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Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | GE Fanuc / GE Intelligent Platforms |
| Current Product Brand | Emerson Automation |
| Series | PACSystems RX3i |
| Part Number | IC694MDL754 |
| Product Type | High-density DC discrete output module |
| Output Logic | Positive logic / sourcing |
| Number of Outputs | 32 |
| Output Grouping | Two isolated groups of 16 outputs |
| Rated Voltage | 12/24 V DC nominal |
| External Supply Range | 12–30 V DC |
| Output Voltage Range | 10.2–30 V DC |
| Output Current | 0.75 A per point |
| Output Voltage Drop | 0.3 V DC maximum |
| Inrush Current | 3 A for 10 ms without ESCP trip |
| Steady-State Overcurrent Trip | Approximately 5 A per point |
| Output Leakage Current | 0.1 mA maximum |
| On Response Time | 0.5 ms maximum |
| Off Response Time | 0.5 ms maximum |
| Protection | Short circuit, overcurrent, and overtemperature with auto recovery |
| Field-to-Backplane Isolation | 250 V AC continuous; 1,500 V AC for 1 minute |
| Group-to-Group Isolation | 250 V AC continuous; 1,500 V AC for 1 minute |
| Backplane Consumption | 300 mA maximum from the 5 V bus |
| External Supply Current | Approximately 72 mA per group off; up to 132 mA per group on for CC and later revisions |
| Thermal Derating | No derating at 24 V DC; derating applies at 30 V DC above approximately 42 °C |
| Default Output Mode | Force Off or Hold Last State, selected by rear DIP switch |
| Module ID | 0x059h |
| Compatible CPU | RX3i CPU release 2.90 or later |
| Terminal Blocks | IC694TBB032 box style or IC694TBS032 spring clamp |
| Mounting | RX3i backplane I/O slot |
| Status Indication | 32 point LEDs, two field-power LEDs, terminal-block status LED |
| Firmware | Revision-dependent; verify module revision |
| Condition | Must be stated as New Original, New Surplus, or Refurbished (tested) |
The IC694MDL754 is an Emerson PACSystems RX3i 32-point, 12/24 V DC positive-logic output module. It provides 0.75 A sourcing capability per point and divides the outputs into two isolated groups of 16.
Each point includes electronic short-circuit, overcurrent, and overtemperature protection with automatic recovery. The module supports either Force Off or Hold Last State when CPU communication is lost, but the rear DIP-switch selection must match the configured software setting.
Product Introduction
GE Fanuc IC694MDL754 is a PACSystems RX3i high-density discrete output module with 32 positive-logic, sourcing outputs. It switches 12/24 V DC loads at up to 0.75 A per point and uses two isolated groups with separate field-power commons.
The module suits solenoids, contactor coils, valves, relays, and other DC loads within the output rating. Verify the CPU firmware, output-default DIP switch, external supply voltage, terminal block, load inrush, and thermal derating before commissioning.
IC694MDL754
IC694MDL754
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| All outputs are off | Missing external field power, blown fuse, or CPU inhibit | ✅ High | Measure 12–30 V DC at terminals 17–18 and 35–36 for the two output groups | Check field supplies and group commons before replacing the module |
| One group is off | Group-specific field-power loss or wiring fault | ✅ High | Measure the appropriate group supply and inspect its fuse and common terminals | Repair the affected group supply before replacing the module |
| One output will not turn on | Open load, output fault, wrong logic, or programmed inhibit | ✅ High | Check the point LED, output voltage at the terminal, and load continuity | Verify the PLC command and field wiring before replacement |
| Output turns off under load | Short circuit, overcurrent, thermal trip, or insufficient supply | ✅ High | Measure load current and inspect the output fault status bit | Remove the short or reduce load current; ESCP should recover after the fault clears |
| Output remains on | Hold Last State selected, logic error, or output-stage failure | ✅ High | Check the rear DIP switch and CPU configuration; remove the command and measure output | Correct the default-mode mismatch; replace only if the point remains energized |
| Outputs cycle or oscillate | Low field voltage, unstable supply, excessive load, or revision-specific issue | ✅ High | Measure field voltage while the outputs are commanded on and inspect load current | Stabilize the supply and verify the module revision |
| Module reports field-power fault | Supply below limit, open common, or terminal-block problem | ✅ High | Measure voltage directly at the field-power terminals under load | Correct the group power wiring and terminal connection |
| Point LED is yellow | Output fault or ESCP condition | ✅ High | Read the RX3i diagnostic data and remove the field load to isolate the fault | Clear the external fault; replace the module if the fault persists unloaded |
| Terminal-block LED is red | Terminal block missing or not locked | ❌ Low | Inspect the front terminal block and locking mechanism | Install and secure IC694TBB032 or IC694TBS032 |
| PLC reports module mismatch | Wrong module configuration, revision, or CPU firmware | ✅ High | Compare configured catalog number and CPU firmware with the installed module | Correct the configuration or upgrade the CPU as approved |
| Output does not switch a valve or relay | Load coil voltage mismatch, incorrect polarity, or insufficient current | ✅ High | Measure load voltage and current; verify the device’s coil rating and suppression | Use the correct DC load and add suppression where required |
| Module overheats | Too many outputs on at 30 V DC, high ambient temperature, or excessive load | ✅ High | Measure cabinet temperature and count energized points in each group | Apply the thermal derating curve and reduce load or temperature |
| Replacement behaves differently during CPU loss | Force Off/Hold Last State mismatch | ✅ High | Compare the rear DIP switch with the software configuration and test communication loss | Align hardware and software settings before placing the system in service |
Critical warning: The output module switches user-supplied field power; it does not provide load power from the backplane. Confirm polarity and use flyback suppression for inductive loads. Never change the rear DIP switch while the module is installed and energized.
Frequently Asked Questions (FAQ)
What is GE Fanuc IC694MDL754?
It is a PACSystems RX3i 32-point, 12/24 V DC positive-logic output module. It provides sourcing outputs rated at 0.75 A per point, with two isolated groups of 16 outputs.
Is IC694MDL754 compatible with Series 90-30?
No. The module is intended for PACSystems RX3i and must be used with an RX3i CPU release 2.90 or later. The system manual specifically states that it cannot be used with a Series 90-30 CPU.
Does the module include a terminal block?
No. The terminal block is ordered separately. Compatible options include the IC694TBB032 box-style terminal block and IC694TBS032 spring-clamp terminal block.
What does ESCP mean?
ESCP means Electronic Short-Circuit Protection. Each output monitors for overcurrent, short circuit, and overtemperature. After the external fault is removed, the output driver can automatically recover, subject to the module’s fault and command state.
What is the difference between Force Off and Hold Last State?
Force Off turns outputs off when CPU communication is lost. Hold Last State maintains the last programmed output values when field power is present. The rear DIP switch and RX3i software configuration must match, or the module reports a configuration fault.
Can each output switch 0.75 A continuously?
The nominal per-point rating is 0.75 A, but total usable loading depends on ambient temperature, supply voltage, duty cycle, and the number of energized outputs. At 30 V DC, outputs require thermal derating above approximately 42 °C.
Can I use 12 V and 24 V loads on the same module?
The two isolated groups can be powered separately, allowing different field supplies within the approved 12–30 V DC range. Verify the group wiring, load ratings, and protection scheme before mixing voltages in one installation.
Is the unit new or refurbished?
The catalog number does not establish condition or revision. State the actual status as New Original, New Surplus, or Refurbished (tested). A proper test report should cover all 32 outputs, both field-power groups, ESCP recovery, LEDs, terminal-block detection, Force Off/Hold Last State behavior, backplane communication, and loaded operation.
