Description   Product Introduction The GE IS200DRLYH1A is a Mark VIe series digital output module that provides 16 channels of relay outputs for switching field devices in gas and steam turbine control applications. This I/O pack interfaces with solenoids, motor starters, alarm annunciators, indicator lights, and other discrete field devices requiring dry contact outputs. It is the relay output counterpart to the solid-state DIO series, offering galvanic isolation for each channel. The H1A revision provides 16 form-A (SPST) normally-open relay contacts, each rated for 2 A at 250 V AC or 30 V DC. The module includes per-channel status LEDs for immediate visual feedback of output states. In our field experience, the DRLYH series is used extensively for valve solenoid control and alarm circuits where the contact rating and isolation are critical. For facilities needing to switch AC or high-current DC loads, the DRLYH series is the appropriate choice. The relays are socketed on the board for replacement, extending module life.   Key Technical Specifications Parameter Value Model Number IS200DRLYH1A Series Mark VIe IS200 Hardware Revision H1A Number of Outputs 16 digital output channels Output Type Form-A (SPST) normally-open relay contacts Contact Rating 2 A resistive at 250 V AC or 30 V DC Contact Material Silver alloy, gold-plated (for low-level switching) Minimum Load 10 mA at 5 V DC (for contact wetting) Coil Voltage 24 V DC (from backplane) Response Time 10 ms typical (pick up and drop out) Contact Life 100,000 cycles at rated load, 10 million cycles at low load Isolation 2,500 V AC channel-to-backplane, 2,500 V AC channel-to-channel Diagnostics Output state feedback, coil fault detection Operating Temperature −30°C to 65°C (ambient, with 0.5 m/s airflow) Power Supply 24 V DC from backplane (coils), 5 V DC logic Bus Interface VME-based high-speed parallel bus Termination Board Compatibility TS200DRY1, TS200DRY2 LED Indicators Per-channel output state, power, module fault Socketed Relays Yes (field replaceable without soldering)   Key Selling Points & Differentiators 16 channels of dry relay contacts – provides galvanic isolation for each output. Suitable for switching AC and DC loads up to 2 A. Socketed, replaceable relays – relays are plug-in type on the PCB. If a contact fails, you can replace the individual relay without replacing the entire module. Saves significant cost over time. 2 A contact rating at 250 V AC – suitable for solenoid valves, motor starters, and alarm circuits. Supports both AC and DC field devices. Per-channel status LEDs – each output has a dedicated LED for immediate visual feedback. Field technicians can verify outputs without software. Rigorous 48-hour burn-in – each unit cycles all 16 relays at 1 Hz with resistive load. We catch intermittent contact failures that standard testing misses. 3-year warranty on hardware – backed by our in-house repair depot with average 48-hour turnaround. Dedicated DRLYH swap-pool ensures rapid replacement.   Frequently Asked Questions (FAQ) Can I hot-swap this IS200DRLYH1A into a running Mark VIe system? We strongly advise against it. The DRLYH series has shown unpredictable behavior when inserted into a powered backplane due to the relay coil inrush currents. Schedule a controlled outage, de-energize the rack, and swap it during planned maintenance. What is the maximum switching voltage and current? The contacts are rated for 2 A at 250 V AC or 30 V DC. Do not exceed these ratings. For inductive loads (solenoids, contactors), derate by 40% – we recommend 1.2 A maximum. The contacts are not designed for high-current DC breaking – for DC loads above 1 A, consider adding an external contactor or solid-state relay. What is the minimum load requirement? The contacts require a minimum wetting current of 10 mA at 5 V DC to maintain reliable contact resistance. Switching very low-level signals (<10 mA) can cause contact oxidation over time. For dry signal switching (e.g., PLC inputs), consider adding a pull-up resistor to meet the minimum load requirement. Are the relays field replaceable? Yes. The relays are socketed and can be replaced with standard Mini-DIP relay types (available from GE or aftermarket suppliers). This is a significant advantage over hard-soldered relay modules – you can replace a single failed contact without replacing the entire I/O pack. How long do the relays last? Contact life depends on load. At rated load (2 A resistive), expect 100,000 cycles. At low loads (<100 mA), expect 10 million cycles. We have seen these modules exceed 15 years in service with typical valve solenoid applications. The socketed relays are rated for 10 million mechanical cycles. Can I use this module for DC motor starters? The 2 A rating is sufficient for small DC motor contactors, but for larger motors, use the DRLYH output to energize an external contactor or starter. The module’s relay contacts should only switch the coil current of the starter (typically <1 A), not the motor power itself. What happens if a field output is shorted? The relay contacts are protected by a low-value series resistor, but sustained short circuits above 2 A will damage the contacts or PCB traces. The module does not have individual output fuses – ensure your field wiring includes appropriate protection (e.g., fuse or circuit breaker) for each output. How do I verify this is a genuine GE module? We source exclusively from GE-authorized liquidations. Our verification includes OEM packaging inspection, serial number cross-check against GE records, and PCB inspection for GE-specific markings. We test all 16 relay contacts for contact resistance and timing. We provide PCB photographs upon request. Will I lose any configuration data when I replace the module? Relay output modules have no user-configurable parameters stored locally. Once you install the replacement module, the controller will recognize it and resume controlling the outputs. No calibration or configuration is required. What is the expected lifespan of this unit? We see MTBF around 120,000 hours for the DRLYH series excluding relay wear. The relay coils are the primary wear component. With typical valve solenoid switching (10-50 operations per day), expect 8-12 years of service before relay replacement is needed. What happens if the module fails within the warranty period? We cross-ship a tested replacement from our dedicated DRLYH swap-pool the same business day. You return the failed unit within 15 days. Our repair depot has an average 48-hour turnaround. No restocking fees. You receive a DRLYH replacement. Which termination board should I use with this module? The IS200DRLYH1A mates with GE’s TS200DRY1 or TS200DRY2 termination boards. Check ribbon cable orientation; pin 1 has a red stripe. We include a wiring diagram PDF with every order. 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