The GE Fanuc IC694MDL250, also cataloged as the IC694MDL250 Discrete Input Module, operates as a dedicated hardware component for 120 VAC discrete signal detection within PACSystem RX3i platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IC694MDL250 |
| Brand | GE Fanuc / Emerson |
| Origin | USA |
| Weight | 0.23 kg (0.50 lbs) |
| Dimensions | Standard RX3i single-slot module |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 60 mA at 5 VDC (from backplane) |
| Number of Channels | 16, individually isolated |
| Nominal Input Voltage | 120 VAC (47 to 63 Hz) |
| Input Voltage Range | 0 to 132 VAC |
| On-State Voltage / Current | 70 to 132 VAC / 6 mA (7 mA typical per channel) |
| Off-State Voltage / Current | 0 to 20 VAC / 2.5 mA maximum |
| Response Times | On: 30 ms max / Off: 45 ms max |
| Configurable Input Filter | 20 ms to 2540 ms in 20 ms increments |
| Optical & Channel Isolation | 250 VAC continuous; 1500 VAC for 1 minute |
| Compatible Connectors | IC694TBBx32 or IC694TBSx32 terminal blocks |
Backplane Bus Communication Velocity & I/O Density Scaling
The IC694MDL250 communicates with the PACSystem RX3i CPU via the backplane bus, transferring the status of all 16 isolated AC channels in a single backplane scan cycle. Configurable input filtering times (adjustable from 20 ms to 2540 ms in 20 ms increments) are pushed directly from the CPU to mitigate field contact bounce and line noise. Dedicated firmware flash compatibility enables real-time diagnostic reporting of field-side terminal block status back to the host CPU while keeping backplane power draw at 60 mA.
Frequently Asked Questions
Q: What is the backplane power requirement for the IC694MDL250 module?
A: The module draws a maximum current of 60 mA from the 5 VDC backplane bus when all 16 input channels are energized.
Q: Are the input channels on the IC694MDL250 grouped or individually isolated?
A: All 16 channels are individually isolated from each other and provide 250 VAC continuous (1500 VAC for 1 minute) isolation between field wiring and the backplane logic.
Q: How are input filter settings configured on this module?
A: Filter settings are configured through system software and transferred from the RX3i CPU to the module in 20 ms increments, ranging from 20 ms to 2540 ms.
Field Installation Guidelines
- Disconnect main power to the PACSystem RX3i rack prior to mounting or removing the IC694MDL250 module to prevent connector damage.
- Align the module card guide with the baseplate slot and push until the retaining mechanism latches onto the rack.
- Wire field inputs using approved IC694TBBx32 or IC694TBSx32 terminal blocks, ensuring signal cables maintain physical separation from high-voltage motor supply lines.
- Verify that field supply voltages stay within the 0 to 132 VAC operating envelope to prevent overvoltage damage to channel optocouplers.
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