GE Fanuc RX3i PACSystems IC694MDL660 24 VDC 32-Point Discrete Input Module

Module Performance and Architecture

The IC694MDL660 is a high-density discrete input solution for the GE Fanuc PACSystems RX3i platform, featuring 32 independent points configured for either positive or negative logic (sinking or sourcing). To enhance system reliability and noise immunity, the module is architected into four isolated groups of eight inputs each. This allows for the integration of different power sources or logic types within a single slot, making the IC694MDL660 an ideal choice for space-constrained control cabinets requiring high I/O throughput.

Comprehensive Technical Specifications

The following parameters detail the electrical characteristics and physical tolerances of the IC694MDL660 (Part Number: IC694MDL660).

• Operating Voltage: 24 Volts DC (Nominal)

• Voltage Range: 0 to 30 Volts DC

• Input Configuration: 32 Points (4 Isolated groups of 8)

• Logic Compatibility: Positive Logic (Sinking) or Negative Logic (Sourcing)

• Input Current: 7.0 mA per point at 24 VDC

• On-State Voltage: 11.5 to 30 Volts DC

• Off-State Voltage: 0 to 5 Volts DC

• On-State Current: 3.2 mA minimum

• Off-State Current: 1.1 mA maximum

• Backplane Power Usage: 300 mA from the 5 VDC bus (all inputs active)

• Optical Isolation (Group to Group): 250 VAC continuous; 1500 VAC for 60 seconds

• Optical Isolation (Field to Backplane): 250 VAC continuous; 1500 VAC for 60 seconds

• Input Filter Delay: 0.5 ms typical

• Physical Weight: Approximately 0.91 kg (2.0 lbs)

Installation and Field Wiring

Due to its high density, the IC694MDL660 requires a high-density terminal block or a specialized Fujitsu-style connector interface (often used with Interposing Terminals or CAB-series cables). Unlike lower-density 16-point modules, this unit does not utilize the standard 20-screw terminal block directly on the faceplate. Proper grounding of the isolation groups is essential to maintain the 1500 VAC dielectric strength rating across the system.

Technical FAQ and Comparison

How does this differ from the IC694MDL645?The IC694MDL660 provides double the density with 32 points, whereas the MDL645 offers only 16 points. The MDL660 is more efficient for high-scale logic processing but requires more complex wiring management due to the increased pin count.

Can I mix Sinking and Sourcing logic on the same module?Yes. Because the IC694MDL660 features four isolated groups, you can wire one group for positive logic and another for negative logic, provided each group has its own dedicated common return.