Description
Product Introduction
GE IS420YDOAS1B is a Discrete Output I/O Module for the Mark VIeS control system.
To begin with, it provides electrical interfaces between up to two Ethernet networks and a discrete output terminal board.
Furthermore, this I/O pack supports simplex or TMR redundancy setups.
As a result, it suits gas, steam, and wind turbine control applications.
In addition, it works reliably from -40°F to 158°F.
Moreover, the pack controls up to twelve relays with terminal board feedback.
Key Features at a Glance
- 12 relay and coil monitors – each includes a yellow LED indicator
- 6 ms I/O pack response time – therefore fast for critical control loops
- Two RJ-45 Ethernet ports – consequently provides redundant network connections
- DC-37 pin connector – thus enables direct attachment to terminal board
- Three-pin power input – delivers 28V dc with reliable operation
- LED indicators on front – for instance, each shows output command energizing the relay
- ATTN LED – similarly, shows red or green, solid or flashing for diagnostic status
- Surface-mount technology – as a result, ensures modern and reliable construction
- BPPC processor board – notably, shared with Mark VIeS distributed I/O packs
Technical Specifications
Brand: General Electric
Model: IS420YDOAS1B
Series: Mark VIeS Safety Control
Outputs
12 relay and coil monitors
Response Time
6 ms I/O pack response time
Redundancy Compatibility
Simplex or TMR
Processor Board
BPPC
Technology
Surface-mount
Temperature Range
Ambient: -40°F to 158°F (-40°C to 70°C)
Dimensions
H 3.25 in x W 1.65 in x D 4.78 in
Functional Abbreviation
YDOA
Connectors
- Two RJ-45 Ethernet ports
- One DC-37 pin connector for outputs
- Three-pin power input (28V dc)
Indicators
- 12 yellow LEDs – one per output relay
- ATTN LED – red or green, solid or flashing
- BBPx processor LEDs – for additional diagnostics
Installation Guide
- First of all, mount the compatible discrete output terminal board securely.
- Then, insert one simplex YDOA pack or three TMR packs into the terminal board connectors.
- After that, use the threaded studs next to the Ethernet ports to secure the packs.
- Next, align the bracket so no right-angle force applies to the DC-37 connector.
- Subsequently, connect one or two Ethernet cables. Notably, ENET1 typically goes to the R controller network.
- Finally, plug in the 28V dc power connector – the pack includes soft-start for inrush control.
- Once installed, configure the I/O pack using ToolboxST.
Debugging & Maintenance Convenience
- To start, 12 yellow LEDs show each output relay status at a glance.
- In addition, the ATTN LED provides power and health status – for example, green flashing patterns indicate normal operation.
- Specifically, two 4 Hz pulses every four seconds mean the application is online and functioning.
- Likewise, BBPx processor LEDs offer additional diagnostic information.
- Furthermore, no special tools are required for pack replacement.
- Lastly, continuous self-monitoring helps detect faults early.
Compatibility Notes
- To begin, works with compatible discrete output terminal boards from the Mark VIe series.
- In particular, supports simplex configuration using one I/O pack.
- Similarly, supports TMR configuration using three I/O packs on the same terminal board.
- However, for TMR sets: all three packs must share the same hardware version.
- Additionally, uses the BPPC processor board – common across Mark VIeS distributed I/O packs.
- Finally, do not mix with older YDOA versions on the same terminal board.
Certifications & Environmental Performance
- To begin, built specifically for industrial turbine control environments.
- Moreover, operates reliably from -40°F to 158°F.
- In addition, surface-mount technology ensures consistent quality.
- Also, a protective outer chassis guards the interior circuitry.
- Finally, manufactured to GE quality standards in the USA.
Packing List & Warranty
Included in box
- One GE IS420YDOAS1B Discrete Output I/O Pack
- No cables or terminal boards included – sold separately
Warranty
12 months warranty from the date of shipment. Specifically, it covers manufacturing defects and normal use failures.
Shipping Methods
- FedEx – priority and economy options available
- UPS – worldwide tracking included
- DHL – express delivery for urgent needs
Typical Applications
- Gas turbine discrete output control
- Steam turbine relay and coil monitoring
- Wind turbine auxiliary output management
- Industrial process discrete actuation
- Safety-critical output applications with TMR redundancy
- Power plant relay control systems
Diagnostic Capabilities
- To begin with, ATTN LED patterns – green 2 Hz 50% or two 4 Hz pulses every four seconds indicate normal operation.
- On the other hand, red ATTN LED – signals a fault requiring attention.
- Furthermore, 12 yellow output LEDs – each confirms the command is energizing its relay.
- In addition, common diagnostic alarms – including alarms two, three, and five.
- For example, alarm five – indicates remote I/O mode. Causes: hardware failure or invalid module configuration. Solutions: replace the I/O pack or rebuild and reconfigure the system.
- Finally, BBPx processor LEDs – provide additional diagnostic codes.
FAQ – Frequently Asked Questions
Q1: What is the response time of IS420YDOAS1B?
A1: The I/O pack response time is 6 ms.
Q2: Can I use this pack in TMR redundancy?
A2: Yes. It supports both simplex and TMR configurations.
Q3: How many relays can this pack control?
A3: It controls up to twelve relays with coil monitoring.
Q4: What does the green ATTN LED pattern mean?
A4: Two 4 Hz pulses every four seconds means the application is online and working.
Q5: What causes alarm five on this pack?
A5: Alarm five means the pack is in remote I/O mode. Causes include hardware failure or invalid configuration.
Q6: How do I fix alarm five?
A6: Replace the I/O pack or rebuild the system and reconfigure the pack.
Q7: What temperature range does this module support?
A7: It operates from -40°F to 158°F (-40°C to 70°C).
Q8: Does this pack work with the BPPC processor board?
A8: Yes. It uses the BPPC processor board.
Experience-Based Q&A
Q9: My yellow output LED is on but the relay does not switch. What should I check?
A9: First of all, check the terminal board wiring and relay coil resistance. Next, verify the external power supply to the relay. Finally, test the pack on a known working terminal board.
Q10: Can I hot-swap this I/O pack during operation?
A10: The design allows safe insertion with power applied due to soft-start. However, avoid frequent hot-swap to maintain connector life and system stability.
Q11: How do I interpret the BBPx processor LEDs?
A11: Refer to the GEH-6855 manual. Different blink patterns indicate processor status, network health, and application state.
Q12: My pack shows no LEDs at all. What is wrong?
A12: First, check the 28V dc power connection. Then, verify the power supply is working. If power is present, the pack may have failed.
Q13: How long does installation take for a trained technician?
A13: About 10 minutes for simplex setup. For TMR including cabling, allow 25-30 minutes.
Purchasing Guidance
- To save cost, choose simplex for non-critical output control.
- On the other hand, choose TMR for safety-critical or high-availability turbine applications.
- Before buying, verify your terminal board is compatible with YDOA packs.
- Also, check your ControlST version for proper configuration support.
- Furthermore, confirm you need 12 relay outputs – if fewer outputs suffice, consider smaller options.
- Need 11 mm Proximity Probes? Click here: 11 mm Proximity Probes
- Finally, order a spare unit to minimize downtime in critical operations.
- Additionally, contact us for bulk discounts or customized shipping arrangements.
Contact Information
For inquiries, please contact:
+86 158 8020 0923 – Click to chat on WhatsApp
Copyright & Partners
Copyright © 2026 PLCDCS HUB Limited. All rights reserved.
Original Source: https://plcdcshub.com/
Partner: Powergear X Automation Limited
Partner: Oiltech Controls Limited
0.0 Average Rating Rated (0 Reviews)