Allen-Bradley 1756-IG16 ControlLogix 5V TTL Input
Introduction:
The Allen-Bradley 1756-IG16 is a 16-point TTL input module for ControlLogix. It operates at 5V DC with Low True logic. Ideal for high-speed counting.
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Allen-Bradley 1756-IG16 ControlLogix Digital DC Input Module
The 1756-IG16 is a specialized TTL input module for the ControlLogix platform. It accepts 16 digital signals at 5 Volts DC. This module uses a Low True (active-low) logic configuration. The 1756-IG16 works best for high-speed counting and position sensing.
Product Overview
Series: ControlLogix
Product Type: Digital DC Input Module
Classification: I/O Modules
Current Price (RMB): ¥3,850.00
Approx. Gross Weight: 0.35 kg
Technical Specifications
The 1756-IG16 operates within a voltage range of 4.5 to 5.5 Volts DC. Its nominal input current equals 3.7 mA at 5V DC. The maximum off-state current reaches 4.1 mA. This module dissipates 1.4 Watts at 60 degrees Celsius. Thermal dissipation maxes at 4.8 BTU/hour under full load.
Input Logic (Low True):
- Guaranteed ON state (True): -0.2 to 0.8 Volts DC.
- Undefined zone: 0.8 to 2.0 Volts DC.
- Guaranteed OFF state: 2.0 to 5.5 Volts DC.
Timing and Response:
- Total delay: 0.25 ms + selected filter time.
- Off-to-On hardware delay: 270 µs nominal, 450 µs max.
- On-to-Off hardware delay: 390 µs nominal, 700 µs max.
- User filter options: 0, 1, or 2 milliseconds.
Backplane and Power:
- Backplane current at 5V: 110 mA.
- Backplane current at 24V: 2 mA.
- Backplane power: 0.61 Watts.
Installation Guide
Follow these steps to install the 1756-IG16 correctly. First, insert the module into any free slot of a ControlLogix chassis. Second, attach either the 1756-TBNH or 1756-TBSH removable terminal block. Third, wire your 5V TTL source signals to the block. Fourth, set the user filter time in the module properties. Finally, ground the common connection properly for stable reading.
Always disconnect system power before handling the 1756-IG16. Verify that your input signal stays below 0.8V DC to register an ON state. Keep signal wires away from high-power AC lines to prevent noise.
Packing List
The package includes the following items for the 1756-IG16:
- One Allen-Bradley 1756-IG16 module.
- One front panel dust cover.
- One product information sheet.
Note: The RTB housing (1756-TBNH or 1756-TBSH) is sold separately.
Frequently Asked Questions
Q1: Can the 1756-IG16 accept 24V DC sensor signals?
A1: No. This module strictly needs 4.5-5.5V DC TTL signals. A 24V signal will permanently damage the 1756-IG16.
Q2: Why does my input show ON when my sensor outputs 5V?
A2: The 1756-IG16 uses Low True logic. Below 0.8V means ON. Above 2.0V means OFF. Your sensor needs an inverting buffer.
Q3: Which RTB works best for the 1756-IG16?
A3: Use the 1756-TBNH for cage clamp wiring. Use the 1756-TBSH for screw clamp wiring.
Q4: How fast can the 1756-IG16 detect a pulse?
A4: With a 0 ms filter, total nominal delay stays under 0.7 ms. This supports a maximum frequency near 700 Hz.
Q5: Does the 1756-IG16 support Change of State (COS) detection?
A5: Yes. Configure COS in the module properties to trigger an immediate backplane update.
Documentation and Compliance
The 1756-IG16 complies with IEC 61131-2 standards. It maintains high noise immunity for industrial environments. Download the full user manual from Rockwell Automation. Keep the original packaging for safe transport. This module supports firmware checks via RSLogix 5000.