Year: 2025

The IC670MDL331 is a field control I/O module manufactured by GE Fanuc. The module is a discrete output module with eight (8) channels in four (4) groups of two (2) channels each. It provides an output voltage range of 85-132 VAC, a nominal output of 120 VAC, and a maximum output current of 2 A per channel.The module has a backplane current consumption of 154 mA.

About the IC670MDL331

This IC670MDL331 is manufactured by GE Fanuc and is part of the Field Control family. It is an I/O module, specifically, a discrete output module with eight (8) output channels divided into four (4) with two (2) channels each. It provides an output voltage of 85-132 VAC, 47-63 Hz, and a nominal output level of 120 VAC.Each channel of the module is designed to provide a maximum output current of 2 amps, making the module compatible with inductive loads.

Although the IC670MDL331 is rated for 2 A per channel, the maximum output per group is limited to a maximum of 2 A. Additionally, the maximum output per module is limited to 6A – 8 A. The module is equipped with LED status indicators, such as Logic Side Indicators, describing the on and off status of each channel, and Fuse OK LEDs, indicating the status of the fuses mounted inside each channel group. status of the fuses installed inside each channel group.

The IC670MDL331 is used in conjunction with a Bus Interface Unit (BIU). This BIU sends individual channel status to a host controller that resides on a protocol supported by the BIU. In addition, the controller can access the diagnostic status of the IC670MDL331 through the BIU.

Module Operation

A network of resistors and capacitors establishes input thresholds and provides input filtering.

Optoisolators provide isolation between the field inputs and the module’s logic components.

Data from all 16 inputs is placed into a data buffer. The module’s circuit LEDs show the

current states of the 16 inputs in this data buffer.

Parallel–to–seri al converters change input data from the data buffer into the serial format

needed by the Bus Interface Unit.

After checking the Board ID and verifying that the module is receiving appropriate logic power

from the Bus Interface Unit (which is reflected by the state of the module’s Power LED), the Bus

Interface Module then reads the filtered, converted input data.

Positive or Negative Inputs

Inputs for this module can be either positive or negative inputs (all 16 inputs must be the same

type). Both types of signal produce a logic 1 (true) when the switch is closed. Selection of

positive or negative operation is made by the manner in which the external power supply is

connected to the inputs and to the I/O Terminal Block.

Positive inputs receive current from input devices and supply current to the common or negative

power bus. Input devices are connected between the positive power bus and the input terminals.

Negative inputs provide current to input devices and accept current from the common or

positive power bus. Input devices are connected between the negative power bus and the input

terminal.

The 24 VDC Positive/Negative Input Module (IC670MDL640) provides a single group of 16 discrete inputs, which may be driven by positive or negative logic.

Power Sources

The module receives power from the Field Processor to run its own 5–volt logic. An external

24VDC supply is needed to power the input devices.

LEDs

Individual LEDs (logic side), visible through the transparent portion of the module top,

indicate the on/off status of each input. The PWR LED is on when field and backplane power

are present.

Host Interface

Intelligent processing for this module is performed by the Bus Interface Unit or elsewhere in

the system. This includes configuring features such as input defaults and fault reporting. The

module has 16 bits (two bytes) of discrete input data. A Bus Interface Unit is required to

provide this input data to the host and/or local processor.

Wiring Examples with Auxiliary Terminal Blocks

If the module is installed on an I/O Terminal Block with Box Terminals or an I/O Terminal

Block with Barrier Terminals, an Auxiliary Terminal Block may be required to provide

additional wiring terminals. For the I/O Terminal Block with Wire to Board Connectors,

external connection points are usually be preferred, although an Auxiliary Terminal Block

can be used..

Auxiliary Terminal Blocks have all terminals connected together internally. The Auxiliary

Terminal Block with box terminals has 13 terminals, each of which accommodates one AWG

# 14 (avg 2.1mm2 cross section) to AWG #22 (avg 0.36mm2 cross section) wire, or two wires up

to AWG #18 (avg. 0.86mm2 cross section). The Auxiliary Terminal Block with barrier terminals

has nine terminals, each of which can accommodate one or two wires up to AWG #14 (avg

2.1mm2 cross section).

Connection to the A terminals is optional. They can be used as shown on the next page.

The Terminal Block with box terminals has 25 terminals for each module, each of which

accommodates one AWG #14 (avg 2.1mm2 cross section) to AWG #22 (avg 0.36mm2 cross

section) wire, or two wires up to AWG #18 (avg. 0.86mm2 cross section). When an external

jumper is used, the wire capacity is reduced from AWG #14 (2.10mm2) to AWG #16

(1.32mm2).

The I/O Terminal Block with barrier terminals has 18 terminals per module. Each terminal

can accommodate one or two wires up to AWG #14 (avg 2.1mm2 cross section).

