Description of 1786-RPA
The Allen-Bradley 1786-RPA is a ControlNet Modular Repeater
Adapter. This module is a ControlNet communication network
accessory that is primarily used to extend the length of a
ControlNet network as well as assemble different topologies such as
Star, Ring, Linear or Point-to-Point topology. This repeater module
may also be used when physically converting ControlNet cable medium
from Coaxial cable to Fiber Optic and Fiber Optic to ControlNet
coax cable.
ControlNet network is an industrial communication protocol which is
used for multi-drop communication of devices. These devices can be
a mix of ControlNet client modules, Controllers, Visualization
systems and gateways. ControlNet network is composed of a main
communication highway called as Trunk where devices or Nodes
connect via ControlNet taps. ControlNet network supports up to 1000
m of distance. If the network exceeds this maximum distance, the
1786-RPA may be used.
The 1786-RPA is compatible for use with 1786-RPCD repeater
dual-copper module, 1786-RPFS repeater short-distance fiber module,
1786-RPFM repeater medium-distance fiber module, 1786-RPFRL fiber
ring repeater module, and 1786-RPFRXL fiber ring repeater module.
The maximum allowable adapters connected in series is 20 1786- RPA.
This repeater adapter module supports direct mounting to a mounting
plate or with the use of a DIN rail. Direct panel mounting offers
an increased resistance to vibration and shock compared to DIN Rail
mounting. This module supports horizontal or vertical orientation
and powered by an external voltage supply range of 18-36VDC.
This repeater adapter module is provided with One (1) removable
terminal block for input power connections, One (1) 75 ohm
terminating resistor and Two (2) DIN rail locks.
The 1786-RPAB repeater adapter requires 24 Volt DC input power. At
5 VDC, it can provide a maximum of 1.6 A of backplane output
current. The Allen-Bradley 1786-RPAB repeater adapter serves
different functions, such as extending the network’s length,
performing network media conversions from coaxial or copper media
to fiber media, as well as the opposite way from fiber media to
coaxial or copper media, providing power to the repeater modules,
and for the creation of a ring, star, or point-to-point topology.
Both the repeater adapters and repeater modules are equipped with 2
status indicators such as Ready and Fault, which indicates powered
up fault state, respectively. The entire 1786-RPA repeater adapter
has an approximate measurement of 4 x 4 x 3 inches, or 10 x 10 x 8
centimeters, and it weighs around 7 ounces or 0.20 kilograms. This
Series B repeater adapter is also known as model number 1786-RPA/B.
Technical specifications for 1786-RPA
| Manufacturer | Rockwell Automation |
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| Part Number/Catalog No. | 178-RPA |
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| Brand | Allen-Bradley |
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| Product Family: | ControlNet communication |
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| Product Type: | ControlNet Repeater Adapter Module |
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| No. of Coax Channel: | One (1) |
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| Mounting: | Panel Mount / DIN Rail |
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| Mounting orientation: | Vertical / Horizontal |
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| Supported Topologies: | Star, Linear, Ring, Point to Point |
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| Power Supply, nominal: | 24VDC |
|---|
| Power Supply, range | 18-36VDC |
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| Power Consumption, max: | 16.8 W |
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| Power Dissipation, max: | 8.8 W |
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| Backplane output current, max: | 1.6A @ 5V DC, max |
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| Wire size: | 0.21…3.3 mm2 (24...12 AWG) solid or stranded copper wire that is
rated at 105 °C (221 °F), or greater, 1.2 mm (3/64 in.) insulation
max for power connections |
|---|
| Operating Temperature: | EC 60068-2-1 (Test Ad, Operating Cold), IEC 60068-2-2 (Test Bd,
Operating Dry Heat), IEC 60068-2-14 (Test Nb, Operating Thermal
Shock): 0...60 o C (32...140 o F) |
|---|
| Non-Operating Temperature: | IEC 60068-2-1 (Test Ab, Un-packaged Nonoperating Cold), IEC
60068-2-2 (Test Bc, Un-packaged Nonoperating Dry Heat), IEC
60068-2-14 (Test Na, Un- packaged Nonoperating Thermal Shock):
–40...85 o C (– 40...185 o F) |
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| Product Line | ControlNet Repeater |
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| Repeater Type | Modular Repeater Adapter |
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| Fiber Type | RG6 copper coax |
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| Fiber Operating Wavelength | NA |
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| Attenuation Levels | NA |
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| Input Power | 24 Volts DC |
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| Typical Repeater Distance | NA |
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| Backplane Output Current | 1.6 A |
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| UPC | 10612598171092 |
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The Allen-Bradley 1786-RPA is a ControlNet Modular Repeater
Adapter. This module is used to extend the length of the ControlNet
network. Tit has One (1) Coax cable port, powered by a 24VDC power
supply. This module supports direct panel or DIN rail mounting and
compatible for horizontal and vertical mounting.
