Allen-Bradley 1756-IA16I ControlLogix 16-Point Isolated AC Digital Input Module
16 Individually Isolated Input Channels
120V AC Nominal Input
1756-IA16I datasheet
Place of Origin:
USA
Brand Name:
Allen-Bradley
16 Individually Isolated Input Channels
,120V AC Nominal Input
,1756-IA16I datasheet
Allen-Bradley 1756-IA16I
ControlLogix Isolated AC Digital Input Module
01 / OVERVIEW Product Overview
The Allen-Bradley 1756-IA16I is an AC digital input module for ControlLogix automation systems. It receives field input signals and makes their status available to the controller for monitoring and control operations.
It is intended for applications that require individually isolated input circuits. Typical uses include monitoring machine states, control contacts and discrete AC field conditions.
02 / ELECTRICAL DATA Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Catalog Number | 1756-IA16I |
| Product Family | ControlLogix |
| Module Type | Isolated AC Digital Input |
| Operating Voltage | 79–132V AC |
| Operating Frequency | 47–63 Hz |
| Isolation Voltage | 125V continuous, basic insulation, input-to-backplane and input-to-input |
| Input Timestamp | ±200 μs |
Additional Electrical, Timing and Installation Specifications
| Input Delay, OFF to ON | 10 ms maximum hardware delay, plus filter time; selectable 1 ms or 2 ms filter |
| Input Delay, ON to OFF | 8 ms maximum hardware delay, plus filter time; selectable 9 ms or 18 ms filter |
| Current Draw at 5.1V | 125 mA |
| Current Draw at 24V | 3 mA |
| Total Backplane Power | 0.71 W |
| Thermal Dissipation | 16.71 BTU/hr |
| Input Change of State | Software configurable |
| Module Keying | Electronic, software configurable |
| Slot Width | 1 slot |
| Maximum Off-State Current | 2.5 mA |
| Minimum On-State Current | 5 mA at 79V AC, 47–63 Hz |
| Maximum On-State Current | 15 mA at 132V AC, 47–63 Hz |
| Maximum Inrush Current | 250 mA |
| Maximum Input Impedance | 8.8 kΩ at 132V AC, 60 Hz |
| Cyclic Update Time | 200 μs–750 ms |
| Removable Terminal Block Housing | 1756-TBCH / 1756-TBS6H |
| RTB Keying | User-defined mechanical |
| Wire Category | Category 1 on signal ports |
| Enclosure Type | Open-style |
Terminal block housing is specified separately from the module. Confirm the installed terminal block and wiring arrangement before ordering.
03 / FIELD APPLICATION Application & Failure Scenarios
The 1756-IA16I is used in ControlLogix automation systems that monitor AC field signals, such as machine operating states, control contacts and other discrete input conditions.
A field signal is present but the corresponding controller input status does not change as expected. The input circuit, terminal connections and module channel may need inspection.
Unstable or inconsistent input indication can affect sequence logic, interlocks and machine operating decisions.
Suspected input module failure may interrupt multiple field status signals and affect the availability of the associated ControlLogix control process.
Before replacement, verify the field AC supply, wiring, terminal block condition, channel configuration and controller diagnostics. A missing input indication does not by itself establish module failure.
04 / ORDER VERIFICATION Identification Before Ordering
When sourcing a replacement, confirm the complete catalog number on the existing module label. In particular, distinguish the isolated 1756-IA16I from the 1756-IA16, which has a different input connection arrangement.
Also verify the installed removable terminal block housing, chassis slot allocation and existing system configuration before installation.
05 / SUPPLY SUPPORT Delivery & Warranty
Please provide Part Number, Quantity, Destination, Required Date and Machine/System Model when requesting a quotation.
Global Industrial Parts Sourcing
06 / SUPPORT Frequently Asked Questions
Its specified operating voltage range is 79–132V AC at 47–63 Hz, with a nominal input voltage of 120V AC.
It provides 16 individually isolated AC digital input channels.
No. The 1756-IA16I has individually isolated inputs and a 36-pin connection, while the 1756-IA16 is a different module with a 20-pin connection.
The specified removable terminal block housings are 1756-TBCH and 1756-TBS6H. Confirm the installed terminal block configuration before ordering.
Verify the catalog number, field input voltage, wiring, terminal block housing, channel configuration and controller diagnostics before installing a replacement.
1756-IA16I datasheet
Technical information covers input ratings, channel isolation, electrical characteristics, timing and terminal block compatibility.
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