IC694MDL930 Isolated Relay Output Module: Versatile and Reliable 4 Amp Solution

The IC694MDL930 is a 4 Amp isolated relay output module that provides eight normally-open relay circuits, each capable of controlling output loads such as motor starters, solenoids, and indicators. Each relay circuit is isolated from the others, and each output point has its own separate common power terminal. With a switching capacity of 4 Amps per output, this module is versatile and suitable for a wide range of applications. Power to operate the field devices connected to this module must be supplied by the user.

The module is equipped with individual numbered LEDs that indicate the ON/OFF status of each output point. No fuses are present on the module, and the red bands on the label signify that the MDL930 is a high-voltage module. This module can be installed in any I/O slot within an RX3i system.

Technical Specifications

    Rated Voltage: 24 volts DC, 120/240 volts AC (nominal, with some exceptions listed below)
    Operating Voltage: 5 to 30 volts DC, 5 to 250 volts AC, 50/60 Hz
    Outputs per Module: 8 isolated outputs
    Isolation:
        250 VAC continuous (Field to Backplane and Frame Ground)
        1500 VAC for 1 minute (Field to Backplane and Frame Ground)
        250 VAC continuous (Point to Point); 1500 VAC for 1 minute

Maximum Load:
        4 Amps resistive per output
        2 Amps pilot duty per output
        20 Amps maximum per module for UL installations
    Minimum Load: 10 mA
    Maximum Inrush Current: 5 Amps
    On/Off Response Time: Maximum 15 ms for both ON and OFF
    Power Consumption:
        6 mA (all outputs ON) from the 5V bus on the backplane
        70 mA (all outputs ON) from the relay 24V bus on the backplane

Load Current vs. Temperature

The maximum load current capacity is affected by the ambient temperature. For example:

    32 Amps total load at 10°C
    24 Amps total load at 40°C
    16 Amps total load at 55°C

Load Current Limitations

The relay outputs can handle different load types and have varying lifespans depending on the type of load. Below are the typical contact life values for different load conditions:

    24 to 120 VAC, 4 Amps resistive: 150,000 operations
    240 VAC, 4 Amps resistive: 50,000 operations

Suppression Circuits for Inductive Loads

When switching inductive loads, relay contact life can be extended using suppression circuits. For DC loads, a diode (such as the 1A, 200V 1N4935) can be used, and for AC loads, a combination of a resistor and capacitor (e.g., 100 Ohms, 600V) can be used to suppress voltage spikes.

Field Wiring for IC694MDL930

The terminal connections for the IC694MDL930 module are as follows:

    Terminals 1, 10, 11, 20: No connection
    Terminals 2-3: Output 1 (normally open)
    Terminals 4-5: Output 2 (normally open)
    Terminals 6-7: Output 3 (normally open)
    Terminals 8-9: Output 4 (normally open)
    Terminals 12-13: Output 5 (normally open)
    Terminals 14-15: Output 6 (normally open)
    Terminals 16-17: Output 7 (normally open)
    Terminals 18-19: Output 8 (normally open)

Recommendations

The IC694MDL930 module is ideal for controlling a variety of output devices in industrial applications, including motor starters, solenoids, and indicators. It provides reliable control with isolated outputs for each point, ensuring that one relay failure does not affect others. To maximize relay contact life when switching inductive loads, use appropriate suppression circuits. The module is designed to handle high-voltage applications, and users must ensure the power supplied to connected devices meets the module’s voltage requirements.

>> IC694MDL930 Output modules User manual (pdf)

++ Other 90-30 PLC modules

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