Description:
The 1790D‑T16BV0 is a 16‑point universal 24V DC digital input base block from Allen‑Bradley’s CompactBlock LDX I/O family. Designed for DeviceNet networks, this DIN rail‑mounted module features sinking/sourcing‑universal inputs (accepting both PNP and NPN sensors), removable terminal blocks for easy wiring, and IP20 protection for control cabinet use. It serves as a cost‑effective distributed I/O node for collecting discrete signals from pushbuttons, limit switches, and proximity sensors.
Application Scenarios:
In an automotive assembly line’s tooling station, a 1790D‑T16BV0 module is mounted locally inside the station’s control cabinet. It connects 16 pneumatic cylinder position sensors (sourcing type) and limit switches directly to the DeviceNet network. The module’s universal input design allows the maintenance team to replace sensors with either PNP or NPN types without rewiring the terminal block. The module’s compact size saves space compared to traditional rack I/O, and its status LEDs enable quick troubleshooting of faulty sensors without accessing the main PLC.
Parameter:
| Main Parameters | Value / Description |
|---|---|
| Product Model | 1790D‑T16BV0 |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Family | CompactBlock LDX I/O (1790D Series) |
| I/O Type | 16‑Point Universal 24V DC Digital Input Base Block |
| Input Voltage | 9.6 – 28.8 V DC (24V DC Nominal) |
| Input Type | Universal (Sinking or Sourcing, NPN/PNP Compatible) |
| On‑State Current | 8 mA max per channel @ 28.8V DC |
| Input Impedance | 4.8 kΩ (Nominal) |
| Isolation | 1250V AC RMS (I/O to Logic), 50V DC (I/O to System) |
| Network Protocol | DeviceNet (Integrated Network Interface) |
| Node Addressing | Rotary DIP Switch (0–63) |
| Baud Rate | 125 / 250 / 500 kbps (Auto‑Detect) |
| Power Supply | 24V DC (11 – 28.8V DC Range) |
| Power Dissipation | ~1.2 W (Module) + ~3.68 W (Field I/O) |
| Operating Temperature | 0 °C to +55 °C (32 °F to 131 °F) |
| Connection | Removable Screw Terminal Block (M3) |
| Mounting | 35 mm DIN Rail |
| Enclosure Rating | IP20 (Indoor Cabinet) |
| Status Indicators | Module/Network Status (MS/NS), 16 Green Input LEDs |
| Dimensions (WxHxD) | Approx. 104 x 42 x 52 mm |
Technical Principles and Innovative Values:
- Innovation Point 1: Universal Input Circuitry for Sensor Agnosticism. Unlike traditional DC input modules that require hardware configuration for either sinking (NPN) or sourcing (PNP) sensors, the 1790D‑T16BV0 uses a universal input design. Its internal circuit automatically interprets the current flow direction, allowing it to accept any 24V DC discrete sensor without jumper changes or module replacement. This drastically reduces spare parts inventory and eliminates wiring errors during sensor swaps.
- Innovation Point 2: Integrated DeviceNet Interface with Zero‑Slot Architecture. The module eliminates the need for a separate communication adapter. The DeviceNet scanner interface is built directly into the base block, reducing the footprint and component count. The module supports Change‑of‑State (COS) and polled messaging, optimizing network bandwidth by only transmitting data when inputs change. The rotary DIP switch allows for quick node address setting without software tools.
- Innovation Point 3: High‑Density Removable Terminal Block Design. Despite its compact size, the module features a removable screw terminal block that can be pre‑wired on a bench and then snapped onto the module. This “soft wiring” approach speeds up installation and maintenance. The terminals are grouped into two 8‑point commons, providing flexibility in power distribution and allowing partial replacement of field devices without shutting down the entire module.
