Avtron HS6M Petunjuk Manual - Halaman 8
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DeviceNet Protocol "D"
The DeviceNet protocol provides a set of data bits inside a DeviceNet
message that represent the encoder position (in turns and within 1
turn).
DeviceNet may be wired in several different configurations, but the
most common is a "Trunk and Drop Line" configuration. The trunk
message cable must be terminated at each end with 120 ohm
resistors. Note that DeviceNet also offers the option to carry device
power to each encoder through an additional cable pair of wires.
Preferred cable: Nidec Avtron recommends structured DeviceNet
wiring systems, available from a broad range of vendors. Large
diameter main, small diameter round cable, as well as flat cabling
systems are all acceptable.
For more details on DeviceNet, consult the Open DeviceNet Vendor's
Association (ODVA):
www.odva.org
Network
Baud
500K
250K
Rate
Max.
325
800
Length*
[100]
[250]
Max.
Single
15
15
Tap
[5]
[5]
Length
Max.
Total
100
200
Tap
[30]
[60]
Length
Min. Tap
20
20
to Tap
[6]
[6]
Length
Setting Node (MAC-ID), Baud Rate & Termination Resistor
To set the node MAC-ID number: write attribute 6Fh (byte).
To set the baud rate: write the baud code to attribute 6Eh (byte).
Network
Baud
500K
250K
Rate
Baud
02h
01h
Code
Remember, these values are not stored permanently and do not take
effect until they are written to EEPROM. If power is cycled before the
values are stored, the encoder will default to the values previously
stored in EEPROM.
To enable the termination resistor: write 01 to attribute 67h. Ensure
any devices on the bus power up at least 700mS after the encoder
with the termination resistor activated.
Measuring Position, Speed, and Acceleration
Only position feedback is supported in DeviceNet; acceleration and
speed are not available at this time.
To read position feedback into your device: Following the
instructions for your master/scanner module for the DeviceNet
network, load the encoder EDS file into your configuration. Assign it
to the correct MAC-ID node number. Store the configuration to the
scanner module.
All of the position data and other parameters will be read by
the scanner module and placed in registers identified in the
125K Units
1600
ft
[500]
[m]
15
ft
[5]
[m]
400
ft
[120]
[m]
20
ft
[6]
[m]
125K Units
00h
configuration package.
Setting Polling, Cyclic and Sync Mode
Polling, cycling and sync mode are supported by the encoder; use
the parameters supplied in the EDS file to set the appropriate mode.
Store the resulting configuration into the scanner module.
Storing/Saving Encoder Parameters to EEPROM
To store the current encoder operating parameters into non-volatile
memory:
Send message [(master MAC-ID) 32h 23h 01h]. A new allocation is
then required to resume receiving position values from the encoder.
Other Parameters
Contact Nidec-Avtron or review the EDS file for additional
parameters, diagnostic registers, cam and programmable limit
switch functionality and other advanced features.
HS6M
8