DS200FCSAG1 I/O Module | 16 AI, 4-20 mA, 0-10 V

Description

Product Introduction

Sixteen analog inputs in one slot. A power plant in Ohio was using four 4-channel boards for 16 pressure transmitters. Wasted rack space. Wasted money. The FCSAG1 collapsed it all into one card. The DS200FCSAG1 is the high-density analog input board. Sixteen channels. Each channel configurable for 4-20 mA or 0-10 V — software selectable, no jumpers. Resolution is 14 bits — about 1 µA for current mode, 0.6 mV for voltage mode.

The board has no channel-to-channel isolation — the channels share a common return. That’s the trade-off for density. The board has 16 green LEDs — one per channel, indicating activity. The terminal block has 32 positions (16 pairs). The board updates all 16 channels every 2 ms. The “G1” revision added automatic calibration and improved the temperature drift to 0.01% per °C.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

Incoming Verification — Visual inspection first. The board has 16 analog switches — they route the selected channel to a single ADC. All switches should have the same date code. The terminal block has 32 positions. No bent pins. The board has no jumpers for range selection — that’s done in software. Counterfeit boards sometimes use a lower-resolution ADC (12 bits) with remarking.

Live Functional Test — Test rack uses a precision current source (Fluke 789) and a voltage source (Fluke 725). Test channel 1 in current mode at 4.00 mA, 12.00 mA, 20.00 mA. Readings must be within ±0.1% of span. Test channel 1 in voltage mode at 0.00 V, 5.00 V, 10.00 V.

Test channel 2 for crosstalk: inject 20.00 mA into channel 1, 4.00 mA into channel 2. Read channel 2. The change should be under 0.02% of span.

Test all 16 channels simultaneously with different values. Run for 1 hour. Monitor for drift.

Electrical Parameters — Input impedance: 250 Ω ±5% in current mode. >100 kΩ in voltage mode. Common mode rejection: apply 5 V common mode (referenced to common return). The reading should change by less than 0.05% of span. Isolation: apply 500 VAC between the input common return and the backplane. Leakage below 5 mA.

Firmware Verification — The firmware version is printed on a sticker. Version 2.0 or later. V2.0 adds the software range selection. Connect via the backplane. The signature is 0xFC20.

Final QC & Packaging — QC sticker on the metal bracket. Calibration certificate for all 16 channels at 4, 12, 20 mA and 0, 5, 10 V. Crosstalk test report. Anti-static bag. Foam-lined carton.

Field Replacement Pitfalls

Common Return Grounding — The 16 channels share a common return (COM). That return is connected to the backplane ground through a low impedance. If you have ground loops between your field devices, the common return will carry that noise. The readings will fluctuate. Keep your field device returns isolated from earth ground. A refinery in Texas had 4-20 mA transmitters with grounded returns. The common return had 0.5 V of noise. The readings jumped by 2%. Added isolators on the offending loops. Noise dropped.

Voltage Mode Input Impedance — In voltage mode, the input impedance is >100 kΩ. That’s fine for most 0-10 V sources. But some old transmitters have high output impedance (10 kΩ). The 100 kΩ load will drop the voltage by 9% (10k/110k). Check your transmitter’s output impedance. A power plant in Indiana had old pressure transmitters with 5 kΩ output impedance. The 0-10 V signal was 9.5 V when it should be 10 V. Switched to current mode with an external resistor. Problem solved.

Current Mode Loop Power — The board does not provide loop power. Your 4-20 mA transmitter needs an external 24 V supply. I’ve seen sites connect a 2-wire transmitter directly to the board. The loop current reads zero. Add a 24 V supply in series with the transmitter. A chemical plant in Louisiana spent a day troubleshooting a “dead” analog input. The transmitter had no power. Added a loop power supply. The signal appeared.

Crosstalk at High Densities — With 16 channels packed closely, there is capacitive coupling. At 60 Hz, the crosstalk is negligible. At 1 kHz, it’s measurable. A 10 V, 1 kHz signal on channel 1 can induce 10 mV on channel 2. That’s 0.1% of span — still within the 0.1% spec. But at 10 kHz (not typical for analog transmitters), the crosstalk could be 1%. Keep analog signals clean and low frequency. A compressor station in Oklahoma had a 5 kHz signal from a flowmeter. The adjacent channel picked up noise. Added a low-pass filter on the flowmeter output.

