The GE IC693MDL645, also cataloged as the IC693MDL645 16-Point Input Module, operates as a dedicated hardware component for interfacing discrete field sensing devices within Series 90-30 PLC platforms.
| Parameter | Specification |
|---|---|
| Model | IC693MDL645 |
| Brand | GE Fanuc / General Electric |
| Origin | Factory standard |
| Weight | 0.20 kg (0.44 lbs) |
| Dimensions | Single-slot chassis occupancy |
| Operating Temp | 0 to 60 deg C (Standard industrial environment) |
| Power Consumption | 80 mA at 5 VDC (backplane), 125 mA at 24 VDC (backplane) |
| Channel Density | 16 input points |
| Circuit Grouping | 1 group of 16 channels (shared common) |
| Input Logic Type | Positive / Negative logic (Sourcing / Sinking) |
| Nominal Input Voltage | 24 VDC |
| Input Voltage Range | 0 to 30 VDC |
| On-State Voltage | 15.5 to 30 VDC |
| Minimum On-State Current | 3.2 mA per input |
| Optical Isolation | 1500 VDC (between field side and logic side) |
| Status Indicators | 16 discrete LEDs (two horizontal rows) |
The module maps 16 discrete input points into a single physical slot configuration on the Series 90-30 parallel backplane. Internal logic processing requires balanced power allocation, drawing a maximum of 80 mA from the 5 VDC rail and 125 mA from the 24 VDC rail to maintain stable register state transitions. To preserve overall backplane bus communication velocity across high-density I/O configurations, optical couplers establish a 1500 VDC isolation barrier. This barrier isolates the inner microprocessor sensing plane from high-voltage field spikes generated by mechanical proximity switches or long cable runs, ensuring data frame transmission integrity through the local chassis backplane.
Q: Can both sourcing and sinking wiring configurations be used simultaneously on different channels of the same module?
A: No. Because all 16 input channels are internally tied to a single common return path within the single-group architecture, the entire module must be wired uniformly as either all positive logic (sinking module configuration) or all negative logic (sourcing module configuration).
Q: Is this discrete input module designed to allow hot-swapping under field power?
A: No. The Series 90-30 chassis architecture lacks live insertion capabilities. Main backplane power and external 24 VDC field power must be completely locked out before extracting or inserting the module to prevent backplane data corruption or hardware damage.
Q: What power source supplies the 125 mA current demand at 24 VDC?
A: The 125 mA current is drawn directly from the 24 VDC isolated power pin on the PLC backplane bus, which is supplied by the main chassis power supply module, rather than from external field excitation loops.
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