Description
It serves as the physical interface layer where field-mounted temperature sensors terminate their signals before processing.
Commercial and Supply Chain Status
- Condition: New Original, New Surplus, or Refurbished (Fully Inspected on Core Automation Validation Racks)
- Warranty: 12-Month Comprehensive Industrial Warranty
- Availability: Stock available through specialized power-generation and turbine-control component pipelines
- Lead Time: Ships within 2 to 4 business days from order verification
- Pricing: Pricing follows standard lifecycle scaling for specialized Speedtronic hardware; contact us for a firm quote.
Technical Specifications
| Parameter | Value |
| Manufacturer | General Electric (GE) |
| System Platform | Mark VI / Mark VIe Speedtronic Control Solutions |
| Part Number | IS200SRTDH1ABB |
| Functional Board Type | SRTD (Simplex RTD Terminal Board) |
| Channel Capacity | Supports up to 8 independent RTD inputs |
| Terminal Block Layout | H1 Configuration: Features a permanently mounted, high-density 36-pin Euro-block terminal assembly |
| Excitation Sourcing | 10 mA DC multiplexed (non-continuous) excitation per channel |
| Maximum Loop Resistance | 15 \Omega maximum two-way cable resistance |
| Compatible I/O Packs | Connects to PRTD or VRTD I/O processors via custom ribbon cables |
| Hardware Suffix Revision | H1ABB (Denotes structural artwork revision and backward-compatible manufacturing components) |
Functional Architecture and Sensor Linearization
The IS200SRTDH1ABB simplifies cabinet architecture by mapping field temperature tracking elements directly onto the controller framework without requiring external isolation or transmitter modules.
- Multiplexed Sensor Excitation: To prevent self-heating errors in delicate RTD elements (which can skew precision readouts), the terminal board delivers a 10 mA DC multiplexed excitation current. The line pulses each sensor sequentially rather than running continuous current down the loops.
- Simplex Operation Framework: Engineered for non-fault-tolerant (Simplex) control architectures, the board concentrates 8 fields loops onto a single ribbon connection block leading back to the active PRTD/VRTD I/O pack.
- Software-Driven Linearization: Rather than altering the hardware components for differing sensors, linearization is executed digitally inside the companion I/O processor. The system natively accommodates up to 15 different pre-coded RTD standards—including standard 100\ \Omega Platinum (Pt100, \alpha=0.00385 or 0.00392), Copper (10\ \Omega), and Nickel (120\ \Omega) elements.
Engineering Insights: Installation and Maintenance
Hardware Variant Differentiation (H1 vs. H2)
When planning a replacement module deployment, remember that the H1 designation in SRTDH1 means the unit has a permanently soldered Euro-style terminal block casing on the printed circuit board. This distinguishes it from the SRTDH2 variant, which features a right-angle pin header designed for removable, pluggable block assemblies. Verify your cabinet’s field wiring slack and label configuration before ordering to ensure correct fitment.
Noise Mitigation and Shielding Layouts
Because the millivolt variations returned across long RTD runs are highly susceptible to electromagnetic interference (EMI):
- Utilize high-quality shielded twisted-pair (STP) cabling (typically #18 AWG) for all sensor runs.
- Ground the cable drains exclusively at the master terminal enclosure ground bar using an external grounding clip assembly.
- Avoid grounding the shield at both ends to prevent creating ground loops that distort temperature readings.
Fault Analysis and Hot Reinstatement
The board possesses an integrated electronic ID chip that transmits layout parameters and revision verification to the primary I/O pack.
- Diagnostics: Sensor line open-circuits or dead shorts are flagged by out-of-range ADC limits.
- If a channel breaks hardware boundary checks, the I/O processor isolates it from the master scan table to prevent cross-channel interference.
- Once the field wire fault or loose screw connection is corrected, the channel automatically reinstates itself into the system processing loop within 20 seconds.
Frequently Asked Questions
Q: Can this terminal board be used directly inside redundant (TMR) control systems? A: No. The SRTD line is a dedicated Simplex board configuration with one cable path leading to a single I/O pack. For Triple Modular Redundant (TMR) temperature loops requiring voting architecture, you must deploy the TRTD terminal board variant instead.
Q: What do a series of overlapping “RTD Open Circuit” alarms on the ToolboxST dashboard indicate? A: If multiple channels fault simultaneously, it typically indicates a loose internal power ribbon cable connection, or a detached common reference line rather than multiple independent sensor failures. Inspect the ribbon seating between the terminal board and the I/O pack and check the input supply rails.
Q: Is it necessary to recalibrate this hardware board following a standard component swap? A: No. The IS200SRTDH1ABB relies on fixed precision resistors and digital tracking loops on the primary processor pack. Replacing the board does not require manual component trimming or software-based calibration steps in ToolboxST, provided the channel mapping choices inside your project file match the sensor types in the field.
