Honeywell MLF-AD08A Analog Input 8 Channel Module
Introduction:
The Honeywell MLF-AD08A provides eight analog input channels. This module accepts voltage or current signals with photo-coupler isolation.
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Product Overview
The Honeywell MLF-AD08A is an analog input module with eight channels. This module accepts both voltage and current signals. You can configure each channel independently for your sensor type. The device uses photo-coupler insulation between I/O terminals and power supply. It suits PLC and DCS systems needing multi-channel analog monitoring.
Voltage Input Specifications
The Honeywell MLF-AD08A accepts three voltage ranges. These are DC 1-5V, DC 0-5V, and DC 0-10V. Input resistance is 250 MΩ minimum for voltage measurements. This high impedance prevents loading of your signal source.
Key voltage specifications include:
Resolution (1-5V range): 1.25 mV
Resolution (0-5V range): 1.25 mV
Resolution (0-10V range): 2.5 mV
Absolute Maximum Input: ±15 V
The module converts voltage to several digital output formats. You can select unsigned values (0-4000), signed values (-2000 to 2000), precise values, or percentile values (0-1000).
Current Input Specifications
The MLF-AD08A accepts two current ranges. These are DC 4-20 mA and DC 0-20 mA. Input resistance is 250 Ω for current measurements. This standard burden resistor works with most industrial transmitters.
Key current specifications include:
Resolution: 5 μA for both ranges
Absolute Maximum Input: ±25 mA
Precise Value (4-20mA): 400-2000
Precise Value (0-20mA): 0-2000
Current inputs suit pressure, temperature, and flow transmitters. The 4-20 mA range with 400-2000 scaling is most common in process control.
Performance and Resolution
The Honeywell MLF-AD08A delivers fast and accurate conversion. Maximum conversion speed is 1.5 ms per channel. This means a full scan of all eight channels takes approximately 12 ms. Resolution is 12-bit binary data for all input types.
Digital output formats available:
Unsigned Value: 0 to 4000
Signed Value: -2000 to 2000
Precise Value: Varies by range (see table)
Percentile Value: 0 to 1000
Choose the format that matches your control system requirements. The 12-bit resolution provides 4096 discrete steps across each range.
Electrical Isolation
The MLF-AD08A uses photo-coupler insulation. This isolates I/O terminals from the power supply. Isolation improves noise immunity in industrial environments. It also protects your controller from field wiring faults.
Current consumption is 105mA at DC5V. It also consumes 85mA at DC24V. The module occupies 64 fixed I/O points in your system configuration.
Installation Guidelines
Follow these steps for proper installation:
Mount the MLF-AD08A in your Honeywell MLF rack.
Connect field wires to the 11-point terminal block.
For voltage inputs, use the appropriate range (1-5V, 0-5V, or 0-10V).
For current inputs, ensure your transmitter uses 4-20mA or 0-20mA.
Do not exceed ±15V or ±25mA absolute maximum inputs.
Configure each channel's range and format in your PLC program.
Use shielded twisted-pair cables for analog signals. Ground the shield only at the module end. Keep analog wiring away from AC power cables.
Package Contents
The box includes the following items:
Honeywell MLF-AD08A analog input module
11-point terminal block (pre-attached)
Module labeling sheet for channel identification
Quick start guide (printed)
Dust cover for unused slots
Common FAQs
Q1: Can I mix voltage and current inputs on the same MLF-AD08A?
A: Yes, each of the 8 channels is independently configurable. You can have voltage on channel 1 and current on channel 2.
Q2: What is the maximum conversion speed for all eight channels?
A: Each channel converts in 1.5 ms. All eight channels take approximately 12 ms for a full scan.
Q3: What happens if I apply 24V to a voltage input channel?
A: The absolute maximum voltage input is ±15 V. Applying 24V may damage the MLF-AD08A permanently.
Q4: How do I scale the 4-20 mA input to engineering units?
A: Use the precise value output of 400-2000. Scale this 0-2000 range to your desired units in your PLC program.
Q5: What is the input resistance for current measurements?
A: Current inputs have a 250 Ω burden resistor. This is standard for 4-20 mA loop-powered transmitters.
Dimensions and Power
The product has these physical specifications:
Weight: 70 g
Analog Input Points: 8 channels per module
Terminal Type: 11-point terminal block
Current Consumption (DC5V): 105 mA
Current Consumption (DC24V): 85 mA
I/O Points Occupied: 64 fixed points
Insulation Method: Photo-coupler isolation
The Honeywell MLF-AD08A analog input module delivers reliable signal acquisition. Its eight channels support both voltage and current sensors. Order the MLF-AD08A for your next Honeywell control system expansion.