1756-DNB

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-DNB

Type

DeviceNet scanner module

Application

Communication module

Used with

ControlLogix 1756 chassis

Number Of Channels

1

Communication rate

125 Kbps (500 m max), 250 Kbps (250 m max), 500 Kbps (100 m max)

Conducted RF immunity

10Vrms with 1 kHz sine-wave 80% AM from 150 kHz...80 MHz

Current draw

400mA @ 5.1V DC, 0mA @ 24V DC

DeviceNet connector torque

0.56 nm

DeviceNet current draw

60mA @ 24V DC

DeviceNet port

1 DeviceNet open-style 5- or 10-pin linear plug

DeviceNet power

To comply with the CE low voltage directive (LVD), the DeviceNet network must be powered from a source compliant with the safety extra low voltage (SELV) or protected extra low voltage (PELV). To comply with UL restrictions, the DeviceNet network must be

DeviceNet voltage range

11...25V DC CL 2/SELV

EFT/B immunity

±3kV @ 5kHz on DeviceNet ports

Emissions

CISPR 11: Class A

Enclosure type rating

None (open-style)

ESD immunity

6 kV contact discharges, 8 kV air discharges

Isolation voltage

50V (continuous), basic insulation type, DeviceNet network to backplane, Type tested at 853V AC @ 60s, No isolation between USB and backplane,

Module location

Chassis based, any slot

Number of nodes, max

64 nodes

Operating temperature

0 to 60 °C

Power dissipation

3.5 W

Radiated RF immunity

10 V/m with 1 kHz sine-wave 80% AM from 80...2000 MHz, 10 V/m with 200 Hz 50% Pulse 100% AM @ 900 MHz, 10 V/m with 200 Hz 50% Pulse 100% AM @ 1890 MHz, 3 V/m with 1 kHz sine-wave 80% AM from 2000...2700 MHz

Relative humidity

5...95% noncondensing

Shock

Operating: 30 G, Non operating: 50 G

Slot width

1

Storage temperature

-40 °C

Suitable for safety functions

Yes

Supporting protocol for DeviceNet

Yes

Technical documents (1)

• Rockwell Automation technical data 1756-TD003

Key features

• One DeviceNet port, open-style 5 or 10-pin linear plug
• Supports up to 64 nodes on the network
• Chassis based, fits any slot, one slot wide
• Operating temperature range of 0 to 60 °C
• Supports DeviceNet and DeviceNet Safety protocols

About the Allen-Bradley 1756-DNB

The Allen-Bradley 1756-DNB is listed by Rockwell Automation as the ControlLogix DeviceNet Comms Module, described as a DeviceNet Bridge/Scanner Module. Rockwell's product data gives one channel, a maximum of 64 nodes, and communication rates of 125 Kbps (500 m max), 250 Kbps (250 m max) and 500 Kbps (100 m max). Rockwell lists a current draw of 400mA at 5.1V DC, a DeviceNet current draw of 60mA at 24V DC, and power dissipation of 3.5 W. Rockwell shows the lifecycle status as Active.

What is the 1756-DNB used for?

The module is fitted in a ControlLogix chassis, in any slot, and acts as a bridge or scanner between the controller and a DeviceNet network. Rockwell lists support for the DeviceNet and DeviceNet Safety protocols. The enclosure type rating is given as None (open-style).

Lifecycle and successor

Active.

Before you order

What to photograph or confirm so the right unit is quoted.

Check that the catalog number on the module label reads 1756-DNB, and note the series letter and firmware revision printed there. Send us a photo of the label if you need help confirming the part.