DS3800HIOA1B1A | GE Mark V I/O Expansion Base Board

Description

Product Introduction

The DS3800HIOA1B1A is the I/O expansion board in the 1B1A configuration—spring-cage terminals on Bank 1 and 0.8A fusing, with 0.5A fusing on Bank 2. This board extends the Mark V system’s I/O capacity by providing additional backplane slots, and the spring-cage terminals reduce termination time compared to screw-clamp. The mixed fusing allows you to match protection to different types of I/O modules or cable runs. The 32 I/O point capacity is sufficient for most expansion needs.

We’ve used the HIOA1B1A in a retrofit project where we needed to add 24 additional I/O points to an existing Mark V system. The spring-cage terminals made field wiring faster, and the mixed fusing allowed us to use the 0.8A bank for the I/O modules with higher current requirements and the 0.5A bank for the lower-current modules. The board integrated seamlessly with the main controller, and the expansion was completed without any issues.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the advantage of the spring-cage terminals on the 1B suffix?
A: Spring-cage terminals use a stainless steel spring to grip the wire—push the wire in and it’s locked. This is faster than screw-clamp (which requires a screwdriver and torque control). Spring-cage is also more resistant to vibration loosening. The 1B1A is the preferred choice for new installations where wiring speed matters.

Q: Why does the HIOA1B1A have mixed fusing (0.8A and 0.5A)?
A: The mixed fusing allows you to match protection to different types of I/O modules or cable runs. The 0.8A bank is for I/O modules with higher current requirements or longer cable runs. The 0.5A bank is for lower-current modules or shorter cable runs. This provides flexibility while maintaining protection.

Q: How many I/O points can the HIOA1B1A support?
A: The HIOA1B1A supports up to 32 additional I/O points. This includes both analog and discrete I/O modules. If you need more than 32 points, you can use multiple HIOA boards or the higher-capacity HIOB variant (64 points).

Q: Can I use the HIOA1B1A with all Mark V I/O modules?
A: Yes, the HIOA1B1A 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: Does the HIOA1B1A require additional power?
A: The HIOA1B1A 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: Does the HIOA1B1A have conformal coating?
A: Not by default. The 1B1A suffix indicates spring-cage terminals and mixed fusing, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HIOA1G1A). The standard HIOA1B1A is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

Q: Can I use the HIOA1B1A to expand a Mark V system beyond its standard capacity?
A: Yes, the HIOA1B1A is specifically designed for system expansion. You can add multiple HIOA boards to expand the I/O capacity further. However, the total number of I/O points is limited by the Mark V controller’s addressing capacity. Check the system specifications before planning a large expansion.

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