Description

The GE Fanuc IC670MDL642 is a high-density 125 VDC discrete input module designed for signal acquisition within the Field Control distributed I/O architecture. Functioning as a high-voltage field sensor interface, this module converts incoming 125 VDC discrete signals from plant field switches, relays, and field contactors into internal logic-level signals used by the station CPU or master interface unit.

Occupying a single slot position on a compatible Field Control I/O Terminal Block, the module houses 16 input points organized into two isolated groups. It provides a reliable input link between field-level control hardware and central processing equipment in industrial control stations. Internal logic power for module operation is supplied directly via the 6.5 VDC backplane bus generated by the Field Control Bus Interface Unit (BIU).

Features

• Features 16 discrete input channels arranged into two isolated groups of 8 points each.
• Interfaces nominal 125 VDC high-voltage field inputs to low-voltage system logic.
• Compatible with both positive (sinking) and negative (sourcing) field input signal configurations.
• Draws a maximum logic backplane current of 77 mA at 6.5 VDC.
• Integrates directly into Field Control I/O Terminal Blocks without disturbing station field wiring.
• Supports automatic station layout scanning and slot-by-slot system configuration.

Applications

• Contact status monitoring for high-voltage DC switchgear and circuit breakers.
• Interfacing utility-level station battery and DC control bus signals to automation controllers.
• Processing high-voltage limit switch and safety interlock field contacts.
• System-level discrete signal monitoring in power generation and substation control systems.

Technical Specifications

Connections / Interfaces

Installation Guidelines

1. Disconnect all 24 VDC station supply power and high-voltage 125 VDC field circuits prior to installing or removing hardware.
2. Confirm that the DIN rail (35mm x 7.5mm) is securely panel-mounted and properly connected to the central earth ground point.
3. Ensure the I/O Terminal Block is latched onto the DIN rail and interconnected with the station Bus Interface Unit (BIU) using the specified interconnect cable.
4. Verify the mechanical keying on the I/O Terminal Block to prevent placing an incorrect module type in the slot.
5. Align the module housing over the assigned terminal block slot and press firmly straight down until fully seated.
6. Tighten the module retaining screws to ensure proper mechanical mounting and electrical connection.
7. Complete field wiring according to 125 VDC system schematics, keeping high-voltage DC lines separated from low-voltage communications cables.

Configuration Guidelines

1. Apply 24 VDC system power to the station Bus Interface Unit to initialize backplane power.
2. Allow the BIU Autoconfiguration routine to scan the station bus, detect the module in its installed slot, and map default I/O references.
3. If manual assignment is required, connect a Hand-held Programmer (HHP) to the MONITOR port on the BIU.
4. Access Module Config to assign specific starting bit references in the system input table (%I).
5. Configure fault reporting parameters (Report Faults: YES/NO) and module default response states (Hold Last State or default to 0) as required by system control logic.
6. Verify that assigned module memory addresses fall within the defined station network I/O map.