GE IS200DRLYH1BBB Simplex Relay Output Terminal Board

The IS200DRLYH1BBB is a simplex relay output terminal board from GE Industrial Systems, part of the DRLY series. This compact, wall‑mountable board provides 12 form‑C dry contact output relays and is designed to interface directly with VCCC, VCRC, or VTUR processor boards via a single 37‑pin D‑sub cable. The IS200DRLYH1BBB is the H1B variant, which is specifically suitable for use in UL Listed Class I, Division 2 hazardous (classified) locations. Its smaller physical footprint and simplified feature set make it an ideal choice for applications where space is limited and high‑density relay outputs are required.

Unlike the larger TRLY terminal board, the DRLY series does not include on‑board surge suppression or relay state monitoring. However, it offers clear visual diagnostics through green and yellow LEDs, and its dry contact outputs provide reliable switching for a wide range of industrial control loads. Two DRLY boards can be connected to a single VCCC, VCRC, or VTUR board, providing up to 24 contact outputs. Note that the DRLY board is not compatible with the PDOA I/O pack.

Functional Description

The IS200DRLYH1BBB acts as a simple, robust relay output expansion for GE Mark VI turbine control systems and other industrial controllers. The terminal board receives 28 V dc power for its relay coils directly from the connected I/O board (VCCC, VCRC, or VTUR). The I/O board controls each relay individually by applying or removing the coil voltage. Each relay output is a form‑C (changeover) dry contact, meaning it provides both normally open (NO) and normally closed (NC) contacts, with a common (COM) terminal.

Key features of the IS200DRLYH1BBB include:

• 12 independent relay outputs – Each relay is a two‑pole double‑throw device, offering two NO and two NC contacts per relay (only one set of NO/NC/COM is brought out to the terminal blocks; the second pole is not used).

• Dry contact design – No external power is supplied through the board; the user provides the load power separately. This allows switching of AC or DC loads up to the rated limits.

• LED indication – A green LED at the top of the board indicates that 28 V dc coil power is present. A yellow LED adjacent to each relay illuminates when voltage is applied to that relay’s coil, providing a clear visual indication of the commanded state.

• No on‑board suppression – Unlike the TRLY board, the IS200DRLYH1BBB does not include internal snubbers or flyback diodes. The customer must supply external suppression (e.g., MOVs, diodes, or RC networks) when switching inductive loads.

• No relay state monitoring – The I/O board does not read back the actual contact state; diagnostic coverage is limited to coil voltage presence.

• Wall mounting – The board is not designed for DIN rail mounting. It is secured via four corner mounting holes on a metal support plate.

The board connects to the I/O processor board (VCCC, VCRC, or VTUR) via a 37‑pin D‑sub cable. The connector is identical to that used on the larger TRLY board, allowing cable commonality. When the control cable is disconnected, all relays default to the de‑energized state (COM connected to NC).

Hardware Characteristics

Physical Dimensions and Mounting

• Length: 21.59 cm (8.5 inches)

• Width: 20.57 cm (8.1 inches)

• Mounting: Wall mounting using four screws through the corner holes of the metal support plate. The board does not have a shield terminal strip.

• Connectors:

  • 37‑pin D‑sub female connector – Receives the control cable from the I/O board (J3 or J4 on VCCC/VCRC/VTUR).

  • Terminal blocks (TB1 and TB2) – High‑density Euro‑block type pluggable terminals. TB1 provides the screw connections for the 12 relay outputs (odd‑numbered screws for each relay’s NO, NC, COM). TB2 provides two screws for SCOM (chassis ground) connection, which must be connected to chassis ground with the shortest possible lead length.

Relay Output Wiring

Each relay output is accessible via three terminals on TB1:

• NC (normally closed) – contact closed when relay is de‑energized.

• COM (common) – moving contact.

• NO (normally open) – contact closed when relay is energized.

The wiring should be done using the odd‑numbered screws as indicated in the board’s labeling. There is no shield terminal strip, so shielded cables must be grounded at the source end.

LED Indicators

Installation Instructions

Mounting

1. Select a clean, dry, vibration‑free location on a wall or panel. The board is not designed for DIN rail mounting.

2. Use the four mounting holes at the corners of the metal support plate to secure the board with appropriate screws. Ensure the board is firmly attached.

Grounding

• TB2 (SCOM) must be connected to chassis ground using the two screws. Keep the grounding lead as short as possible to minimize noise and ensure proper operation. Failure to connect SCOM may result in erratic relay behavior or electrical noise issues.

