Description
GE IS410SRLYS2A / IS400SRLYS2ABB Product Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Mark VIeS Terminal Board | |
| Board Designation | IS400SRLYS2A |
| Output Type | Form-C relay contact |
| Number of Outputs | 12 |
| Configuration | Simplex |
| Customer Terminals | 48 |
| Compatible I/O Pack | IS420YDOAS1B |
| Contact Rating | 0.6 A @ 125 VDC; 1.2 A @ 48 VDC; 2.25 A @ 24 VDC; 2.25 A @ 120/240 VAC |
| I/O Pack Control Power | 24/28 VDC, 19.8 W maximum |
| Operating Temperature | -40 to +70°C |
| Storage Temperature | -40 to +85°C |
| Mounting | DIN rail |
| Dimensions, including cover/I/O pack | 17.0 × 24.9 × 15.3 cm |
| Safety Compliance | IEC 61508 |
| Hazardous Location Capability | Class 1 Div. 2 / Class 2 Zone 2 / ATEX, subject to applicable installation requirements |
GE specifies the SRLYS2A as a simplex S-type terminal board with 12 Form-C relay circuits. The IS420YDOAS1B YDOA I/O pack mounts directly to the board and provides the electronic output interface to the Mark VIeS control system.
Product Introduction
The is a Mark VIeS Functional Safety System simplex relay contact output terminal board designed to interface safety control logic with discrete field actuators. It provides 12 Form-C relay outputs through 48 customer terminals, with the compatible IS420YDOAS1B I/O pack mounted directly on the terminal board. Each relay includes an isolated contact pair used for position feedback to the I/O pack, allowing the control system to monitor the commanded-versus-actual relay state.
The GE IS400SRLYS2ABB designation is associated with the board-level SRLY hardware, but procurement should not rely on the suffix alone. GE’s system documentation identifies the complete terminal-board assembly as and the internal board as IS400SRLYS2A. When replacing an installed unit, verify the complete label, board revision, cover, terminal blocks, and attached I/O pack before accepting a replacement.
IS410SRLYS2A IS400SRLYS2ABB
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
Relay output replacement in a safety controller is rarely just a matter of matching the number of outputs. The field load, relay contact rating, wetting or fuse arrangement, I/O pack revision, and safety-system configuration all affect whether the replacement is appropriate. The is specifically a simplex SRLY configuration, so it should not be treated as a direct substitute for the Mark VIeS TRLY boards used where TMR output architecture is required.
Typical Applications
- Mark VIeS turbine and critical equipment safety control
- Discrete actuator and relay-interface applications
- Solenoid, contactor, and other field relay circuits
- Legacy Mark VIeS safety-system maintenance and spare-parts programs
Technical Pitfalls
1. Do not confuse SRLY with TRLY.
SRLYS2A is a simplex terminal-board configuration. GE identifies TRLY as the relay output terminal board family that can support Simplex or TMR configurations.
2. The I/O pack is a separate procurement item.
The SRLY board accepts an IS420YDOAS1B I/O pack. A terminal board without the correct I/O pack is not equivalent to a complete operating output assembly.
3. Contact wetting and fusing are configuration-dependent.
The basic uses dry Form-C contacts without fusing. Optional WRO daughterboards can modify the contact wetting and fuse arrangement. Do not assume an existing WRO configuration transfers automatically to a replacement board.
4. Check the field load before energizing.
GE specifies different contact limits for DC and AC loads. A relay output suitable for a low-current control circuit should not automatically be assumed suitable for a larger solenoid or contactor load.
5. Inspect the complete part-number chain.
For IS400SRLYS2ABB, confirm the board marking, hardware revision, terminal-board assembly number, I/O pack part number, and any installed WRO daughterboard. A visually similar Mark VIe/Mark VIeS board is not sufficient evidence of interchangeability.
6. Safety certification applies to the system configuration.
GE identifies the SRLYS2A assembly as safety-rated and IEC 61508 compliant, but that should not be interpreted as meaning that any arbitrary field circuit connected to the relay contacts is automatically a SIL-rated application. The complete safety architecture and application must satisfy the applicable requirements.
Related Products
- IS420YDOAS1B — Mark VIeS YDOA discrete output I/O pack used with the SRLY terminal board.
- IS410TRLYS1B — Mark VIeS relay contact output terminal board supporting Simplex or TMR configurations.
- IS400WROBH1A — Optional contact-wetting/fusing daughterboard for SRLYS2A.
- IS400WROFH1A — Optional fused relay-contact daughterboard.
- IS400WROGH1A — Optional relay-contact wetting/fusing configuration.
- IS410STAIS2A — Mark VIeS simplex contact-input terminal-board family.
- IS410TBCIS2C — Mark VIeS T-type contact-input terminal board for 24 VDC applications.
- IS410JPDHG1A — Mark VIeS power-distribution hardware, serving a different system function.
Procurement note: If the requirement is specifically , match the complete installed assembly rather than purchasing solely by the shorter board number. The I/O pack, terminal blocks, WRO daughterboard configuration, and hardware revision can materially affect field compatibility.
