1790D-T16BV0 Allen-Bradley Input Base Block

1790D-T16BV0 CompactBlock LDX Universal Input Base Block

Product Introduction

The 1790D-T16BV0 module belongs to the Allen‑Bradley Bulletin 1790D CompactBlock LDX family. This input base block provides 16 universal input channels for 24V DC signals. Each channel supports both sinking and sourcing field devices, offering great wiring flexibility. Furthermore, the module includes a built‑in DeviceNet interface for direct network connection. Sixteen green LED indicators show the status of every input point. Designed for industrial environments, the 1790D-T16BV0 operates reliably across a wide temperature range and withstands shock and vibration.

Technical Specifications

Input Characteristics
The 1790D-T16BV0 delivers 16 non‑isolated input points. These inputs are universal and work with sinking or sourcing configurations.

• Number of inputs: 16 points

• On‑state voltage: 9.6V DC (min) / 24V DC (nom) / 28.8V DC (max)

• Off‑state voltage: 5.0V DC max

• On‑state current: 8 mA max per channel at 28.8V DC

• Off‑state current: 1.5 mA at 5V DC

• Input impedance (nominal): 4.8 kiloohms

• Common type: 8 points share 8COM (non‑polarity)

• Indicators: 16 green LEDs for input status

Power and Isolation

• DeviceNet supply voltage: 24V DC nominal (range 11…28.8V DC)

• DeviceNet power dissipation: 1.2 W max at 28.8V DC

• Isolation (I/O to logic): Photocoupler isolation, 1250V AC RMS

• DeviceNet to logic: Non‑isolated

• DeviceNet power: Non‑isolated

Mechanical & Environmental Ratings

• Wiring: Terminal block with M3.0 screws (torque: 7 lb‑in max, use copper or copper‑clad aluminum conductors)

• Operating temperature: 0…60 °C (32…140 °F)

• Storage temperature: -40…85 °C (-40…185 °F)

• Operating shock: 30 g peak

• Vibration: 5 g at 10…500 Hz

• Humidity: 5…90% non‑condensing

• Weight: 1.36 kg (3.00 lbs)

Installation and Wiring Guidelines

First, mount the 1790D-T16BV0 onto a standard DIN rail inside a suitable enclosure. Ensure adequate airflow around the module. Next, connect the 24V DC DeviceNet power supply to the designated terminals. Then, wire your field input devices to the 16 input channels. Because the inputs are non‑polarity, you can connect both sinking (NPN) and sourcing (PNP) sensors without changing jumpers.

After that, attach the DeviceNet cable to the integrated connector. Tighten all M3.0 terminal screws to 7 lb‑in maximum. Finally, power up the system and verify that the green LEDs light up when inputs are active. For best results, avoid running input wires alongside high‑power cables.

Packaging List

• 1 x 1790D-T16BV0 input base block

• 1 x terminal block (pre‑attached)

• 1 x quick start guide (printed)

Shipping

We ship worldwide via FedEx, UPS, or DHL. Tracking number provided after dispatch.

Frequently Asked Questions (FAQ)

1. Can I use the 1790D-T16BV0 with both NPN and PNP sensors at the same time?
Yes. The inputs on the 1790D-T16BV0 are universal and non‑polarity. You can mix sinking and sourcing field devices across the 16 channels without any configuration changes.

2. What is the maximum current per input channel?
Each input channel draws a maximum of 8 mA at 28.8V DC. The 1790D-T16BV0 will not be damaged by higher currents, but the on‑state current is internally limited to this value.

3. Does this module require an external 24V supply for field inputs?
No. The 1790D-T16BV0 draws its input power from the field devices themselves. However, you still need a separate 24V DC supply for DeviceNet communication (11…28.8V DC).

4. How do I know if an input is active?
Each of the 16 input points has a dedicated green LED. When the input voltage exceeds 9.6V DC, the corresponding LED turns on. If the LED stays off, check your field wiring or sensor power.

5. Is the 1790D-T16BV0 compatible with other DeviceNet scanners?
Absolutely. It follows standard DeviceNet protocol and works with any DeviceNet master, including Allen‑Bradley 1756‑DNB, 1770‑KFD, or third‑party scanners.