The Allen-Bradley 1756-IH16ISOE is a high-performance digital isolated input module designed for the ControlLogix platform. This module features 16 individually isolated inputs with Sequence of Events (SOE) capability, providing precise timestamping for critical industrial processes. Engineered for 125V DC sink/source applications, it ensures reliable signal acquisition in demanding electrical environments.
Features
16 individually isolated input channels for enhanced noise immunity and system flexibility.
Integrated Sequence of Events (SOE) functionality for accurate event recording and diagnostics.
Supports a wide operating voltage range of 90-140V DC.
Optimized for low power dissipation, rated at 5.5 Watts at 60 degC.
Compatible with standard ControlLogix chassis backplanes.
Technical Specifications
Model
1756-IH16ISOE
Input Type
16 Individually Isolated, SOE
Input Voltage
125V DC Sink/Source
Operating Voltage Range
90-140V DC
Backplane Current (5V)
275 mA
Backplane Current (24V)
2 mA
Input Delay Time
75 microseconds + selected filter time
Off-State Current (Max)
0.3 mA
Operating Current (Min/Max)
1.15 mA at 90V / 1.85 mA at 140V
Installation Guidelines
Ensure the ControlLogix chassis is powered down before inserting or removing the module to prevent electrical damage.
Verify that the module is fully seated in the slot and the locking tab is engaged.
Use appropriate shielded cabling to minimize EMI interference in high-voltage DC environments.
Maintain adequate clearance within the cabinet to allow for proper airflow and cooling, adhering to the 60 degC maximum ambient temperature rating.
Follow local grounding practices for all I/O wiring to ensure signal integrity.
FAQ
What is the primary function of the SOE feature in this module? The Sequence of Events (SOE) capability allows the module to capture the exact timing of input transitions, which is essential for troubleshooting complex sequences and understanding the order of operations during system faults.
Is this module compatible with standard 24V DC signals? No, this module is specifically designed for 125V DC applications with an operating range of 90-140V DC. Using it with 24V DC signals will result in non-operation.
