ABB DSQC626 | Digital Input/Output (I/O) Module |

? GE IS420YDOA1B – Discrete Output Module

Function: Controls relays to switch external devices on/off as instructed by the control system.

• Power Supply: 24 VDC

• Channels: 12 discrete output channels

• Output Type: SPDT (Single Pole Double Throw) relay contacts

• Relay Type: Plug-in, serviceable

• Max Output Current: 2 A per channel

• Contact Life: >10 million operations

• Communication Speed: Up to 1 Mbps

• Operating Temperature: –40 °C … +70 °C

• Typical Application: Relay actuation for external electrical equipment control

? GE IS220YDIAS1B – Discrete Input Module (Safety Critical)

Function: Collects and transmits safety-critical sensor and actuator data to the control system, ensuring safe and reliable gas turbine operation.

• System Role: Part of the Mark VIe gas turbine control system

• Input Function: Acquires discrete signals from safety-critical field devices

• Safety: Designed for reliability and fault tolerance in turbine protection

• Application: Monitoring of turbine safety devices (e.g., limit switches, protection relays, interlocks)

• Integration: Transmits sensor/actuator status to control logic for real-time decision making

✅ Summary:

• IS420YDOA1B is an output-side module, focusing on actuation (relay control).

• IS220YDIAS1B is an input-side module, focusing on data acquisition from safety-critical sources.
  Together, they form complementary parts of the Mark VIe I/O subsystem for gas turbine monitoring, protection, and control.

Would you like me to build a side-by-side comparison table (Inputs vs Outputs) for these two modules, so the differences are crystal clear at a glance?

Here’s a side-by-side comparison table for the two GE Mark VIe modules you mentioned — one input, one output — so the differences are clear at a glance:

GE Mark VIe I/O Modules – Comparison

✅ In short:

• IS420YDOA1B → “Actuator side” — outputs to control relays/equipment.

• IS220YDIAS1B → “Sensor side” — inputs from safety-critical field devices.
  Together they form the control + protection loop within the GE Mark VIe system.