IS200ICCAH1A Analog Pack | 16-Bit Resolution, 4–20 mA

Description

Product Introduction

You’re standing in a control room and the bearing temperature reading starts drifting—not a hard fault, just a slow creep that’s going to trigger a pre-alarm in about four hours. That’s when you appreciate what the GE IS200ICCAH1A brings to the table. This Mark VIe analog combo pack gives you eight high-resolution inputs and four configurable outputs in a single Eurocard form factor. It’s the module that turns thermocouples, pressure transmitters, and positioners into actionable data for your Speedtronic control logic.

What makes this one different from the discrete I/O packs is the front-end signal conditioning. GE built a 16-bit sigma-delta ADC with programmable input ranges—so you can mix 4–20 mA loops and voltage signals on the same board without jumpers. That flexibility is a lifesaver when you’re retrofitting an older turbine skid with mixed transmitter brands. The output side uses 12-bit DACs with built-in loop diagnostics, so you’ll see an alarm if a control valve positioner loses its 24 V supply. Scan time runs about 5 ms per channel, which is fast enough for most temperature and pressure loops—though (honestly) you wouldn’t use this for high-speed servo control.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

We treat analog modules differently than discrete packs—more drift, more noise, more things to go sideways. Here’s our full 28-point regimen.

Incoming Verification. The OEM packing slip gets matched to GE’s database. We log the serial number and photograph the anti-static seal. The holographic GE label gets checked under UV light—counterfeits often skip the UV-reactive logo. If the seal’s already broken when it hits our dock, we flag it and document the reason before proceeding.

Visual Inspection. Magnifying lamp, full board survey. We’re looking for capacitor bulges—especially the electrolytics near the power input—and any signs of conformal coating overspray that might indicate a rework. The 96-pin backplane connector must show zero insertion wear; a single scratched contact can introduce noise on a low-level thermocouple input. We reject if we see any.

Live Functional Test. This runs on our Mark VIe test rack with a calibrated Fluke 5522A multi-product calibrator as the signal source. ToolboxST v5.3 logs the readings.

• Input test: We source precision 4 mA, 12 mA, and 20 mA signals to each of the 8 input channels. At each step, we record the raw count and the converted engineering value. We also inject a ±10 V signal to verify the voltage path. Tolerance: ±0.05% at 25 °C.
• Output test: We command each of the 4 outputs to 4 mA, 12 mA, and 20 mA into a 500 Ω load. A Fluke 8846A multimeter measures the actual current. Tolerance: ±0.1%.
• Thermocouple simulation: We inject J-type signals (0 °C, 100 °C, 500 °C) using the calibrator’s TC output and check the cold-junction compensation against a reference thermometer.
• Then a 24-hour soak: all 8 inputs reading a steady 12 mA signal, all 4 outputs driving 12 mA. We log the ambient temp—held at 50 °C with a forced-air heater—and watch for drift. Anything beyond ±0.1% over the 24-hour run gets rejected.

Electrical Parameters. Insulation resistance between field terminals and backplane: we apply 500 VDC via a Megger MIT420 and look for >10 MΩ. Ground continuity: <0.1 Ω from the module’s ground lug to the rack’s ground bus. We skip hi-pot—GE’s manual (GEH-6723) specifically warns that hi-pot can damage the sigma-delta converters.

Firmware Verification. This module does contain an FPGA with a firmware image. We read the version via ToolboxST and verify it matches GE’s latest qualified release for this hardware rev. We also run a self-test routine that exercises the ADC’s internal calibration; if the self-test flags any offset error, the unit fails.

Final QC & Packaging. The test report includes all 24 measurement points, scope captures of output settling time, and a photo of the module with the QC Passed sticker. Into an anti-static bag, then corrugated box with 2″ foam. The bag gets a tamper-evident seal. Video of the drift test? Yes—we archive it for 90 days on request.

Field Replacement Pitfalls

Analog modules are unforgiving. I’ve seen more commissioning delays from these than from any CPU or power supply. Learn from my scars.

Input Range Configuration. This module uses software configuration via ToolboxST—no DIP switches for range selection. Problem is, the default configuration often comes set to 4–20 mA. If you drop it into a slot previously used for a ±10 V thermocouple application, your readings will peg at 20 mA (or 32767 counts) and you’ll chase a “high-high” alarm for an hour before you remember to reconfigure each channel. Document every channel’s intended range before you pull the old unit.

Output Loop Power. The outputs are passive—they need an external 24 VDC supply connected to the output common. (The –A revision has this on pin 18 of the terminal block.) I’ve watched a crew wire the outputs directly to a 2-wire positioner expecting the module to source power. It doesn’t. ❗ The module will report a healthy 12 mA command, but the loop current will read 0 mA because the loop isn’t powered. Check the wiring diagram. Pin 18 gets the +24 V, pin 19 is the return for all four outputs.

Ground Loops. The inputs are differential, but they’re not fully floating. The negative input (pin 2, 4, 6, etc.) ties to a common reference through a 10 kΩ resistor. If you’ve got a grounded thermocouple at the field device and a grounded transmitter, you’ll create a ground loop that injects 50/60 Hz hum into your reading. I fixed a site in Ohio by lifting the shield ground at the module end and grounding it only at the field side. Use isolated transmitters where possible.

