The IS200TBTCH1CBB is a Thermocouple Input Terminal Board from GE’s Mark VIe series. GE designed this board for distributed turbine control systems. It accepts up to 24 thermocouple inputs. These include types E, J, K, S, and T. The board communicates with I/O packs through DC-type connectors. You can use it in simplex, dual, or triple modular redundancy (TMR) systems.
This board provides 24 thermocouple channels. Each channel accepts grounded or ungrounded thermocouples. The input span ranges from -8 mV to +45 mV. Therefore, it covers a wide variety of temperature measurements. Thermocouples can be installed up to 300 meters from the control panel. Maximum two-way cable resistance is 450 ohms.
The IS200TBTCH1CBB works with five common thermocouple types:
Type E
Type J
Type K
Type S
Type T
Each type has its own linearization curve. The I/O processor handles analog-to-digital conversion. It also performs thermocouple linearization automatically.
Two cold junction reference devices sit on the board. Their signals are available for monitoring. The system normally uses the average of both CJ readings. A 1°F error in CJ compensation causes a 1°F error in the temperature reading. Hard-coded limits are set at -40 to 85°C. If a CJ goes outside these limits, the system flags it as faulted. Most CJ failures are open or short circuits. When a CJ fails, the backup value takes over. You can derive this backup from other boards or use a configured default.
High-frequency noise suppression is built into the board. This feature improves signal quality. It also enhances system reliability in electrically noisy environments.
For simplex systems, use the IS200TBTCH1CBB with two PTCC I/O packs. Both packs plug into the board. Together they process all 24 thermocouple inputs. Two DC-type connectors handle communication.
In TMR systems, thermocouple signals distribute across six DC-type connectors. These connectors are labeled JTA, JTB, JSA, JSB, JRA, and JRB. Each of three I/O processors receives 12 inputs. This setup maintains full redundancy. Note that total inputs drop to 12 per processor.
Dual systems offer a middle ground. One, two, or three PTCC packs can plug into the board. Configuration flexibility allows you to match reliability needs with budget constraints.
Dimensions: 15.9 cm high x 17.8 cm wide
Operating Temperature: 0 to +45°C
Country of Origin: USA
PCB Coating: Conformal coating
Manual Reference: GEH-6421M
First, mount the IS200TBTCH1CBB inside the turbine control panel. Ensure adequate airflow for cooling.
Next, connect thermocouples to the two I/O terminal blocks. Each block has 24 terminals. Use wires up to #12 AWG. Secure each terminal block with two screws.
Then, connect the shield terminal strip to chassis ground. This strip sits on the left side of each block. Proper grounding reduces electrical noise.
After wiring thermocouples, plug in the PTCC I/O packs. For simplex systems, use two packs. For TMR systems, connect three packs using all six J-type connectors.
Finally, apply power and verify communication. Check cold junction readings. Confirm that all 24 channels report correctly.
The system supports thermocouple inputs from -8.0 mV to +45.0 mV full scale. Voltage output is proportional to the temperature difference between the measurement point and the cold junction. The cold junction reference range is -30°C to 65°C.
Three LEDs on the board faceplate provide status information. They indicate normal operation or fault conditions. The conformal coating protects all components from moisture and dust.
IS200TBTCH1CBB board – 1 unit
Anti-static bag – 1 piece
Foam padding – 1 set
Cardboard box – 1 piece
1. How many thermocouple channels does the IS200TBTCH1CBB support?
The IS200TBTCH1CBB supports 24 thermocouple channels. These can be type E, J, K, S, or T.
2. Can I use this board in a TMR system?
Yes, in TMR systems you connect three I/O processors. However, each processor only accesses 12 inputs.
3. What happens if a cold junction reference fails?
The system flags it as faulted. It then uses a backup value from another board or a configured default.
4. What shipping methods are available?
We ship via FedEx, UPS, and DHL. All items are packed in anti-static bags with foam padding.
5. Does this board require conformal coating?
The IS200TBTCH1CBB comes with factory-applied conformal coating. This protects against moisture and contamination.
| Brand Name | General Electric |
| Model No. | IS200TBTCH1CBB |
| Product Type | Thermocouple Input Terminal Board |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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