DS3800HIOA1C1D | Mark V I/O Rack Expansion Module

Description

Product Introduction

The DS3800HIOA1C1D is the I/O expansion board in the 1C1D configuration—locking spring-cage terminals with 1A fusing on Bank 1 and 2.5A fusing on Bank 2. This board extends the Mark V system’s I/O capacity while providing the vibration resistance of locking terminals. The mixed fusing allows you to match protection to different types of I/O modules—1A for standard modules and 2.5A for modules with higher current requirements or longer cable runs. The 32 I/O point capacity is sufficient for most expansion needs, and the locking terminals ensure reliable connections in high-vibration environments.

We’ve used the HIOA1C1D in a compressor station expansion where the control cabinet was subject to constant vibration. The locking terminals prevented intermittent connections on the expansion backplane, and the 2.5A bank handled the high-current output modules that drove the compressor’s actuators. The 1A bank was used for the standard analog 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 locking terminals on the 1C suffix?
A: The locking terminals have a plastic latch that prevents the wire from pulling out under vibration. This is particularly important for expansion boards, where intermittent connections on the expansion backplane can cause I/O faults. The locking mechanism is a simple but effective solution for high-vibration environments. The 1C suffix adds the locking feature to the standard spring-cage terminals (1B).

Q: Why does the HIOA1C1D have mixed fusing (1A and 2.5A)?
A: The mixed fusing allows you to match protection to different types of I/O modules. The 1A bank is for standard analog and discrete modules with moderate current requirements. The 2.5A bank is for modules with higher current requirements, such as output modules driving inductive loads, or for longer cable runs where capacitance can cause inrush currents. This provides flexibility while maintaining protection.

Q: How many I/O points can the HIOA1C1D support?
A: The HIOA1C1D 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 HIOA1C1D with all Mark V I/O modules?
A: Yes, the HIOA1C1D 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 HIOA1C1D require additional power?
A: The HIOA1C1D 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 HIOA1C1D have conformal coating?
A: Not by default. The 1C1D suffix indicates locking terminals and mixed fusing, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HIOA1G1D). The standard HIOA1C1D is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

Q: Can I use the HIOA1C1D to expand a Mark V system beyond its standard capacity?
A: Yes, the HIOA1C1D 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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