DS3810MMAB | New Surplus GE Speedtronic Part

Description

Product Introduction

The DS3810MMAB is a mixed digital I/O module in GE’s Mark VIe line—the one that gives you 8 digital inputs and 8 digital outputs on a single board. The “MMA” designation indicates a Mixed Module, Analog/Digital (though this one is all-digital), and the “B” suffix is a revision with improved isolation and diagnostic capability.

You’ll find this board in Mark VIe cabinets where space is limited and you need a mix of inputs and outputs—simple control loops like on/off valve control with position feedback, or interlocking circuits where you need a few inputs and a few outputs together. The 8 inputs are optically isolated, 24V DC with programmable filtering to reject contact bounce. The 8 outputs are high-side switching, 24V DC at 0.5A per channel, with short-circuit protection. The board saves rack space by combining both functions in one slot. Typical users are plant engineers with space-constrained cabinets or those simplifying I/O layouts for smaller control systems.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: Can I hot-swap this board?

No. The Mark VIe backplane does not support live insertion. Power down the entire I/O pack before removal. The mixed I/O architecture is sensitive—we’ve seen output drivers latch if hot-swapped.

Q: How is the MMAB different from the MMA?

The MMAB has:

• Improved isolation: 2.5 kV vs 1.5 kV to backplane.
• Better diagnostics: Open-wire detection on inputs, short-circuit detection on outputs.
• Wider temperature range: 0-60°C vs 0-50°C on some MMA versions.

The I/O count and electrical ratings are the same.

Q: Can I use the inputs and outputs independently?

Yes—each input and output channel is independent. The 8 inputs don’t have to match the 8 outputs. You can use the board for mixed signals without any correlation between channels.

Q: What loads can I drive with the outputs?

The outputs are rated for 0.5A continuous, 1.0A peak. That covers:

• Solenoid valves: Most hydraulic and pneumatic valves draw 0.1-0.4A.
• Relay coils: Small to medium relays up to 0.5A.
• Indicator lamps: 24V LEDs or incandescent lamps.

For larger loads, use an external contactor driven by the output.

Q: How do you test this board before shipping?

We run a 7-step test testing inputs and outputs together:

• Visual inspection: Check for cracked connectors, burnt traces, swollen capacitors.
• Power-up: Apply +5V DC and +24V field power. Measure current draw.
• Communication handshake: Simulate backplane connection, verify board ID.
• Input test: Apply 24V to each input and verify the board reads ON. Test threshold by sweeping voltage from 0-24V.
• Output test: Command each output ON and verify the output voltage is within 0.5V of field power under a 0.5A load.
• Protection test: Short each output and verify the channel shuts down and flags a fault.
• 24-hour soak: Run at 50°C ambient with inputs toggling and outputs at 0.5A load. Log errors—failure threshold is >0.1% missed transitions or overcurrent fault.

We reject about 2% of these boards—the mixed design is reliable.

Q: What’s the most common failure on this board?

Two things:

• Output driver burnout: If an output is shorted, the protection usually saves it, but repeated faults can wear it out. We replace output drivers on about 10% of refurbished units.
• Optocoupler degradation on inputs: The input optocouplers can age, increasing the ON threshold. We test thresholds during refurbishment.

Q: Can I use this board with 120V AC inputs?

No. The inputs are 24V DC only. Use an external relay or optocoupler to convert 120V AC to 24V DC.

Q: Are there counterfeit versions of this board?

Yes. Look for:

• Output driver ICs: Genuine boards use specific driver ICs. Counterfeits use generic drivers with lower current ratings.
• Optocouplers: Genuine boards use specific optocouplers. Counterfeits use generic parts.
• Label: Genuine—matte finish, greenish barcode. Fakes—glossy.

We trace stock to decommissioned assets. If buying elsewhere, demand photos of the component side and serial sticker.

Q: What’s your warranty?

1-year against functional defects. For mixed I/O boards, we guarantee both input thresholds and output drivers for the warranty period—if either fails or drifts out of spec, we’ll replace or repair it.

Q: What’s the lead time?

We typically carry 3-5 units. Orders before 2 PM EST ship within 1-2 business days after testing. The 24-hour soak is mandatory—we won’t skip it. Expedited shipping available with waiver.

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