DS3800HIMA1C1D | Full Suffix Mark V High-Density Analog Card

Description

Product Introduction

The DS3800HIMA1C1D is the high-density analog input board with locking spring-cage terminals and asymmetric fusing—1A on Bank 1 and 2.5A on Bank 2. This board is designed for applications where you need the vibration resistance of locking terminals and the flexibility to match fuse ratings to different cable runs. The 1A bank is suitable for standard transmitters on moderate cable runs, while the 2.5A bank provides headroom for long cable runs or transmitters with higher inrush. The 16-channel capacity and 12-bit resolution make it suitable for a wide range of analog input applications.

We’ve used the HIMA1C1D in a compressor station where the control cabinet was subject to constant vibration. The locking terminals prevented intermittent connections on the analog inputs, and the 2.5A bank handled the 200-meter cable runs to the pressure transmitters on the compressor skid. The 1A bank was used for the short runs to the temperature sensors in the control room. The board’s performance was flawless—no nuisance trips, no intermittent signals.

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 analog inputs, where intermittent connections can cause signal drift or loss. 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 HIMA1C1D have mixed fusing (1A and 2.5A)?
A: The mixed fusing allows you to match protection to different cable runs. The 1A bank is suitable for moderate cable runs (50-100 meters) or standard transmitters with low inrush. The 2.5A bank is for longer cable runs (over 100 meters) where cable capacitance can cause inrush currents. The transmitters themselves draw only 20mA each—it’s the cable capacitance that drives the need for higher fuse ratings.

Q: Can I mix 4-20mA and 0-10V signals on the same HIMA1C1D board?
A: Yes, the HIMA1C1D allows per-channel configuration via jumpers. Each channel has a jumper block that selects current or voltage mode. The board supports 4-20mA, 0-20mA, 0-10V, and ±10V inputs. Make sure to set the jumpers correctly for each channel before installation.

Q: What’s the scan rate of the HIMA1C1D?
A: The HIMA1C1D scans all 16 channels in about 25ms. The scan rate is the same as the 8-channel HCMA, despite having twice the channels. This is because the HIMA uses a multiplexed ADC that cycles through the channels at high speed.

Q: Does the HIMA1C1D provide loop power for 4-20mA transmitters?
A: No. The HIMA1C1D does not provide loop power. You’ll need an external 24V DC power supply for the transmitter loops. The board’s 250Ω input impedance is compatible with most 4-20mA transmitters. If your transmitter requires a specific loop resistance, check the transmitter’s data sheet.

Q: The HIMA1C1D has a 1.2A backplane current draw. Is that typical for a 16-channel analog board?
A: Yes, the 1.2A draw is typical for a 16-channel analog input board. The Mark V power supply is rated at 6A on the 5V rail, so the HIMA1C1D is within the limit. If your rack has multiple HIMA boards, check your total backplane current. We recommend keeping total backplane current below 5.5A for margin.

Q: Does the HIMA1C1D 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., DS3800HIMA1G1D). The standard HIMA1C1D is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

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