GE IC694MDL742 PACSystems RX3i Voltage Output Module

Configured for discrete circuit switching in PACSystems RX3i platforms, the GE IC694MDL742 (IC694MDL742 Voltage Output Module) provides direct physical/electrical execution. The hardware operates as a 16-point discrete output module organized into two distinct groups of 8 channels utilizing sinking (negative) logic. It executes localized switching arrays for external dc field instruments, utilizing integrated electronic short-circuit protection circuits to isolate internal logic components from sudden overcurrent events.

Hardware Specifications

Backplane Bus Communication Velocity and Electronic Protection Circuits

The module interfaces directly through the proprietary backplane bus communication velocity architecture of the RX3i system, ensuring low-latency processing of register updates. Internal electronic short-circuit protection is split into two independent sections to isolate faults without interrupting the complete module array; points 1 to 8 are bound to the first protective loop, while points 9 to 16 are managed by the second. Field-side logic state validation is continuously synchronized across the backplane, and an active failure state triggers a localized hardware Fault LED to enable rapid maintenance mapping.

Frequently Asked Questions

Q: What action must be performed to reset the module after a short-circuit trip?

A: When the electronic short-circuit protection deactivates an output group due to an overcurrent fault, the field-side fault must be cleared, and the command bit or external logic loop must cycle to reset the hardware latch.

Q: Does this module supply internal DC power to the connected loads?

A: No. The internal backplane power drives only the module’s logic and optocouplers. All external field instruments and switching circuits require an independent, external 12 to 24 VDC power supply connected to the terminal blocks.

Q: What are the restrictions regarding the module hot-swap feature in the RX3i platform?

A: The hardware supports hot swapping through designated insertion and removal steps, allowing terminal extraction or replacement while the backplane is powered, provided the field-side power is isolated to prevent accidental arcing.

Field Installation Guidelines

• Module Insertion Alignment: Insert the module into the designated RX3i carrier slot, ensuring the rear connector aligns with the backplane pin assembly. Press firmly until the top and bottom structural tabs click into place to establish low-impedance grounding.
• Negative Logic Wiring Separation: Route the common return path cables safely and isolate the sinking output lines from high-voltage AC lines to minimize electromagnetic noise coupling across parallel runs.
• External Power Supply Commoning: Connect the negative leg of the external 12 to 24 VDC field power supply directly to the corresponding group common terminal on the faceplate assembly to ensure a stable reference potential for sinking logic.