Honeywell MLE-DC32A Digital Input Module Overview

The Honeywell MLE-DC32A is a 32 channel digital input module. It belongs to the MLE Series from Honeywell. This module accepts 24 VDC signals from field devices. Users select the MLE-DC32A for high density input applications. The module has a common method of 32 points per COM. A compact design saves space in control cabinets.

Technical Specifications of MLE-DC32A

The Honeywell MLE-DC32A has 32 input points per module. Rated input voltage is 24 VDC. Rated input current is 4 mA per point. Operation voltage range is DC20.4 to 28.8 V. The ripple rate must stay below 5%. Input resistance is 5.6 kΩ per channel.

On state requires voltage of DC19V or higher. On state current must be 3 mA or higher. Off state requires voltage of DC6V or lower. Off state current must be 1 mA or lower. These thresholds ensure reliable signal detection. The module uses a 32 point per COM common method.

Response time is adjustable through CPU parameters. Both Off to On and On to Off have the same options. Available settings are 1ms, 3ms, 5ms, 10ms, 20ms, 70ms, and 100ms. Default response time is 3ms for both transitions. This flexibility matches various field device requirements.

Insulation resistance is 10 MΩ or more by megger test. Internal current consumption is only 50 mA. The module weight is 60 grams for easy mounting. The MLE-DC32A does not include isolation between channels. All 32 points share a common reference.

Installation Guidelines for Honeywell MLE-DC32A

Mount the MLE-DC32A in a Honeywell MLE Series rack. Align the module with the correct slot position. Push firmly until the connectors engage fully. Secure the module with the locking mechanism. Connect field wiring to the 32 point terminal block.

Use twisted pair cables for each input signal. Connect the common return wire to the COM terminal. Apply 24 VDC power within the 20.4 to 28.8 V range. Set the response time using CPU configuration software. Do not apply voltage above 28.8 VDC to any input. Verify each input turns on above DC19V threshold.

Package Contents of MLE-DC32A

Your shipment includes these items:

One Honeywell MLE-DC32A digital input module

One 32 point terminal block for field wiring

One module locking latch (pre-installed)

One installation instruction sheet

Thirty two input channel labels for identification

The package does not include the backplane rack. You must purchase the rack separately. No configuration software is provided with this module.

Frequently Asked Questions about MLE-DC32A

1. What is the maximum response time on MLE-DC32A?

The Honeywell MLE-DC32A supports up to 100ms response time. This is the slowest setting available through CPU parameters. Use slower settings to filter out electrical noise. Use faster settings for high speed counting applications.

2. Can I mix different voltage sensors on the same module?

No, the MLE-DC32A only accepts 24 VDC signals. All 32 inputs share the same voltage range. Using higher voltages will damage the module. Using lower voltages may not trigger the On state reliably.

3. What is the common method for this input module?

The Honeywell MLE-DC32A uses 32 point per COM method. This means all 32 inputs share one common return. You must connect all sensor returns to the same COM terminal. This is a sink type input configuration.

4. How do I test the insulation resistance on MLE-DC32A?

Use a megger tester set to 500 VDC for MLE-DC32A. Connect between all input terminals and ground. The reading must be 10 MΩ or higher. Do not perform this test with the module connected to power.

5. What is the internal current consumption of this module?

The Honeywell MLE-DC32A consumes only 50 mA internally. This is the current drawn from the backplane power supply. The input current (4 mA per point) comes from field devices. Total power depends on how many inputs are active.

Compatibility and Application Notes

The Honeywell MLE-DC32A works with Honeywell MLE Series controllers. It suits high density digital input applications. Use it for limit switches, push buttons, and proximity sensors. The adjustable response time matches various field device speeds. This module does not have channel-to-channel isolation. Plan your wiring with the 32 point per COM limitation. The HS code for customs is 85389000. Store the module in anti-static packaging before installation.