Allen-Bradley 1734-ADN Manual de usuario Pagina 17

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Publication DNET-UM004A-EN-P - March 2004
Before You Begin 1-5
Choose a Scanner
The DeviceNet scanner connects a controller to the devices on a
DeviceNet network.
To organize your devices into a DeviceNet network, either:
scanner
module
device device device
Input
Memory
DINT
DINT
DINT
Output
Memory
DINT
DINT
DINT
controller
The scanner collects input data from
the devices on the network…
…and sends the data to the devices.
…and sends the data to
the controller.
controller
data
The scanner collects output
data from the controller…
This option: Has these advantages: And these disadvantages:
single network lower cost
1 network to manage
scanner is local to the controller
shorter distances
more devices on the network = slower
performance on that network
more power supply requirements
subnets shorter runs on subnets, more total distance
fewer devices on the subnet = faster performance
on the subnet
simpler power supply requirements
higher cost
multiple networks to manage
scanner is remote from the controller
device device device device
Place all your devices on a single network and
connect the controller directly to the network via
the scanner.
device
scannercontroller
device
linking
device
device device
controller
device
linking
device
device device
Break up your devices into several smaller
distributed networks (subnets). Place a scanner
(linking device) on each network. Connect the
scanners to the controller via an EtherNet/IP or
ControlNet network (backbone).
main network
subnets
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