Brief Product Description

Allen‑Bradley 1746-NI16I is a single-slot 16-channel analog input module for Rockwell SLC 500 PLC system. It supports multi-range current and voltage analog signals, each channel can be independently configured via RSLogix 500 software. It adopts Sigma‑Delta A/D conversion, with programmable digital low-pass filter and open circuit detection function. Equipped with removable terminal block (1746-RT25G). This module can work in Class1 or Class3 mode according to SLC processor version. Rockwell officially discontinued this product on Sep 30,2024. Only tested surplus and refurbished units are available for legacy SLC500 system maintenance and spare replacement.

Core Product Functions

• 16-channel analog input module for SLC500 PLC chassis, occupies one slot (except slot0)
• Input signal: 4-20mA, 0-20mA, ±10VDC, 0~10VDC, 1~5VDC, per-channel independent configuration
• Sigma-Delta ADC, 16-bit resolution, programmable digital filter (6Hz~250Hz optional)
• Support Class1 / Class3 operation mode, Class3 for high-performance processors (5/02,5/03,5/04,5/05)
• Built-in open-circuit fault detection, module & channel diagnostic status
• Removable terminal block for convenient field wiring and module replacement
• Backplane isolation, isolation rating: 500V AC for 1 second
• Max power consumption: 2.425W from SLC chassis backplane
• Transmit converted analog raw data to SLC processor via backplane bus

Application Scenarios

• Legacy Rockwell SLC500 PLC analog signal acquisition cabinet
• Chemical, water treatment, power plant pressure, temperature, flow 4-20mA transmitter collection
• Packaging, metallurgy, material processing factory analog sensor signal monitoring
• Retrofit & spare replacement of old SLC500 automation control system
• Factory floor analog measuring signal collection for discrete and hybrid process control

FAQ (Frequently Asked Questions)

• Q: Analog reading abnormal or jump after installing 1746-NI16I?
  A: Verify channel range setting in RSLogix500, check field transmitter wiring, loop power supply, cable shielding, terminal block contact, filter parameter configuration.
• Q: What is difference between 1746-NI16I and 1746-NI16V?
  A: 1746-NI16I supports current/voltage mixed input; 1746-NI16V is voltage-only 16CH analog input module.
• Q: What PLC processor compatible with 1746-NI16I?
  A: SLC500 series: 1747-L501/L502/L503/L504/L505; old 5/01 only supports Class1 mode, limited function.
• Q: Is 1746-NI16I available for new automation projects?
  A: Rockwell EOL since Sep 30,2024, no brand new original production. Recommend migration to Compact 5000 series I/O. Surplus/refurbished units only for existing SLC500 maintenance.
• Q: Can hot swap?
  A: SLC chassis I/O module can be hot-swap, but field analog signal will be lost; risk assessment and safety lockout required before replacement.