The TCQA in the STCA → TCQA → TCQE Chain

Within each of the <R>, <S>, and <T> cores, the DS200TCQAG1B sits daisy-chained with the STCA network driver board on one side and the TCQE on the other. That middle position matters when investigating a fault: a problem on the STCA, which comes before the TCQA in that chain, can show up on the HMI looking exactly like a TCQA analog I/O problem. It's worth confirming the core's STCA is healthy before requesting a quote on a new TCQA.

What the Board Conditions

Besides LVDT, thermocouple, and 4-20 mA inputs, the TCQA also processes relay driver outputs and pulse inputs — used, for example, in counting and auxiliary speed signals. Each of these channels is scaled and made available to the rest of the control system from position 2 of the core.

Diagnose Before You Buy

• Confirm the fault is really analog I/O, not communications — problems on the STCA or the core's network cabling often show up looking like a TCQA failure.
• Compare the suspect channel across all three cores: an isolated mismatch in just one core points to that specific hardware; a mismatch across all three points to the sensor or the terminal board.
• Note the board revisions installed in <R>, <S>, and <T> before ordering the part — mixing different revisions within the same voted set is a classic cause of intermittent trips.

Reading the Part Number

DS200TCQAG1B is the base; DS200TCQAG1BHF is the full revision stamped on the physical label. Provide the complete code, with suffix, when requesting a quote.

This Unit

Used, cleaned and tested, with a 1-year warranty.

Details for Your Quote

• Full part number with suffix (photo of the label)
• Affected core and the revisions of the other two cores
• Mark V Simplex or TMR
• Whether you need a single board or a complete set
• Urgency

Request a quote through Request a Quote: response within 24 hours, worldwide DDP dispatch, purchase orders accepted.

• GE Mark V DS200 boards explained
• GE Speedtronic part number decoder