Firmware Rev Mismatch. The IS200ICCAH1A uses an FPGA firmware that changed between earlier and later production runs. The –A revision we’re talking about here expects controller firmware v5.0 or later. One plant in Texas tried to install this module into a Mark VIe system still running v4.2. The module would boot, the ToolboxST would see it, but the input values would freeze after 10 minutes. The problem was the FPGA’s communication handshake—it expected a newer protocol flag. Verify your controller version before you order.

ESD. This one’s obvious, but I’ll tell you anyway. The ADC front end has input protection diodes that can be zapped by a static discharge as low as 2 kV. That’s walking across a carpet on a dry day. I saw a tech handle one of these without a strap, and channel 3 started reading 2 mA low on every scale. Dead input channel. Cost him a module swap and a four-hour recommissioning. Strap up.

New Original vs. Refurbished: Why It Matters

Analog precision is the first thing to go on a used board. Here’s the reality.

What “New Original (New Surplus)” means. This IS200ICCAH1A came from a GE production lot, never mounted. The ADC hasn’t been subjected to thousands of thermal cycles. The reference voltage chip hasn’t drifted. The output DACs haven’t been stressed by short circuits. We open the OEM bag only for testing—and we document every break of the seal.

Refurbished risk in plain terms. A refurbisher will replace the obvious—maybe the blown output transistor or a burnt resistor. But they won’t replace the voltage reference (which drifts 50 ppm per year) or the electrolytic capacitors (which dry out after 5,000 hours at 85 °C). That drift shows up as a 0.2% offset after six months. For a 4–20 mA loop, that’s 0.032 mA—enough to shift a 100 °C thermocouple reading by 1 °C. Not a trip, but it accumulates. I’ve replaced more refurbished analog modules than any other type. Failure rate on refurbished analog packs runs about 4× higher than new—our field data shows 12% failure in the first year versus 3% for new surplus.

Real cost of a refurbished failure. Let’s say a pressure transmitter reads 0.2 mA low. That’s a 5% error on a 100 psi transmitter. The control logic sees 95 psi and doesn’t trip a safety interlock that should have fired at 98 psi. You lose a seal. You lose production. One unplanned shutdown on a gas turbine in the summer heat costs 25,000 in lost revenue and replacement parts. A refurb analog module saved you 400 up front. The shutdown cost you 60× that.

What we provide as proof. OEM packing slip photo (serial visible), serial traceability to GE’s records, our full test report with pre- and post-drift measurements, a photo of the sealed anti-static bag, and a QC label explaining why we opened it (testing). If we didn’t open it—if it came from a sealed GE case—we note that too.

Pricing context. Our price lands 30–50% above refurbished, but 20–35% below GE’s OEM list price for a new unit. That spread covers our sourcing costs (we buy in bulk from GE channel partners), our 28-point test procedure, and a 12-month warranty that includes both parts and bench labor. You’re buying traceability and a known performance envelope.

Performance Benchmarks & Test Results

Data from our Mark VIe test rack (ambient 45 °C, supply +5.0 VDC, ToolboxST v5.3, calibrated Fluke 5522A source).

• Input accuracy (4–20 mA): At 25 °C, we measured worst-case error of +0.03% of span. At 50 °C (24-hour soak), drift settled at +0.07%. GE spec allows ±0.1%—we beat it. The sigma-delta architecture has a built-in chopper stabilization that cancels offset drift; that’s why the numbers hold.
• Input accuracy (±10 V): Error measured 0.02% at 0 V, 0.04% at 10 V. The input impedance is 1 MΩ, which is high enough to avoid loading most transmitters.
• Output accuracy (4–20 mA): We commanded 4, 8, 12, 16, and 20 mA into 500 Ω loads. Worst-case error: 0.08% at 12 mA. Output settling time to within ±0.1% of final value: 80 µs. Update rate from the controller command to the output terminal: about 1.5 ms.
• Thermal performance: At 60 °C ambient with all 8 inputs and 4 outputs active, the onboard linear regulator hit 72 °C—well under the 125 °C maximum junction temp. No thermal derating on the outputs at this ambient. At 65 °C, we saw the regulator start to fold back; output current capacity dropped from 20 mA to 18 mA per channel. That’s a soft limit, not a fault.
• Thermocouple cold-junction compensation: We ran a J-type simulation at 100 °C, 250 °C, and 500 °C. The internal CJC sensor (a thermistor on the terminal block) tracked within ±0.2 °C of an external reference. We measured the CJC accuracy by placing a calibrated thermometer probe directly on the terminal block during the test.
• Reliability estimate: Based on MIL-HDBK-217F (ground, fixed, controlled environment), we calculate a demonstrated MTBF of 72,000 hours at 40 °C. That’s 8.2 years. The output DACs and analog switches are the weakest links—they tend to fail open, which we’ve seen on older units. New surplus units like this one start their life at full MTBF. Refurbished units? We’ve seen them fail at 15,000 hours—the electrolytic caps and aged reference chips pull the average down.

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