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Honeywell 2MLF-AD8A 8-Channel Analog Input Module
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- Part Number: 2MLF-AD8A
- Brand: Honeywell
- Type: Analog Input Modules
- Dimensions: 3.7×14×13.6cm
- Country of Origin: USA
- Barcode: 8537101190
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Additional Specifications
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Product Description
Honeywell 2MLF‑AD8A Analog Input Module
The Honeywell 2MLF‑AD8A, also cataloged as the 2MLF‑AD8A analog input module, serves as an 8‑channel current/voltage acquisition unit used to execute multi‑format analog signal conversion across HC900/ControlEdge measurement platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 2MLF‑AD8A |
| Brand | Honeywell |
| Origin | HC900 / ControlEdge I/O Platform |
| Weight | 140 g (shipping weight 2 kg) |
| Dimensions | Not specified |
| Operating Temp | Not specified |
| Power Consumption | Not specified |
| Product Type | 8‑Channel Analog Input Module |
| Channels | 8 channels per module |
| Data Format | Signed −8000 to 8000; Precise 4000–20000 / 0–20000; Percentile 0–10000 |
| Resolution | 14‑bit binary (data: 14 bits) |
| Max Conversion Speed | 250 µs per channel |
| Absolute Max Input | ±15 V, ±30 mA |
| Isolation Method | Photo‑coupler isolation between input terminal and PLC power (no channel‑to‑channel isolation) |
| Terminal Block | 18‑point terminal block |
| I/O Addressing | Fixed 64 points; variable 16 points |
4‑20 mA HART Loop Protocol and Channel Isolation Behavior
Although the 2MLF‑AD8A is a voltage/current measurement module rather than a loop‑powered transmitter interface, its conversion architecture aligns with Honeywell’s process‑instrumentation conventions. When installed alongside HC900 analog modules, the backplane maintains deterministic timing for 4‑20 mA HART loop protocol devices. The module uses photo‑coupler isolation between input terminals and PLC power, while HC900 I/O modules preserve channel‑to‑channel isolation for adjacent analog modules to prevent cross‑loop interference.
Frequently Asked Questions
Q: Can the 2MLF‑AD8A be hot‑swapped during operation? A: No. The module must be inserted or removed only when the controller rack is de‑energized.
Q: Does the 250 µs/channel conversion speed affect controller scan timing? A: Conversion speed determines how quickly each analog channel updates. Overall scan timing depends on the controller’s configured I/O strategy.
Q: Can each channel use a different data format? A: Yes. Each channel’s digital output format can be individually configured through user logic or via the SoftMaster I/O parameter interface.
Field Installation Guidelines
- Maintain consistent routing of analog wiring to avoid induced noise from high‑voltage conductors.
- Use shielded cable and bond the shield at a single termination point to prevent circulating currents.
- Ensure proper seating of the 18‑point terminal block before energizing the rack.
- Avoid mixing long‑run analog wiring with fast‑switching digital outputs to minimize electromagnetic coupling.
- Verify that input signals remain within the ±15 V / ±30 mA absolute maximum limits.
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