Allen-Bradley 1756-IB32

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-IB32

Type

Digital input module

Application

I/O module

Used with

ControlLogix 1756 chassis

Inputs

32 (16 points/group)

Voltage category

12/24V DC sink

Operating voltage range

10…31.2V DC

Input voltage, nom

24V DC

Input delay time (screw to backplane)

Hardware delay: 380 µs max + filter time, User-selectable filter time: 0 ms, 1 ms, or 2 ms, Hardware delay: 420 µs max + filter time, User-selectable filter time: 0 ms, 1 ms, 2 ms, 9 ms, or 18 ms

Current draw @ 5.1V

120 mA

Current draw @ 24V

2 mA

Total backplane power

0.66 W

Power dissipation, max

6.2 W @ 60 °C (140 °F)

Thermal dissipation

21.1 BTU/hr @ 60 °C (140 °F)

Off-state voltage, max

5V

Off-state current, max

2.27 mA

On-state current, min

4.8 mA @ 10V DC

On-state current, max

5.5 mA @ 31.2V DC

Inrush current, max

250 mA (decaying to < 37% in 22 ms, without activation)

Cyclic update time

200 µs…750 ms

Change of state

Software configurable

Time stamp of inputs

±200 µs

Isolation voltage

250V (continuous), reinforced insulation type, inputs-to-backplane 250V (continuous), basic insulation type, input group-to-group, No isolation between individual group inputs

Module keying

Electronic, software configurable

RTB keying

User-defined mechanical

Slot width

1

Wire category

1 - on signal ports

Terminal block torque specs

1756-TBCH, 1756-TBCHXT 0.5 Nm (4.4 lbin)

Enclosure type

None (open-style)

Technical documents (1)

• Rockwell Automation technical data 1756-TD002

Key features

• 32 inputs arranged in groups of 16 points
• Software configurable change of state and electronic keying
• Inputs time stamped to within ±200 µs
• Reverse polarity protection
• Operates from 0 to 60 °C, open-style enclosure

About the Allen-Bradley 1756-IB32

The 1756-IB32 is a ControlLogix 32 point 12/24V DC input module (10-31 VDC Input 32 Pts, 36 pin). Its 32 sinking inputs sit in groups of 16, with a nominal input of 24V DC and an operating range of 10 to 31.2V DC. It draws 120 mA at 5.1V and 2 mA at 24V, dissipates up to 6.2 W at 60 °C, and occupies 1 slot.

What is the 1756-IB32 used for?

It brings 32 DC signals from field devices onto the ControlLogix backplane, a dense choice where slots are short. The cyclic update time is 200 µs to 750 ms, and change of state can be set in software. Inputs are isolated from the backplane at 250V continuous, reinforced insulation.

Lifecycle and successor

Active (Rockwell Automation lifecycle status, checked 24 October 2026).

Before you order

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

Read the catalog number 1756-IB32, the series letter and the firmware revision from the label. Send us a photo of the label and we confirm the match before we quote.