The I/O Terminal Block with Connectors has one 20-pin male connector per module. The

mating connector is Amp part number 178289–8. Any tin-plated contact in the AMP D–3000

series can be used with the connector (Amp part number 1–175217–5 for high contact force

receptacle for 20–24 gauge (0.20–0.56mm2) wires), 1–175218–5 for high contact force

receptacle for 16–20 gauge (0.56–1.42mm2)).

Positive or Negative Inputs

Inputs for this module can be either positive or negative (all 16 inputs must be the same type).

Both types of signal produce a logic 1 (true) when the switch is closed. Selection of positive or

negative operation is made by the manner in which the external power supply is connected to

the inputs and to the I/O Terminal Block.

Positive inputs receive current from input devices and supply current to the common or

negative power bus. Input devices are connected between the positive power bus and the input

terminals.

Negative inputs provide current to input devices and accept current from the common or

positive power bus. Input devices are connected between the negative power bus and the input

terminal.

 Field Wiring

The following illustration shows terminal assignments for the 48 VDC Positive/Negative

Input Module.

Module Operation

A network of resistors, capacitors, and zener diodes establishes input thresholds and provides

input filtering. Optoisolators provide isolation between the field inputs and the module’s logic

components. An oscillator and switch form a sampling circuit that is transparent to the

controller and the LEDs that indicate the state of the inputs. Data from all 16 inputs is placed

into a data buffer. The module’s circuit LEDs show the current states of the 16 inputs in this

data buffer.

Parallel-to-serial converters change input data from the data buffer into the serial format

needed by the Bus Interface Unit.

After checking the Board ID and verifying that the module is receiving appropriate logic power

from the Bus Interface Unit (which is reflected by the state of the module’s Power LED), the Bus

Interface Module then reads the filtered, converted input data.

The 48 VDC Positive/Negative Input Module (IC670MDL641) provides a single group of 16 discrete inputs, which may be driven by positive or negative logic.

Power Sources

The module receives power from the Bus Interface Unit for its own operation. An external 48

VDC supply is needed to power the input devices.

LEDs

Individual LEDs (logic side), visible through the transparent portion of the module top,

indicate the On/Off status of each input. The PWR LED is On when field and backplane

power are present.

Host Interface

Intelligent processing for this module is performed by the Bus Interface Unit or elsewhere in

the system. This includes configuring features such as input defaults and fault reporting.

The module has 16 bits (two bytes) of discrete input data. A Bus Interface Unit is required

to provide this input data to the host and/or local processor.

This IC670MDL740 is a positive logic discrete output module manufactured by GE Fanuc. The module is a general-purpose output module that is mounted on a Bus Interface Unit (BIU) to implement an extended I/O solution. It is typically used for energised output devices such as indicator lights, relay coils, solenoid driven devices and similar devices with low current ratings because the IC670MDL740 provides 10.30 amps of output current per channel and a total of 24 amps of output current per module over a voltage output range of 0-5 VDC and a nominal voltage of 4 VDC.

The IC670MDL740 is designed with individual status LEDs to indicate the on/off status of each output channel of the module. 

The entire I/O group is fitted with a common fuse that is also assigned an LED to describe the blown fuse status. The module generates an inrush current rated at 2 amps with a maximum duration of 100 ms. The output channels have a minimum load current of 1 mA per point, an output voltage drop of 0.5 V, an output leakage current of 5.30 mA at 0 VDC, and a typical response time for on and off signal transitions.

The IC670MDL740 comes with an integrated terminal block consisting of 25 terminals. Each terminal is designed to terminate one AWG #14 – AWG #22 wire or two (18) wires using AWG #2 wire. By installing external jumpers on this module, the allowable wire size is reduced to AWG #14 to AWG #16.

The Field Control IC670MDL742 DC Output Module is a negative logic output module for GE Fanuc.

It has user input voltages of 4.75 to 5.25 volts DC and 10.5 to 28.5 volts DC, 4.5 to 28.25 volts DC outputs, and 16 negative logic discrete outputs.

About the IC670MDL742

The Field Control IC670MDL742 DC Negative Output Module is a GE Fanuc 5-, 12-, and 24-volt DC rated output module with 16 negative logic discrete outputs.

The outputs are used as current-sucking outputs to switch the load to the negative side of the DC power supply.Power for the IC670MDL742 DC Negative Output Module is provided by the bus interface module.

It is recommended that an external DC power module be used to provide the power required by the load. The module contains a 10 ampere rated fuse for connection to an external power source.

There is a clear potion on the top of the module for clearly visible LED indicators.

The IC670MDL742 DC Negative Output Module performs processing through the bus interface unit.

The bus interface module also helps to collect output data from a host device or processor.

Its PWR indicator LED can be used to check that the module’s backplane power is present and that the fuse is not blown.