Description
IS200TRLYS1B GE Mark VI TRLY Relay Output Terminal Board, Isolated Discrete Relay Output Card
Product Application
IS200TRLYS1B belongs to GE Speedtronic Mark VI (not Mark VIe) control system TRLY relay series. It is a field termination relay board installed in Mark VI I/O rack, interfaced with Mark VI controller via dedicated backplane connectors. It converts controller logic signals into isolated relay contact outputs for turbine protection trip signals, solenoid valves, alarm annunciators, motor control and auxiliary relay loads. It supports simplex, dual redundant and TMR triple modular redundant rack architecture for power plant gas turbine, steam turbine and combined cycle units.

IS200TRLYS1B
Product Specifications
- Part Number: IS200TRLYS1B
- Manufacturer: General Electric (GE)
- Product Type: TRLY Relay Output Terminal Board
- System Compatibility: Speedtronic Mark VI
- Relay Type: Plug-in magnetic relay, Form-C (SPDT) contacts
- Channel: 12 relay channels
- Contact Rating: 5A @ 250VAC / 30VDC
- Onboard Diagnostics: Relay coil current monitoring
- PCB: Conformal coated
- Interface: Mark VI I/O backplane connector
- Power Supply: Powered by Mark VI rack backplane
- Mounting: Rack mount inside Mark VI turbine control cabinet
- Operating Temperature: 0 ℃ ~ +60 ℃
- Storage Temperature: -30 ℃ ~ +65 ℃
- Humidity: 5% ~95% RH non-condensing
- Product Status: EOL, only new surplus / refurbished spare parts for legacy Mark VI turbine maintenance
- Approx. Weight: 0.90 kg
Core Technical Parameters
- 12 independent pluggable SPDT magnetic relays, relay modules can be individually replaced
- Galvanic isolation between control logic side and field contact side
- Built-in coil current diagnostic to detect relay coil open / fault
- Conformal coating protects PCB from dust and corrosive gas in power plant cabinet
- Supports TMR triple redundant Mark VI rack, used for critical turbine protection outputs
- MOV surge protection onboard for inductive loads such as solenoids
- Removable terminal connectors for easy field wiring maintenance
Recommended Matching Spare Parts & Accessories (8 Items)
- GE Mark VI turbine control rack & backplane
- Mark VI controller processor card
- Spare plug-in magnetic relay inserts
- Shielded discrete field cable
- Replacement terminal connectors
- GE ToolboxST diagnostic software
- Mark VI I/O terminal cables
- Other Mark VI I/O boards (TBCI, DTCI, TICI)
Product Features
✅ 12 × SPDT Plug-in Magnetic Relays Each relay is a removable insert; single faulty relay can be replaced without swapping the whole board, reducing maintenance cost.
✅ Relay Coil Health Diagnostics Onboard circuit monitors coil current to identify relay coil failure, report fault to Mark VI HMI in advance.
✅ Galvanic Isolation & Surge Protection Isolation between control rack and field wiring; MOV suppresses back EMF from solenoid and inductive loads.
✅ Conformal Coated PCB Anti-corrosion and dust resistance for power plant cabinet environment.
✅ Supports Simplex / Dual / TMR Mark VI Architecture Suitable for non-critical auxiliary control as well as triple redundant turbine protection trip circuits.
✅ Removable Field Terminal Blocks Detachable connectors allow pre-wiring and fast board replacement without re-terminating field cables.
✅ Mark VI Dedicated TRLY Series Designed for Speedtronic Mark VI, not interchangeable with Mark VIe I/O packs; S and H variants have different diagnostic functions.

IS200TRLYS1B
Installation Guidelines
- Power off Mark VI control rack and implement LOTO lockout.
- Insert IS200TRLYS1B into designated rack slot and secure board fasteners.
- Wire field loads (solenoid, alarm horn, trip relays) to removable terminal block.
- Connect backplane I/O connector to Mark VI controller backplane.
- Restore rack power, launch ToolboxST to scan board and verify relay channel detection.
- Configure each relay output logic and alarm threshold in Mark VI control database.
- Perform relay actuation test one by one and check coil diagnostic function.
- Test TMR voting logic if installed in triple redundant rack before turbine online commissioning.
Maintenance Instructions
Daily Maintenance Check board LED indicators; monitor relay channel fault alarms on Mark VI operator HMI.
Periodic Maintenance (Every 6–12 months) Clean rack air filter and PCB dust. Tighten terminal block screws. Check relay contact wear. Backup Mark VI control configuration.
Fault Maintenance
- Relay fails to actuate: Check coil diagnostic alarm, replace individual plug-in relay insert.
- Contact cannot switch load: Inspect contact aging, load overcurrent or wiring short.
- Board communication loss: Inspect backplane connector and rack power.
- Do not substitute IS200TRLYH1B in place of IS200TRLYS1B without control engineer approval, diagnostic logic differs.
Long-Term Operation Tips Maintain cabinet temperature 0~60℃. Keep spare and spare relay inserts. Archive Mark VI database backup.
Brand Same‑Series Models (6 Models)
- IS200TRLYS1B – Mark VI TRLY relay output board (coil diagnostics) (Target Model)
- IS200TRLYH1B – TRLY relay board variant (contact voltage diagnostics)
- IS230JPDGH1B – Mark VIe JPDG power distribution module
- TP202QSS RMS-9 – GE TMR turbine I/O module
- V7768-320001 A2 – 6U VME SBC
- VMIVME-4150 – VME analog output module
