Speed
Actual
Indicates the Inverter’s speed.
Monitored speed data:
Monitored frequency (r/min)
×
2
SS
(
SS
: Speed scale
*1
)
For example, when the monitored speed
data is 03E8 Hex and the speed scale is
0:
Monitored frequency = 03E8 Hex/ 2
0
=
1,000/ 2
0
= 1,000 r/min.
Byte
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3
Bit 2
Bit 1
Bit 0
0
---
Net
Ref
Net
Ctrl
---
---
Fault
Reset
Run
Rev
Run
Fwd
1
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2
Speed Reference (Low Byte)
3
Speed Reference (High Byte)
Data
Name
Contents
