Allen-Bradley 1746-IH16 SLC-500 DC Input Module 16-Ch 125V DC

SLC 16 Point Digital Input Module

The 1746-IH16 SLC 500 General Purpose 125V DC Input Module, is a current sinking digital input module by Allen-Bradley which comes with a Removable Terminal Block and can be installed on any free 1746 I/O chassis slot. It is an input module with 16 current sinking 125V DC inputs and 16 points per common. It operational voltage ranges between 90 and 146V DC with various numbers of points powered ON simultaneously at various corresponding voltages. Six inputs points are powered ON simultaneously at 146V DC, with 12 points at 146V DC, with 14 points at 132V DC, and with 16 points at 125V DC. It draws a backplane current of 0.085A at 5.0V DC and the input signal is delayed at 9ms for both the OFF and ON state. The 1746-IH16 has a maximum OFF state drop voltage of 20V DC and a current leakage of 0.8mA in its OFF state. It nominal input current per point is 2.15mA at 125V DC and 2.25mA at 132V DC and the module has an overall heat dissipation of 5.17W.

1. Process industrial parameter monitoring
The 1746-IH16 module is designed for industrial-grade signal acquisition and supports 16 analog inputs (±10V/0-20mA). It is widely used in chemical reactor temperature monitoring, water treatment pH value acquisition, boiler pressure transmitter signal reading and other scenarios. Its 0.1% measurement accuracy meets the ISO 9001 quality management system's requirements for recording key parameters.

2. Energy management system
In power distribution, new energy power stations and other scenarios, the module can simultaneously access multiple current/voltage transmitter signals (4-20mA), monitor transformer temperature, photovoltaic array output voltage and other parameters in real time, and cooperate with the SLC 500 controller to achieve load balancing control. In a wind farm project, 32 channels are used to achieve full-field wind turbine status acquisition.

3. Equipment health predictive maintenance
By connecting vibration sensors (±10V output), oil quality testers and other equipment, the 1746-IH16 can build an online monitoring system for mechanical equipment. A typical example is the bearing monitoring of a steel mill rolling mill. The module's 1500Vrms channel isolation effectively suppresses strong electromagnetic interference, and the raw data is processed by the PLC to generate an equipment health assessment report.

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