DS3800HHRB1D1E | 8-Channel 100kHz Counter Input Board

Description

Product Introduction

The DS3800HHRB1D1E is the high-speed counter board with the 1D locking terminals and 1E asymmetric fusing—2.5A on Bank 1 and 5A on Bank 2. This board counts pulses from encoders, flow meters, and high-frequency sensors with a 32-bit count value, and the locking terminals ensure reliable connections in high-vibration environments. The 5A fuse on Bank 2 provides maximum headroom for extremely long cable runs (over 500 meters) where cable capacitance can cause significant inrush currents. The 24V DC input capability matches modern encoders and sensors, and the 100kHz input frequency range covers most industrial counting applications.

We’ve used the HHRB1D1E in a remote pipeline flow measurement application where the flow meter was located 600 meters from the control cabinet. The 5A fuse on Bank 2 handled the cable capacitance without nuisance trips, while the 2.5A fuse on Bank 1 was sufficient for shorter cable runs. The locking terminals prevented intermittent connections caused by pipeline vibration. The 32-bit count allowed us to totalize flow over a 24-hour period without overflow, and the 100kHz input frequency handled the flow meter’s output with margin.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: Why does the HHRB1D1E have mixed fusing (2.5A and 5A)?
A: The mixed fusing allows you to size protection for different cable runs. The 2.5A bank is for shorter runs (under 100 meters) or lower-capacitance cables. The 5A bank is for extremely long runs (over 500 meters) where cable capacitance can cause high inrush currents on power-up. The sensors themselves draw only 5mA each—it’s the cable capacitance that drives the need for higher fuse ratings.

Q: What’s the advantage of the locking terminals on the 1D suffix?
A: The locking terminals have a plastic latch that prevents the wire from pulling out under vibration. This is particularly important for counter inputs, where intermittent connections can cause missed pulses and counting errors. The locking mechanism is a simple but effective solution for high-vibration environments.

Q: Can I use the HHRB1D1E to count pulses from a flow meter?
A: Yes, the HHRB1D1E is ideal for flow meter pulse counting. The 32-bit count allows you to accumulate pulses over long periods without overflow, and the 100kHz input frequency handles most flow meter outputs. The 24V DC input matches standard flow meter outputs.

Q: What’s the maximum count value of the HHRB1D1E?
A: The HHRB1D1E has a 32-bit count, which provides a maximum value of 4,294,967,295 counts. At 100kHz, this would take over 11 hours to overflow. For most industrial applications, this is more than sufficient. If you need longer accumulation periods, you can read the count value periodically and reset it.

Q: How do I read the count value from the HHRB1D1E?
A: The count value is read by the Mark V controller via the backplane. The controller reads the 32-bit count value from the board’s registers. The specific register mapping is in GE’s application manual (GEI-100878). You’ll need to configure the Mark V to read the count values from the appropriate registers.

Q: Can I reset the count on the HHRB1D1E?
A: Yes, the Mark V controller can reset the count value to zero by writing to a control register on the HHRB1D1E. The specific control register mapping is in the application manual. The board also has a hardware reset option (jumper) that resets all counters when power is cycled, but software reset is the preferred method for normal operation.

Q: Does the HHRB1D1E have conformal coating?
A: Not by default. The 1D1E 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., DS3800HHRB1G1E). The standard HHRB1D1E is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

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