1756-DHRIO

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-DHRIO

Type

Communication module

Application

Communication module

Used with

ControlLogix 1756 chassis

Communication rate

57.6 Kbps, 115.2 Kbps, 230.4 Kbps

Remote I/O communication

Remote I/O scanner only 32 logical rack connections per remote I/O channel 16 block transfer connections per remote I/O channel

Connections supported, max

32

Current draw @ 5.1V DC

850 mA

Current draw @ 24V DC

1.7 mA

Power dissipation

4.5 W

Thermal dissipation

15.4 BTU/hr

Isolation voltage

30V (continuous), basic insulation type, DHRIO A/B to backplane, and DHRIO A/programming port to DHRIO B, No isolation between DHRIO A and Programming port, Type tested at 877V DC for 60 s, Compliant and tested according to IEC/UL 61010-1

Slot width

1

Module location

Chassis-based, any slot

Chassis

1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17

Power supply, standard

1756-PA72/C, 1756-PA75/B, 1756-PB72/C, 1756-PB75/B, 1756-PC75/B, 1756-PH75/B

Power supply, redundant

1756-PA75R, 1756-PB75R, 1756-PSCA2

Ports

2, individually selectable for DH+ or remote I/O

Wire size

0.519 mm2 (20 AWG) Belden 9463 copper twinaxial

Wiring category

2 - on DHRIO ports 3 - on local programming port

North American temperature code

T4A

IEC temperature code

T4

Enclosure type rating

None (open-style)

Temperature, operating

0…60 °C (32…140 °F)

Temperature, storage

-40…+85 °C (-40…+185 °F)

Relative humidity

5…95% noncondensing

Vibration

2 g @ 10…500 Hz

Shock, operating

30 g

Shock, nonoperating

50 g

Technical documents (1)

• Rockwell Automation technical data 1756-TD003

Key features

• Two ports, individually selectable for DH+ or remote I/O
• Remote I/O scanner only, 32 logical rack connections per channel
• Communication rates of 57.6, 115.2 and 230.4 Kbps
• Single-slot module that fits any slot in the chassis
• Open-style enclosure with a 0 to 60 °C operating range

About the Allen-Bradley 1756-DHRIO

The Allen-Bradley 1756-DHRIO is the ControlLogix DH Plus/RIO Comms Module, and Rockwell Automation lists its lifecycle status as Discontinued. Rockwell technical data 1756-TD003 gives two ports, individually selectable for DH+ or remote I/O, with communication rates of 57.6, 115.2 and 230.4 Kbps. It supports a maximum of 32 connections and draws 850 mA at 5.1V DC and 1.7 mA at 24V DC. Power dissipation is 4.5 W, and the module is a one-slot, open-style unit rated for operation from 0 to 60 °C.

What is the 1756-DHRIO used for?

Fitted in any slot of a ControlLogix chassis, the module provides DH+ or remote I/O communication through its two ports. On remote I/O it works as a scanner only, with 32 logical rack connections and 16 block transfer connections per remote I/O channel. Rockwell lists the 1756-A4, 1756-A7, 1756-A10, 1756-A13 and 1756-A17 chassis for it.

Lifecycle and successor

Discontinued.

Before you order

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

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