Allen-Bradley – 1756-CNB ControlLogix Communication Module

MPN: 1756-CNB · Brand: Rockwell Automation / Allen-Bradley

Price on request

Discontinued by Rockwell Automation / Allen-Bradley — we can still source the original 1756-CNB (new, used or refurbished, subject to availability). Request a quote below.

Request a Quote

12-month warranty (new) · 3-month (used/refurbished)

30-day returns, no restocking fee on unused parts

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Quick facts

Availability	Confirmed on request
Category	ControlLogix I/O Modules
Lifecycle	Discontinued
Warranty	12-month (new) · 3-month (used/refurbished)

Shipping & availability

Can I still buy the 1756-CNB now that it is discontinued?

Yes. Rockwell Automation / Allen-Bradley has discontinued the 1756-CNB, but sourcing discontinued parts is what PartnerPLC specialises in — new old stock, used and refurbished units. Request a quote and we'll confirm availability, condition and lead time.

When can 1756-CNB be shipped?

1756-CNB is sourced on request — request a quote and we'll confirm the exact availability and shipping timeline for this specific unit.

Can I pick up 1756-CNB in person?

Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.

Is express delivery available?

Yes — mention it when you request a quote for 1756-CNB and we'll include express shipping options in our reply.

My factory is down and I need this urgently — can you help?

For a critical breakdown, contact us directly at +31 (0)50-7110348 or sales@partnerplc.com — we can look into same-day courier or dedicated taxi/hotshot delivery for 1756-CNB, subject to availability and destination.

Allen-Bradley 1756-CNB — ControlLogix Communication Module. Discontinued by Rockwell Automation on December 31, 2024. PartnerPLC supplies new, surplus and discontinued Allen-Bradley parts — request a quote for price, condition and lead time.

Specifications

Product

Lifecycle	Discontinued
Discontinued date	December 31, 2024
Replacement category (Rockwell)	Engineering Replacement
Repair options available	Yes

Specifications

Communication	ControlNet
Interface	1 ControlNet BNC
Number Of Channels	1
Conducted RF immunity	10V rms with 1 kHz sine-wave 80% AM from 150 kHz...80 MHz
Connections supported, max	64 maximum
ControlNet cable	1786-RG6 quad shield RG6 coaxial cable
ControlNet port	1 ControlNet BNC
Current draw	970mA @ 5.1V DC, 1.7mA @ 24V DC
EFT/B immunity	±3kV @ 5kHz on ControlNet ports
Emissions	CISPR 11: Class A
Enclosure type rating	None (open-style)
ESD immunity	6 kV contact discharges, 8 kV air discharges
IO link master	false
Isolation voltage	Standard: 30V (continuous), basic insulation type, ControlNet network to, backplane, Redundant: 30V (continuous), basic insulation type, ControlNet A/B to, backplane, and ControlNet A to ControlNet B, USB to backplane and USB to ControlNet, No isolation b
Logix communication connections range	40...48
Module location	Chassis based, any slot
NAP cable	1786-CP
NAP port	1 NAP RJ45
Number of nodes, max	99 nodes
Operating temperature	0 to 60 °C
Power dissipation	5.1 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
Radio standard Bluetooth	false
Radio standard GPRS	false
Radio standard GSM	false
Radio standard UMTS	false
Radio standard Wi-Fi 802.11	false
Redundancy	false
Relative humidity	5...95% noncondensing
Shock	Operating: 30 G, Non operating: 50 G
Slot width	1
Storage temperature	-40 to 85 °C
Supporting protocol for ASI	false
Supporting protocol for AS-Interface Safety at Work	false
Supporting protocol for CAN	false
Supporting protocol for Data-Highway	false
Supporting protocol for DeviceNet	false
Supporting protocol for DeviceNet Safety	false
Supporting protocol for EtherNet/IP	false
Supporting protocol for Foundation Fieldbus	false
Supporting protocol for INTERBUS	false
Supporting protocol for INTERBUS-Safety	false
Supporting protocol for KNX	false
Supporting protocol for LON	false
Supporting protocol for Modbus	false
Supporting protocol for other bus systems	true
Supporting protocol for PROFIBUS	false
Supporting protocol for PROFINET CBA	false
Supporting protocol for PROFINET IO	false
Supporting protocol for PROFIsafe	false
Supporting protocol for SafetyBUS p	false
Supporting protocol for SERCOS	false
Supporting protocol for SUCONET	false
Supporting protocol for TCP/IP	false
Surge transient immunity	±2 kV line-earth (CM) on ControlNet ports
Surrounding air temperature, max	60 °C
Thermal dissipation	17.4 btu/h
Transmission rate	5000 kbps
Vibration	2 G @ 10...500 Hz
Weight, approx	0.26 kg
Wiring category	1 - on ControlNet ports, 3 - on NAP ports
With optical interface	false
With potential separation	false