![Rockwell Automation PowerFlex 750-Series Скачать руководство пользователя страница 130](http://html.mh-extra.com/html/rockwell-automation/powerflex-750-series/powerflex-750-series_user-manual_1475453130.webp)
G-2
Glossary
PowerFlex 750-Series Drive DeviceNet Option Module User Manual
Publication 750COM-UM002A-EN-P
Controller
A controller, also called programmable logic controller, is a solid-state
control system that has a user-programmable memory for storage of
instructions to implement specific functions such as I/O control, logic,
timing, counting, report generation, communication, arithmetic, and
data file manipulation. A controller consists of a central processor,
input/output interface, and memory. See also Scanner.
Cyclic I/O Data Exchange
A device configured for Cyclic I/O data exchange transmits data at a
user-configured interval. This type of exchange ensures that data is
updated at an appropriate rate for the application and allows data to be
sampled at precise intervals for better determinism.
D
Data Rate
The speed at which data is transferred on the DeviceNet network. The
available data rates depend on the type of cable and total cable length
used on the network:
Each device on a DeviceNet network must be set for the same data rate.
You can set the DeviceNet Option Module to 125kbps, 250kbps, or
500kbps. You can set it to Autobaud if another device on the network
has set the data rate.
Datalinks
A Datalink is a type of pointer used by PowerFlex 750-Series drives to
transfer data to and from the controller. Datalinks allow specified
parameter value(s) to be accessed or changed without using explicit
messages. When active, each 32-bit Datalink in a PowerFlex 750-Series
drive consumes 4 bytes in the input image table and/or 4 bytes in the
output image table of the controller.
DeviceNet Network
An open producer/consumer Controller Area Network (CAN) which
connects devices (for example, controllers, drives, and motor starters).
Both I/O and explicit messages can be transmitted over the network. A
DeviceNet network can support a maximum of 64 devices. Each device
is assigned a unique node address and transmits data on the network at
the same data rate.
A cable is used to connect devices on the network. It contains both the
signal and power wires. Devices can be connected to the network with
drop lines, in a daisy-chain connection, or a combination of the two.
Maximum Cable Length
Cable
125kbps
250kbps
500kbps
Thick Trunk Line
500 m (1,640 ft.)
250 m (820 ft.)
100 m (328 ft.)
Thin Trunk Line
100 m (328 ft.)
100 m (328 ft.)
100 m (328 ft.)
Maximum Drop Length
6 m (20 ft.)
6 m (20 ft.)
6 m (20 ft.)
Cumulative Drop Length
156 m (512 ft.)
78 m (256 ft.)
39 m (128 ft.)
Содержание PowerFlex 750-Series
Страница 136: ...G 8 Glossary PowerFlex 750 Series Drive DeviceNet Option Module User Manual Publication 750COM UM002A EN P Notes ...
Страница 141: ...Index 5 PowerFlex 750 Series Drive DeviceNet Option Module User Manual Publication 750COM UM002A EN P Notes ...
Страница 142: ...Index 6 PowerFlex 750 Series Drive DeviceNet Option Module User Manual Publication 750COM UM002A EN P Notes ...
Страница 143: ......