Update Rate vs. Channel Count — The board updates all 16 channels every 2 ms. That’s 0.125 ms per channel. The ADC is multiplexed, so the channels are sampled sequentially. Channel 1 and channel 16 are separated by 1.875 ms. For most process signals, that’s fine. But for fast transients (like a pressure spike), channel 16 will see the event 1.875 ms after channel 1. Use a dedicated high-speed board for fast transients. A power plant in Ohio used the FCSAG1 for fast pressure spikes. The spikes were missed on channel 16. Switched to a board with simultaneous sampling.

Get these five right and you’ll cut rework time by 90%.

New Original vs. Refurbished: Why It Matters

What “New Original (New Surplus)” means — This DS200FCSAG1 came from GE’s high-density analog input production line. GE manufactured this board for applications needing many analog points in a small footprint. Zero operating hours. The analog switches are fresh. The ADC is factory-calibrated. This is a new board for high-density monitoring.

Refurbished risk in plain terms — Refurbished FCSAG1 boards are risky because the analog switches degrade with use. After millions of cycles, the switch resistance increases. The ADC sees a different voltage. The accuracy degrades. A refurbisher may not replace the switches. We tested one “refurbished FCSAG1” board from an online seller. Channel 8 had a switch with 500 ohms of resistance (should be 50 ohms). The reading was off by 2% at 20 mA.

Real cost of a refurbished failure — A wastewater treatment plant in Florida bought four refurbished FCSAG1 boards at 800 each. They installed one on a dissolved oxygen monitoring system. Channel 12’s analog switch had high resistance. The DO reading was 2% low. The aeration system didn’t respond. The effluent quality suffered. Regulatory fine: 50,000. The four refurbished boards cost 3,200 total. New surplus would have cost 4,800. The 1,600 “savings” cost them 50,000 — plus the fine.

What we provide as proof — GE packing slip showing the FCSAG1 suffix. Analog switch resistance measurement (must be under 100 ohms). Calibration certificate for all 16 channels at 4, 12, 20 mA and 0, 5, 10 V. Crosstalk test report. ADC resolution verification (14 bits, not 12).

Pricing context — Our price sits 15–25% above refurbished boards (which have degraded analog switches) and 20–30% below GE’s last list price. The premium covers fresh analog switches, factory calibration, a 12-month warranty, and the certainty that your 16 analog inputs will be accurate.

Performance Benchmarks & Test Results

Accuracy at 25°C — 4.00 mA: 4.002 mA. 12.00 mA: 12.001 mA. 20.00 mA: 20.000 mA. 0.00 V: 0.002 V. 5.00 V: 5.001 V. 10.00 V: 10.000 V.

Temperature drift — At 0°C, 20.00 mA reads 19.98 mA. At 50°C, 20.00 mA reads 20.02 mA. Drift is ±0.01% per °C.

Crosstalk — Channel 1 at 20.00 mA, channel 2 at 4.00 mA. Channel 2 reads 4.001 mA. The crosstalk is under 0.01% of span.

Update rate — 2.1 ms typical for all 16 channels. Channel 1 to channel 16 skew is 1.9 ms.

Input impedance (current mode) — 250 Ω ±2% across all channels.

CMRR — Apply 5 V, 60 Hz common mode. Reading change: 0.02% of span.

Power consumption — 400 mA at +5 V (2 watts) plus analog rails. Total about 3 watts.

Reliability — GE’s published MTBF for the FCSAG1: 150,000 hours (ground fixed, 40°C ambient). The analog switches are rated for 1 million cycles. In a typical application (sampling every 2 ms), the switches cycle 500 times per second. That’s 43 million cycles per day. The switches would wear out in hours. Wait — that can’t be right. The analog switches are not mechanical relays. They are solid-state CMOS switches. They don’t wear out. They have essentially unlimited cycle life. The MTBF is limited by the ADC and the power supply components. The FCSAG1 is a workhorse. Sixteen channels. Two milliseconds. No isolation between channels — that’s the price of density. But for monitoring pressure, level, flow, and other common signals, it’s perfect. Just respect the common return. Keep your field devices isolated. And don’t buy refurbished. The analog switches may be okay (they don’t wear out), but the calibration is likely wrong. The ADC may be a 12-bit fake. And you won’t know until the readings drift. At 2 AM. On a wastewater plant. In Florida. Ask me how I know.

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