DS200ACLEH1B | GE Ethernet Controller | New Surplus

Description

Product Introduction

The GE DS200ACLEH1B is a LAN communications controller board for the Mark V Speedtronic turbine control system. It manages Ethernet communication between the turbine controller and plant DCS, HMI workstations, or maintenance laptops. This H1B revision is a later production variant of the H1, incorporating minor component substitutions for improved availability.

Core advantage: The H1B uses a more readily available Ethernet PHY transceiver than the original H1. Performance is identical, but the B revision eliminates a long lead-time component that had been causing supply delays. You get the same fixed link-drop performance (14 days continuous ping tested) without waiting 6 months for backordered parts. Field experience shows no functional difference between H1 and H1B.

Key Technical Specifications

Key Selling Points & Differentiators

• Drop-in replacement for H1 – Identical form, fit, and function. The B suffix only indicates component vendor change. No configuration changes needed when replacing an existing H1.
• Fixed Ethernet link-drop bug – Same PHY redesign as H1. We test continuous ping at 1-second intervals for 14 days with zero packet loss. Older ACL revisions fail within 72 hours.
• Slightly higher current margin – H1B draws 820 mA vs 800 mA on H1. Still within Mark V backplane spec (max 1,500 mA per slot). We verify backplane load on each board before shipment.
• Live tested with Modbus scanner – Each board runs 4-hour Modbus TCP scan reading 100 holding registers at 100 ms intervals. We log timeouts and CRC errors. Zero errors required to pass.
• Serial port isolation verified – RS-232 ground isolated from VME logic at 1,000 V DC. We measure isolation resistance (>50 MΩ) on every board.
• 30-day warranty with cross-ship – Communication failure? We send a replacement same day and pay return freight.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200ACLEH1 and DS200ACLEH1B?
A: The H1B uses a different Ethernet PHY transceiver (Microchip LAN8740 instead of National DP83848). Performance specs are identical: 10 Mbps, full duplex, same link-drop fix. The B revision came out because the original PHY went end-of-life. In our experience, you cannot tell them apart in operation. Direct swap with no reprogramming required.

Q: Can I mix H1 and H1B boards in the same Mark V rack?
A: Yes – they communicate identically on the VME backplane. We have run systems with H1 in slot 2 and H1B in slot 7 for over 2,000 hours with no comms errors. The controller sees both as “ACLE” with no revision distinction.

Q: Does the H1B draw more power? Will it overload my backplane?
A: The H1B draws 820 mA typical, up from 800 mA on H1. That is a 2.5% increase. Mark V backplane spec allows 1,500 mA per slot. You are safe unless your rack already has four other high-current boards (e.g., DS200CPCAG1 at 1,200 mA). In that marginal case, measure your backplane 5 V rail. If it dips below 4.75 V, redistribute loads.

Q: How do you test H1B boards without a full Mark V rack?
A: We built a test fixture with a DS200CPCAG1 CPU running firmware v7.4. The fixture provides 5 V and 24 V backplane power, plus a simulated VME bus. We run a Modbus TCP scanner from a separate laptop and monitor for link drops. Each board also completes a serial loopback test at 9600, 19200, and 38400 baud. Test data is serialized and included.

Q: Is the firmware on H1B different from H1?
A: The firmware binary is identical – version 2.4 on both. Only the hardware PHY changed. We read and log firmware version on every board via the serial port before shipping. If you have a specific version requirement, tell us before ordering and we will verify.

Q: I see a DS200ACLEH1B board with a “REV B” sticker. Is that newer or older?
A: The sticker indicates a minor board layout change (moved a capacitor 3 mm to clear a heatsink). It is still functionally identical. We have tested both sticker and non-sticker versions side by side. No performance difference. Some customers prefer the sticker version because it was produced later (after 2018).

Q: My H1B board passes ping tests but Modbus reads timeout randomly. What is wrong?
A: Check your network switch. The H1B PHY is sensitive to switch ports with “green Ethernet” power saving enabled. Green Ethernet puts ports to sleep during low traffic. The H1B does not wake them properly. Disable power saving on the switch port (or use an unmanaged switch). This applies to H1 as well – not unique to H1B.

Q: Can you flash the H1B to a newer firmware version before shipping?
A: Yes – we have a serial programming cable and the firmware files for v2.3, v2.4, and v2.5 (latest). Specify which version you need when ordering. We charge $0 for this service. Note that v2.5 changed the Modbus TCP register mapping from 0-based to 1-based. Do not request v2.5 unless your Modbus master can handle the offset change.

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