Application Scenarios
In a North American injection molding facility, a 720-ton UBE molding machine relied on an SLC 500 control system for sequence control, safety interlocks, and quality monitoring. The existing 1746-IV16 module in the machine’s control cabinet began exhibiting intermittent channel failures after nearly two decades of continuous operation. With the module discontinued by Rockwell Automation, the plant’s maintenance team faced a critical decision: replace the entire SLC 500 platform or source a compatible replacement. By obtaining a remanufactured 1746-IV16, the facility restored full 16-channel input capability within hours rather than weeks, avoiding the six-figure cost and production disruption of a complete control system migration. The module‘s removable terminal block design allowed electricians to swap the unit without disturbing existing field wiring, reducing the repair to a simple plug-in operation.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1746-IV16 |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | SLC 500 Discrete DC Input Module |
| Lifecycle Status | Discontinued December 31, 2021 |
| Number of Inputs | 16 |
| Points per Common | 16 |
| Voltage Category | 24 VDC Source |
| Operating Voltage Range | 10 to 30 VDC |
| Backplane Current (5V DC) | 85 mA |
| Backplane Current (24V DC) | 0 mA |
| Nominal Input Current | 8 mA at 24 VDC |
| Off-State Voltage (Max) | 5.0 VDC |
| Off-State Current (Max) | 1.0 mA |
| Signal Delay (Max) | On = 8 ms; Off = 8 ms |
| Power Dissipation | 3.6 W maximum |
| Isolation | Communication circuits: 500V DC; Backplane: 1500V AC |
| Operating Temperature | 0°C to +60°C |
| Wiring Configuration | Sourcing (for NPN-style field devices) |
| Terminal Block | Removable (RTB) |
| Status Indicators | 16 LED indicators (one per channel) |
