SPECIFICATIONS
Part No.: IS230STCIH2A
Manufacturer: General Electric
Product Type: Contact Input Module
Size: 15.9 cm high x 10.2 cm wide
Temperature -30 to + 65ºC
Technology: Surface-mount
Country of Manufacture: United States (USA)
Availability: In Stock
Series: Mark VIe
Functional Description
IS230STCIH2A is a Contact Input Module developed by GE. It is a part of Mark VIe control system. The Simplex Contact Input terminal board is a DIN-rail or flat-mounting contact input terminal board. The STCI board accepts 24 contact inputs with nominal excitation voltages of 24, 48, and 125 V dc from an external source. To protect against surge and high-frequency noise, the contact inputs have noise suppression. The STCI is compatible with the Mark VIe and Mark VIeS systems.
Operation
- Operation of this system involves functions and on-board signal conditioning similar to those on the TBCI model. However, the system is scaled to accommodate 24 V, 48 V, and 125 V DC excitation levels, with each input excitation falling into one of the following ranges: 16–32 V DC, 32–64 V DC, and 100–145 V DC. The system operates with a threshold voltage set to 50% of the excitation voltage.
- The contact sensing circuits, illustrated in the accompanying figure, show that input currents are restricted by resistors to 2.5 mA for circuits 1–21, while circuits 22–24 have their current limited to 10 mA. Additionally, a 24 V DC power supply is provided, with current limited to 0.5 A using resettable polymer positive temperature coefficient (PTC) fuses. These fuses protect against overcurrent conditions by reducing current flow as they heat up and reset once cooled.
- High-frequency noise and voltage surges are suppressed on each input close to the entry point of the signal to ensure signal integrity. After noise suppression, the discrete input voltage signals are sent to the I/O processor. Here, they are passed through optical isolators for isolation, converted into digital signals, and then transferred to the main controller for further processing.
Installation
- The STCI, along with a plastic insulator, is mounted on a sheet metal carrier, which is then mounted on a DIN rail. The STCI plus insulator can be mounted on a sheet metal assembly that is then bolted into a cabinet. The contact inputs are typically wired directly to the terminal block with 18 AWG wires.
- Shields should be terminated with their own bracket. It have a right-angle header with 52 terminals that accept a variety of commercially available pluggable terminal blocks.
Product Attributes
- Number of channels: 24 dry contact voltage input channels
- Excitation voltage: Nominal 24 V dc, floating, ranging from 18.5 to 32 V dc (Pluggable TB)
- Input Current: For 24 V dc applications-First 21 circuits draw 2.5 mA, Last three circuits draw 10 mA
- Input filter: Hardware filter, 4 ms
- Fault detection in I/O board: Loss of contact input excitation voltage, Non-responding contact input in test mode
Diagnostics
- Contact Excitation Voltage Monitoring: The system checks the contact excitation voltage level, and if it drops below 40% of the expected nominal voltage, a diagnostic alarm (fault) is triggered and latched, indicating a potential issue with power supply stability or input integrity.
- Input Diagnostic Test: To verify input functionality, the system periodically forces all associated inputs to the open contact state as a test. Inputs that fail to respond correctly to this test are forced into a failsafe open state and generate a fault, helping prevent misoperation due to faulty inputs.
- Terminal Board Connector ID Verification: Each terminal board connector includes an ID device with a read-only chip that stores its serial number, type, and revision number. The I/O processor interrogates this ID to verify compatibility. If a mismatch is detected, indicating a potential hardware incompatibility, the system registers a fault for corrective action.
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Frequently Asked Questions
What is IS230STCIH2A?
It is a Contact Input Module developed by GE.
What is the purpose of STCI board?
It is designed to provide a means of inputting contact signals into a control system. The board's contact inputs are equipped with noise suppression to protect against surge and high-frequency noise.
What systems is the board compatible with?
It is compatible with the Mark VIe and Mark VIeS control systems.
How does the board condition the input signals?
The function and on-board signal conditioning of the board are identical to those found on the TBCI, but they are scaled for 24, 48, and 125 V DC excitation.
What is the maximum input current for the contact inputs?
Contact input currents are limited by resistance to 2.5 mA on the first 21 circuits and 10 mA on circuits 22-24.
How is the 24 V DC supply protected?
The 24 V DC supply is current-limited to 0.5 A by resetting polymer positive temperature coefficient fuses. Filters at each input near the point of signal entry reduce high-frequency noise and suppress surge.
