The Allen-Bradley 1756-IV32 is a high-density ControlLogix digital input module providing 32 DC sourcing input points. It accepts a 10...30V DC operating range with a nominal 24V DC input level and divides the channels into two groups of 16 points. Its architecture is intended for discrete field signal acquisition in ControlLogix chassis-based systems.
32 INPUTS
24V DC NOMINAL
2 × 16 GROUPS
MODULE PROFILE
32
Discrete Input Points
Voltage
10...30V DC
Nominal
24V DC
Power
4.1W max.
Isolation
250V continuous
High-density discrete acquisition for ControlLogix applications.
SIGNAL ARCHITECTURE
1756-IV32 At A Glance
32
INPUT CHANNELS
10–30V
DC OPERATING RANGE
24V
NOMINAL INPUT
2 × 16
INPUT GROUPS
01
Electrical Profile
The module is designed for DC sourcing input circuits and supports a nominal 24V DC signal environment. The specified operating range is 10...30V DC.
Input type
DC sourcing
Off-state voltage max.
5V
Off-state current max.
1.5mA
02
Signal Timing
The module combines hardware response characteristics with selectable input filtering. This allows signal conditioning to be matched more closely to the field application's response requirements.
Off → On nominal
350μs
Off → On max.
1ms
On → Off nominal
540μs
On → Off max.
2ms
Selectable Filtering
Different filter values can be selected for rising and falling signal transitions.
Off → On
0 / 1 / 2 ms
On → Off
0 / 1 / 2 / 9 / 18 ms
FAMILY / APPLICATION RELATIONSHIP
How The 1756-IV32 Fits
FIELD SIDE
32 DC Inputs
Two groups of 16 discrete input points accept compatible sourcing DC field signals.
↝
CONTROLLOGIX
1756-IV32
High-density discrete input acquisition within the ControlLogix chassis architecture.
↝
CONTROL SIDE
Controller I/O
Discrete input states are presented through the ControlLogix I/O architecture for controller processing.
SELECTION POINT
1756-IV32 vs. 1756-IV16
Both belong to the ControlLogix DC sourcing-input family, while the channel count is the primary capacity difference.
Characteristic
1756-IV32
1756-IV16
Input points
32
16
Input category
DC sourcing
DC sourcing
Typical selection consideration
Higher point density
Lower point count
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Industrial parts
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Let's Discuss Your Requirement
1756-IV32 Inquiry
For faster quotation and order coordination, please provide the following details.
Please contact us within 7 days after receiving the items if any issue occurs. Returned items should remain in their original condition and include the specific reason for return; a return or replacement can be arranged after receipt. The buyer is responsible for shipping costs associated with the return.
PURCHASING CONSIDERATIONS
1756-IV32 FAQ
01 / SELECTION
Can 1756-IV32 be used directly with a 24V DC sourcing field circuit?
Yes, provided the field circuit is compatible with the module's sourcing-input architecture and its specified 10...30V DC operating range. A 24V DC nominal signal falls within that range. Wiring polarity and field-device output type should be verified before installation.
02 / CAPACITY
Why would a buyer select 1756-IV32 instead of 1756-IV16?
The key capacity difference is the number of input points: 1756-IV32 provides 32 while 1756-IV16 provides 16. Where the application needs more compatible DC sourcing inputs within the ControlLogix architecture, the higher point count can reduce the number of input modules required.
03 / REPLACEMENT
What should be checked before replacing an existing 1756-IV32?
Confirm the complete catalog number and series, input voltage requirements, sourcing polarity, terminal arrangement, application configuration and revision compatibility. Channel count alone is not sufficient because modules with similar point counts can have different electrical interfaces.
04 / RESPONSE
How should 1756-IV32 filtering be considered for fast field signals?
Filtering adds intentional signal delay. The Off-to-On filter can be selected at 0, 1 or 2 ms, while the On-to-Off filter can be 0, 1, 2, 9 or 18 ms. Applications requiring fast signal recognition should consider the selected filter together with the hardware response time.
05 / ISOLATION
Does 1756-IV32 provide isolation between input groups?
Yes. The 1756-IV32 provides 250V continuous isolation between its two groups of 16 inputs. This is group-level isolation rather than individual channel isolation, so field circuits should be evaluated according to their reference and grounding arrangement.
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