Supply your industrial systems with the HONEYWELL MLF-AD04A Analog Input Module. This 4-channel unit is available in Brand New, Original Stock condition with Global Shipping. Secure precise process data logging today.
The HONEYWELL MLF-AD04A, also cataloged as the MLF-AD04A Analog Input Module, operates as a dedicated hardware component for converting continuous field voltage and current signals into discrete digital values within MasterLogic-50 system racks. The unit interfaces directly with analog field transmitters, utilizing 4 isolated input channels to execute data acquisition routines without introducing signal attenuation across the system backplane.
| Parameter | Specification |
|---|---|
| Model | MLF-AD04A |
| Brand | HONEYWELL |
| Origin | USA |
| Weight | 0.4 kg |
| Dimensions | 7 x 14 x 14.5 cm |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 120 mA at 5 VDC internal backplane current |
| Module Type | Analog Input Module |
| Input Channels | 4 channels |
| Voltage Input Ranges | 0 to 5 VDC, 1 to 5 VDC, 0 to 10 VDC |
| Current Input Ranges | 0 to 20 mA, 4 to 20 mA |
| Input Resistance | 250 ohm nominal |
| System Classification | DCS / PLC |
| Communication Service | Ethernet router backplane infrastructure |
The module incorporates continuous channel-to-channel isolation and 4-20 mA HART loop protocol compatibility layers to filter high-frequency common-mode electrical noise. An on-board analog-to-digital converter executes multi-range signal mapping across software-configured thresholds. Cold junction compensation (CJC) algorithms and galvanic barrier insulation prevent ground-loop current loops from corrupting localized industrial network processes.
Q: How is the input signal type (voltage or current) configured for each channel?
A: Channel modes are selected independently via software parameters within the PLC/DCS programming environment. Internal mechanical switches are not required to shift between voltage and current ranges.
Q: What happens to the channel data if the field signal drops below 4 mA?
A: The module executes a wire-break detection routine when configured for 4-20 mA mode. A signal dropping below specified operational thresholds triggers a diagnostic fault flag across the system backplane.
Q: Is external power required to loop-power 2-wire transmitters?
A: Yes. The MLF-AD04A measures incoming analog signals but does not distribute auxiliary loop power to field transmitters. An external 24 VDC power supply must be integrated into the current loop wiring.
1. Mount the module onto the dedicated backplane slot until the integrated retaining clips click into place, securing the physical chassis.
2. Separate analog signal lines from AC power grids or variable frequency drive cables by at least 100 mm to suppress electro-magnetic induction.
3. Terminate signal cables utilizing shielded twisted-pair (STP) wires, grounding the shield exclusively at the control cabinet entry point.
4. Verify all terminal connection screws are torqued properly to maintain clean interface electrical contact under vibration-prone settings.
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