Wiring Relay Outputs

• Connect the field wiring to the odd‑numbered screws on terminal block TB1. Each relay has three terminals (typically marked as NC, COM, NO). Refer to the board’s silk screen or the wiring diagram in the attached document.

• Use appropriate wire gauges for the load current (up to 2 A dc or 1 A rms). The terminal blocks accept solid or stranded conductors up to 2.5 mm² (approximately 12 AWG).

• For inductive loads (relays, solenoids, motors), external suppression devices must be installed by the customer. Failure to provide suppression may cause contact welding or excessive electrical noise.

Connecting to the I/O Board

• Connect a 37‑pin D‑sub cable (identical to TRLY cables) from the I/O board’s J3 or J4 connector to the DRLY board’s 37‑pin female connector. Ensure the cable is securely latched.

• If using two DRLY boards, connect each to a separate port on the I/O board (e.g., J3 and J4). The I/O board firmware will automatically recognize the boards via their ID chips.

Power‑Up and Verification

• Apply power to the I/O board. The green P28 OK LED on the DRLY should illuminate, indicating that 28 V dc is present for the relay coils.

• Through the control system software, command each relay on and off. Observe the corresponding yellow LED for each relay (K1 through K12). The LED should turn on when the relay is commanded on and off when commanded off.

• Note that the yellow LED indicates coil voltage, not contact closure. To verify actual contact switching, use a multimeter across the NO/COM or NC/COM terminals.

Diagnostics and Troubleshooting

The IS200DRLYH1BBB provides basic diagnostics through its LEDs and an on‑board ID chip. Because there is no relay state monitoring, the I/O board cannot detect if a contact has failed to close or has welded.

Configuration

The IS200DRLYH1BBB contains no jumpers, dip switches, or any user‑configurable hardware settings. All configuration is performed in the control system software (e.g., ToolboxST) on the connected I/O board. The I/O board automatically enumerates the DRLY board via the ID chip and assigns output points accordingly.

Ordering Information

When ordering the IS200DRLYH1BBB, use the full part number exactly as shown. The part number follows GE’s convention:

• IS200 – Innovation Series, 200V class

• DRLY – Functional acronym: Simplex Relay Output terminal board

• H1 – Generation/version

• B – H1B variant (Class I, Div. 2 certified, lower contact rating)

• B – Additional modifier (e.g., coating or termination)

• B – Revision B

Warranty and Order Placement

• Warranty replacements (within warranty period): Contact GE Industrial Control Systems Product Service Engineering directly:
  GE Industrial Control Systems
  Product Service Engineering
  1501 Roanoke Blvd.
  Salem, VA 24153‑6492 USA
  Phone: +1‑540‑387‑7595
  Fax: +1‑540‑387‑8606

• Spare parts or non‑warranty orders: Contact your nearest GE Sales or Service Office. Provide:

  • Complete part number: IS200DRLYH1BBB

  • Drive or turbine control system serial number

Note: All digits in the part number are important. GE may substitute later compatible revisions, but backward compatibility is assured.

Handling and Storage Precautions

• Static sensitivity – The board contains static‑sensitive components (ID chip, relays with semiconductor drivers). Handle using a grounded wrist strap and store in an antistatic bag.

• Mechanical stress – Do not bend or flex the board. Handle by the edges or the metal support plate.

• Moisture – Keep the board dry. If condensation is possible, allow the board to acclimate before installation.

• Shipping – Use original GE packaging or an equivalent antistatic, cushioned container.

Compatibility Notes

• The IS200DRLYH1BBB is only compatible with VCCC, VCRC, and VTUR processor boards. It does not work with the PDOA I/O pack.

• When used with VTUR, the DTRT transition board is required to control up to three relays. With two DTURs, up to six relays can be controlled.

• Two DRLY boards can be connected to a single I/O board for a total of 24 relay outputs.

• The board is not DIN rail mountable; it must be wall mounted.

• There is no shield terminal strip – use cable shielding practices at the source.

Environmental and Agency Compliance

• Temperature range: 0°C to 75°C (32°F to 167°F) – wider than the H1A version (0‑60°C).

• Hazardous locations: UL listed for Class I, Division 2, Groups A, B, C, D hazardous (classified) locations.

• Certifications: UL, CSA, CE. Relay contacts are UL listed and CSA certified, sealed to UL 1604.