DS3800HIOD1G1G | GE Mark V Extreme-Temp I/O Expansion Board

Description

Product Introduction

The DS3800HIOD1G1G is the most ruggedized I/O expansion board in the Mark V lineup—conformal coating, 2.5A fusing on both banks, and an operating temperature range of -40°C to +85°C. This board provides 64 additional I/O points, making it suitable for large expansions in the harshest conditions. The conformal coating protects the PCB from moisture, dust, and chemicals, while the 2.5A fuses provide robust protection for expansion modules with moderate to high current requirements. The extended temperature range ensures reliable operation in arctic, desert, and un-conditioned outdoor installations. The 2.5A fuses balance protection and headroom for most expansion applications.

We’ve used the HIOD1G1G in an offshore oil platform expansion where the control cabinet was subject to salt spray, humidity, and temperature swings. The conformal coating protected the board from corrosion, and the extended temperature range ensured reliable operation in the un-conditioned equipment room. The 2.5A fuses handled the current requirements of the expansion modules without nuisance trips. The board’s 64 I/O point capacity allowed us to add all the required I/O points without multiple expansion boards.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the advantage of the conformal coating on the 1G1G?
A: Conformal coating is a thin polymeric film applied to the PCB that protects against moisture, dust, chemicals, and temperature extremes. The “1G” suffix indicates the board is conformal-coated, which is essential for offshore, desert, or high-humidity installations where corrosion and contamination can cause premature board failure.

Q: Why does the HIOD1G1G have 2.5A fuses instead of 5A?
A: The 2.5A fuses provide a balance between protection and headroom for most expansion applications. The 2.5A rating is sufficient for standard analog and discrete modules, while still providing some headroom for modules with moderate current requirements. The 5A variant (1G1E) is available for applications that require maximum headroom, such as expansions with many high-current output modules.

Q: What’s the difference between the HIOD1G1G and the HIOD1G1E?
A: The HIOD1G1G has 2.5A fuses on both banks, while the HIOD1G1E has 5A fuses on both banks. The 2.5A variant is suitable for most expansion applications, while the 5A variant provides maximum headroom for high-current modules or long cable runs. Both have conformal coating and the same extreme temperature range. The choice depends on your current requirements.

Q: How many I/O points can the HIOD1G1G support?
A: The HIOD1G1G supports up to 64 additional I/O points. This includes both analog and discrete I/O modules. If you need more than 64 points, you can use multiple HIOD boards, or combine HIOD and HIOB boards to achieve the required capacity.

Q: Does the HIOD1G1G require additional power?
A: The HIOD1G1G draws power from the Mark V backplane. It does not require a separate power supply. The additional I/O modules connected to the expansion backplane will also draw power from the system’s power supply. Check your total power budget when adding expansion boards.

Q: Can I use the HIOD1G1G with all Mark V I/O modules?
A: Yes, the HIOD1G1G is compatible with all Mark V I/O modules, including analog, discrete, frequency, and counter modules. The board provides the backplane interface for the modules to communicate with the main controller.

Q: What’s the backplane current draw of the HIOD1G1G?
A: The HIOD1G1G draws 1.0A from the 5V backplane rail. The Mark V power supply is rated at 6A on the 5V rail, so the HIOD1G1G is within the limit. If your rack has multiple HIOD boards, check your total backplane current. We recommend keeping total backplane current below 5.5A for margin. The extreme temperature range does not affect the current draw.

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