Honeywell 621-0071 Logic Manager Module

The Honeywell 621-0071 Logic Manager Module is a programmable logic control module used in Honeywell Logic Manager and TDC 3000 environments. It executes user-developed ladder logic, manages distributed I/O communications, and provides control processing for discrete and process applications within the IPC 620 platform.

Control and Processing Functions

The module executes ladder logic programs and processes discrete control strategies in real time. It serves as the primary logic processor within a Logic Manager system, handling I/O scanning, control execution, diagnostics, and communication with supervisory systems.

Typical digital control response is approximately 50 ms from input state change to output action.

I/O and System Capacity

The 621-0071 supports both parallel and serial I/O architectures.

• Up to 2048 parallel I/O points

• Up to 2040 serial I/O points

• Up to 254 analog channels at a 1 s scan period

• Up to 127 analog channels at a 0.5 s scan period

Communications

The module communicates through the Universal Control Network (UCN) used in Honeywell distributed control systems.

Key communication features include:

• UCN network support

• 5 Mbit/s UCN communication rate

• RS-422 and RS-485 communication capability

• Integration with Logic Manager and TDC 3000 systems

Power and Protection

The module operates from a 24 VDC supply and typically draws 300 mA during operation.

An internal fuse is provided for module protection against abnormal fault conditions.

Technical Specifications

Installation Notes

The module is designed for installation in a compatible Honeywell Logic Manager rack. Power and communication services are provided through the system architecture, while field I/O is accessed through connected serial or parallel I/O subsystems.

Frequently Asked Questions

Q: What is the primary function of the 621-0071?

A: The module executes user-configured ladder logic and manages I/O processing and communications within a Honeywell Logic Manager control system.

Q: Does the 621-0071 support distributed I/O?

A: Yes. The module supports both serial and parallel I/O architectures, with capacities of up to 2040 serial points or 2048 parallel points.

Q: Can the module communicate with TDC 3000 systems?

A: Yes. The 621-0071 supports UCN communications and is designed for integration with Honeywell Logic Manager and TDC 3000 environments.