Key Technical Specifications

• Input Channels: 8 independent channels for analog signal measurement.
• Resolution: 8-bit, providing 256 discrete steps for signal processing.
• Voltage Range: 0 to 10 VDC input with a 100 kiloOhms input impedance.
• Conversion Time: 1 millisecond, ensuring rapid data updates for the controller.
• Current Consumption: Varies by channel (e.g., Ch1: 25 mA, Ch3: 60 mA, Ch2: 0 mA).
• Isolation: No isolation between DC inputs or from ground.
• Certification: UL listed for industrial safety compliance.
• Operating Temp: 0°C to +55°C (Storage: -20°C to +70°C).
• Humidity: 30% to 90% non-condensing.

 

Product Introduction

When you’re dealing with legacy Reliance Shark XL systems, finding reliable I/O cards is usually a nightmare. The 45C992 is an 8-channel analog input module that takes 0-10VDC signals and digitizes them at 8-bit resolution. It’s not high-res by modern standards, but for basic monitoring like tank levels or basic pressure readings, it does the job. I’ve seen these running in water treatment plants for decades, just quietly converting analog signals for the main processor.The real value here is keeping old gear alive. With a 1ms conversion time, it’s fast enough for most non-critical process loops. Just remember, this card has zero isolation between channels. If you’ve got noisy grounds or floating signals, you’re going to see garbage data. It’s a solid, basic card, but you have to respect its electrical limits. If your application requires channel-to-channel isolation, this isn’t the part you want.

Quality SOP & Tech Pitfalls

We don’t sell untested vintage iron. Every 45C992 gets a visual inspection for cracked solder joints or corroded traces. Then, it goes on a Shark XL test rack where we inject known 0-10VDC signals into all eight channels and verify the digital values match the input within the 8-bit tolerance. We check the current draw on each channel and seal it in anti-static packaging before it ever hits a box.Here is the brutal truth about this card: it is completely obsolete. Reliance stopped making the Shark XL line years ago. The biggest pitfall I see is guys buying these off eBay without checking the channel current draw. Channel 3 pulls 60 mA, while Channel 2 pulls nothing. If you’re daisy-chaining power or using a weak backplane supply, you might overload the rail and crash the whole rack. Also, since there is no isolation, I once saw a guy wire a 10V sensor directly to this card while the sensor ground was tied to a VFD. The resulting ground loop fried three channels instantly. Watch your grounding.

 

Installation & Configuration Guide

1. Pre-Installation: ⚠️ Shut down the Shark XL chassis power completely. Wait 60 seconds for the backplane capacitors to discharge. Take a photo of the wiring and DIP switch settings on the old 45C992 before removing it.
2. Removal: Label every wire meticulously. Release the DIN clips or unscrew the mounting hardware. Pull the card straight out to avoid bending the backplane pins.
3. Installation: Verify the channel current requirements against your backplane power budget. Seat the new 45C992 firmly and secure it. Reconnect the 0-10VDC wires exactly as photographed, ensuring all sensor grounds are tied to a clean, single-point ground.
4. Power-On & Testing: Restore chassis power. Check the module status LED. Use the PLC programming software to force a known voltage into Channel 1 and verify the raw integer value matches the expected 8-bit calculation. Repeat for all active channels.

Compatible Replacement Models

• ✅ Drop-in Replacement: 45C992 (Exact Match). Since this is an obsolete card, finding a new surplus 45C992 is the only true drop-in. No software changes required.
• ⚠️ Software Compatible: None. The Shark XL architecture is proprietary. You cannot use a modern Allen-Bradley or Siemens analog card without replacing the entire CPU and backplane.
• ❌ Hardware Mod Required: Upgrading to a modern DCS/PLC. If you are tired of hunting for obsolete 45C992 cards, you need to migrate the entire Shark XL system. This requires rewiring every sensor and rewriting the logic. Plan for weeks of downtime.

 

Frequently Asked Questions (FAQ)

Can I use a 4-20mA current loop sensor with this card?
Not directly. The 45C992 is strictly a 0-10 VDC voltage input card with a 100k ohm impedance. If you try to wire a 4-20mA source directly, you’ll get bad data. You must install a 250-ohm precision resistor across the input terminals to convert the current to a 1-5VDC signal.Is 8-bit resolution still usable in modern applications?
It depends. 8-bit gives you 256 steps. For a 0-10V scale, that’s about 39mV per step. If you’re monitoring a large tank where a few inches of level doesn’t matter, it’s fine. If you’re doing precise batching or lab-quality measurements, 8-bit is going to make your process look like a staircase. You’ll need to upgrade your whole system.Why is my reading jumping around randomly?
Remember, this card has NO isolation. You likely have a ground loop. Check if your sensor ground is tied to a motor frame or a VFD ground. Disconnect the sensor wire from the card and measure the voltage between the wire and card ground. If you see more than a few millivolts of AC noise, fix your grounding before you blame the card.Can I hot-swap this module if it fails?
I wouldn’t risk it. While some modern backplanes support hot-swapping, the Shark XL is old tech. Pulling an analog card while the backplane is energized can cause a voltage spike that fries the CPU or other I/O cards. Take the 5 minutes to power down the rack safely.How do I know if the card is completely dead?
If the module status LED is off and you have verified 24VDC (or whatever the logic power is) at the backplane, the card’s internal power supply is likely fried. If the LED is on but the PLC reads zero or maxed out regardless of input, the ADC chip is probably toast. Swap it out.