The 1746-IG16 is a precision digital input module for the SLC 500 platform. It processes low-voltage TTL signals with high reliability. This module effectively bridges electronic devices and industrial controllers.
Product Summary
The Allen-Bradley 1746-IG16 is a SLC 500 Digital DC TTL Input Module with sixteen input channels. It operates within a voltage range of 4.5 to 5.5 Volts DC. This module offers fast signal delays and robust noise immunity for critical applications.
Product Procurement & Buyer Guide
Procurement managers need a module that matches specific signal types. The 1746-IG16 directly addresses TTL and BCD input requirements. This module uses a sourcing input configuration for 5V DC logic. It provides sixteen input points per fused common group. This design simplifies wiring for high-density digital signals. You must ensure your controller chassis has one free slot. The module occupies a single slot in any SLC 500 chassis. Do not install it in slot zero, which is reserved for the controller. This module requires a 5V DC backplane current of 140 milliamps. Check your system power budget before installation. The module dissipates only one watt total power. This low power consumption reduces heat in your enclosure. The 1746-IG16 offers electro-optical isolation rated at 1500 volts. This isolation protects your control logic from input transients. It also provides NEMA ICS 2-230 rated noise immunity. This feature ensures reliable operation in electrically noisy environments. The module withstands operational vibration of 2.5G at 57 to 200 Hz. It also survives operational shocks up to 30G. These ratings guarantee durability in demanding industrial settings. The operating temperature range spans zero to sixty degrees Celsius. The module also tolerates five to ninety-five percent non-condensing humidity. These specs make it suitable for many factory floor locations. The 1746-IG16 holds CSA and UL certifications. It also carries a Class I, Division 2 hazardous environment rating. This approval allows installation in specific hazardous locations. Always verify your area classification before purchase. The module uses a 1746-RT25B removable terminal block. This feature simplifies wiring and future module replacement. You can order the 1746-HT or 1746-HCA I/O connection cables separately. The 1746-RL42 octal kit is also available for specific wiring needs. This module is a direct replacement for existing SLC 500 TTL inputs. Its inverted logic function is a key operational characteristic. An input voltage between -0.2 and 0.8 VDC turns the input ON. A voltage between 2.0 and 5.5 VDC turns the input OFF. This inverse functionality is standard for TTL sourcing modules. Ensure your control program logic accounts for this behavior. The 1746-IG16 provides fast signal processing for high-speed applications. The ON state signal delay is only 0.25 milliseconds. The OFF state signal delay is 0.5 milliseconds. These fast response times suit precise control sequences. The overall point input current is 3.7 milliamps. The OFF-state current is 4.1 milliamps. These values help you calculate total system load accurately.
Step-by-Step User & Installation Guide
Proper installation ensures long-term reliability for the 1746-IG16. Begin by turning off all power to the SLC 500 chassis. Electrostatic discharge can damage the module components. Handle the module only by its ends, not the metallic surfaces. This prevents ESD damage during installation. Align the module with the chosen slot in the chassis. Push the module firmly into the card guides. Ensure it seats securely into the backplane connector. Tighten the top and bottom retaining screws to secure it. Do not overtighten these screws. Now you must plan your field wiring carefully. Limit signal wiring length to 15 meters or 50 feet per point. This prevents signal degradation and noise pickup. Use only low power DC wiring for all input connections. Do not run signal wiring in the same duct as communication cables. This separation prevents electrical interference. Connect your TTL sourcing devices to the input terminals. The module requires a 5V DC signal from your devices. Verify your device output voltage is within 4.5 to 5.5 VDC. The module accepts a 50 millivolt peak-to-peak ripple on the supply. Connect the common return wires to the appropriate fused common terminals. The module uses 16 points per fused common. Check the wiring diagram for your specific terminal block. Apply power to the chassis after completing all wiring. The module will begin operation immediately. It requires no additional software configuration for basic function. You can mix this module with other SLC 500 module types. Group similar module types together for easier troubleshooting. This practice also simplifies control wiring routing. The step response for this module is 100 milliseconds for input. The output step response is 2.5 milliseconds. Account for these delays in your system timing calculations. The module provides a minimum wattage of 0.7 watts. Each input point dissipates 0.02 watts. Monitor the total thermal load inside your enclosure. Ensure adequate ventilation to keep the ambient temperature below sixty degrees Celsius. Store spare modules between minus forty and eighty-five degrees Celsius. Follow these steps for a successful and reliable deployment.
Logistics & Standard Packaging Details
- One (1) Allen-Bradley 1746-IG16 SLC 500 TTL Input Module
- One (1) 1746-RT25B Removable Terminal Block
- One (1) Installation and wiring instruction sheet
- Express shipping is available via FedEx, UPS, and DHL.
