6186M-15PT A-B Digital Input Module

6186M-15PT      Allen-Bradley       Processor modules, programmable controllers

Allen-Bradley 1790D-T8BV8B CompactBlock LDX I/O Module: Detailed Description

The Allen-Bradley 1790D-T8BV8B is a CompactBlock LDX I/O module. These modules are designed for distributed I/O applications, typically used with DeviceNet networks. It offers a combination of digital inputs and outputs in a compact, block-style package.

Product Parameters/Specifications:

• I/O Configuration: 8 digital sinking/sourcing inputs and 8 digital sourcing outputs.

• Input Voltage: 24V DC.

• Input Type: Sinking or sourcing (user configurable per input point).

• Output Voltage: 24V DC.

• Output Current: 0.5 A (500 mA) per output.

• Communication Interface: DeviceNet.

• Connector Type: Open-style connectors for field wiring.

• Enclosure Rating: IP20 (finger-safe).

• Power Supply: Requires an external 24V DC power supply.

• Mounting: Designed for direct mounting to a panel or machine frame.

Product Advantages (When it was actively sold):

• Compact Size: The block design allows for high-density I/O in a small footprint.

• Distributed I/O: Suitable for applications where I/O needs to be located remotely from the controller.

• DeviceNet Connectivity: Integrates seamlessly into DeviceNet networks.

• Configurable Inputs: The ability to configure inputs as either sinking or sourcing provides flexibility in wiring.

• Simplified Wiring: Open-style connectors simplify field wiring.

Disadvantages (Now):

• Obsolete: The 1790D family, including the 1790D-T8BV8B, is obsolete. This means:

• Limited availability (primarily on the used/surplus market).

• No new production from Rockwell Automation.

• Lack of official support and updates.

• Potential difficulty integrating with newer control systems.

Static Sequence Control and General-Purpose Drive Controller Modules (in the context of the 1790D-T8BV8B):

The 1790D-T8BV8B is an I/O module and does not perform static sequence control or act as a drive controller. It facilitates communication between the PLC and field devices.

• Static Sequence Control: A PLC (e.g., a PLC-5, SLC 500, or a CompactLogix controller connected via a DeviceNet scanner) executes the static sequence control logic. The 1790D-T8BV8B acts as the remote I/O interface. The PLC program sends output commands through the DeviceNet network to the 1790D-T8BV8B to control actuators. It also receives input status from sensors connected to the 1790D-T8BV8B.

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