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Product Overview
The Allen-Bradley 1790D-T16BV0 is a 16-point, 24V DC digital input base module belonging to Rockwell Automation’s CompactBlock® LDX distributed I/O product family. Designed to be used in conjunction with a compatible CompactBlock LDX communication adapter (such as the EtherNet/IP or DeviceNet adapter heads), the Allen-Bradley 1790D-T16BV0 provides sixteen sinking/sourcing (universal) 24V DC discrete input channels organized into two electrically isolated groups of eight. Each input point senses the presence of a 24V DC signal from field devices such as proximity sensors, limit switches, pushbuttons, or dry-contact closures, and reports the status to the controlling PLC or PAC via the attached LDX adapter over the chosen industrial network.The Allen-Bradley 1790D-T16BV0 is housed in a compact, IP20-rated enclosure suitable for DIN-rail or panel mounting inside a control cabinet. It features a removable screw-terminal block (RTB) for straightforward field wiring and a bus connector on the rear that mates directly with the LDX adapter or can be daisy-chained with additional LDX I/O bases. Input filtering provides a typical response time of approximately 2 ms (ON/OFF delay selectable in some configurations via adapter settings), which is well suited to general-purpose machine and process discrete sensing. Each of the sixteen channels has a dedicated green LED that illuminates when the input is logically ON, giving technicians immediate visual confirmation of sensor status without accessing the programming software.As part of the CompactBlock LDX system, the Allen-Bradley 1790D-T16BV0 draws its 5V backplane logic power from the communication adapter and requires only the 24V DC field power to be wired to the module’s input commons. This simplifies panel wiring and reduces the number of separate power supplies needed in small to mid-sized distributed I/O applications. The module is auto-discovered by RSLogix / Studio 5000 when used with an EtherNet/IP adapter, and by RSNetWorx for DeviceNet when used on a DeviceNet adapter, making configuration quick and intuitive for system integrators already familiar with Rockwell’s I/O architecture.
Technical Specifications
| Product Model | 1790D-T16BV0 |
|---|---|
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Product Type | CompactBlock LDX 16-Point 24V DC Digital Input Base Module |
| Series | CompactBlock LDX (1790 Series) |
| Number of Inputs | 16 (2 groups × 8 points); sinking or sourcing (universal) per group |
| Nominal Input Voltage | 24V DC (Operating Range 10–30V DC typical; 9.6–28.8V DC per spec) |
| Input Type | DC Type 1, compliant with IEC 61131-2 |
| ON-state Voltage | ≥ 11V DC (typical threshold) |
| OFF-state Voltage | ≤ 5V DC (typical) |
| Input Current (per point @ 24V) | Typ. 4–6 mA |
| Input Delay (Filter Time) | 1 ms / 2 ms / 4 ms / 8 ms selectable via adapter properties (default ~2 ms) |
| Isolation – Input Group to Logic | 500V AC for 1 min (functional) |
| Isolation – Between Groups | None (common per 8-pt group) |
| Field Power Requirement | 24V DC field power must be supplied to each group’s common terminal |
| Logic Power | Derived from LDX communication adapter via bus connector (5V DC) |
| Terminal Type | Removable screw terminal block (RTB); accepts 22–14 AWG |
| Mounting | 35 mm DIN Rail (EN 60715) or panel mount with screws |
| Dimensions (H × W × D) | Approx. 110 mm × 40 mm × 75 mm (4.33″ × 1.57″ × 2.95″) |
| Operating Temperature | 0 °C to +60 °C (+32 °F to +140 °F) |
| Ingress Protection | IP20 (when installed in cabinet) |
| Certifications | UL Listed, CSA Certified, CE Marked, C-Tick, FM Cl. I Div. 2 |
Main Features and Advantages
Universal sink/source input circuitry:The Allen-Bradley 1790D-T16BV0 employs a universal DC input circuit on each channel, meaning the same module can be wired to either NPN (sinking) sensors—where the sensor switches the negative leg—or PNP (sourcing) sensors—where the sensor switches the positive leg—simply by how the 24V DC common is connected to the group’s COM terminal. This eliminates the need to stock separate sinking-only or sourcing-only input cards and provides flexibility when integrating mixed-vendor sensors on a single machine.
