Description
Product Introduction
The Moeller LE4-116-DX1 is a 16-channel 24VDC digital input expansion module engineered for the PS4 series micro-PLCs. Designed to snap directly onto the local expansion rack, it bridges proximity switches, pushbuttons, and auxiliary contacts directly into the CPU’s I/O table. It remains a staple across legacy packaging systems, material handling lines, and HVAC skids.
Unlike standalone remote I/O blocks, the LE4-116-DX1 uses direct backplane bus connections, keeping scan times down and skipping the delay of serial fieldbus conversions. Its high channel density pack 16 points into a tight footprint, cutting panel space needs significantly.
Key Technical Specifications
| Parameter | Value |
| Input Channels | 16 Digital Inputs |
| Nominal Input Voltage | 24V DC (-15% / +20%) |
| Input Current per Channel | ~6 mA @ 24V DC |
| Signal Level – State 0 | -3V DC to +5V DC |
| Signal Level – State 1 | +15V DC to +30V DC |
| Input Filtering / Delay | Typ. 0.2 ms |
| Bus Connection | Integrated LE4 local expansion ribbon cable/connector |
| Isolation | Optocoupler isolated per channel group |
| Status Indicators | 16 Red Channel Status LEDs |
| Operating Temperature | 0°C to +55°C |
| Mounting Type | 35mm DIN rail |
Application Scenarios & The “Trench” Experience
A high-speed palletizer drops off the main line at 2:00 AM because an aging input module lost half its channels to an inductive spike from a unsuppressed solenoid. The shift supervisor faces an immediate $4,000 per hour downtime bill while technicians search for a replacement card that hasn’t been produced in years. This is where having a verified replacement LE4-116-DX1 on the shelf saves the day.
- Packaging Systems – Conveyor jam detection & optical sensor monitoring – High-density inputs allow multi-lane monitoring without adding extra PLC bases.
- Water Treatment – Valve limit switch feedback – Fast optical response time ensures real-time feedback for critical valve positions.
- Material Handling – Sorting system interlocks – Compact layout allows mounting inside tight, distributed control panels along the line.
Field Case Study: A midwest automotive stamping plant faced an emergency shutdown when an existing Moeller PS4 controller lost communication with its downstream I/O. The field tech discovered internal optocoupler degradation on the LE4-116-DX1 caused by a line surge. Swapping in a pre-tested surplus module from our stock restored full production in under 20 minutes, avoiding a multi-shift line halt.
Transparency SOP: Quality Assurance & Testing
We test every LE4-116-DX1 on live hardware before it leaves the warehouse:
- Inbound Visual & Anti-Counterfeit Inspection: Housing condition, terminal block integrity, backplane connector pins, and OEM serial verification.
- Power-On & Communication Handshake: Module is attached to a Moeller PS4 base unit via the LE4 extension ribbon cable; bus communication is established and verified.
- 16-Point Signal Injection: Every channel is individually triggered with 24VDC. We verify PLC input status registers and check the front LED for every channel.
- Thermal & Stress Soak: Run the module under full channel load in a test bench rack to catch thermal drift issues.
- ESD Packaging: Cleared modules are sealed in static-shielding bags with custom foam boxing for transit protection.
LE4-116-DX1
LE4-116-DX1
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Watch the Extension Cable Pins: The local bus connector on the LE4 series uses delicate ribbon pins. Never yank the module off the rail sideways without clearing the bus bridge first, or you’ll bend pins and destroy the backplane.
- ❗ Verify Field Power Polarity: The LE4-116-DX1 expects sinking/sourcing setups configured correctly. Reversing 24VDC commons won’t burn the card due to protection diodes, but your inputs won’t trigger, leaving you chasing ghosts.
- ⚠️ Beware of Residual Cable Voltage: Inductive coupling on long unshielded sensor runs can feed 8V to 10V of phantom voltage back into the card. The threshold for “State 1” is around 15V, but lingering phantom voltage can delay the “State 0” transition, causing weird logic errors.
- ❗ Check the Termination Resistor: If this is the last module on your LE4 expansion chain, make sure the end-of-bus terminator block is seated properly on the expansion port. Skipping this will drop the entire local I/O rack off the CPU network.
Frequently Asked Questions (FAQ)
Q: Can I hot-swap the LE4-116-DX1 while the PLC is powered up?
A: No. Pulling this module live can generate a bus fault on the PS4 CPU and potentially damage the backplane driver ICs. Power down the 24VDC system bus before unseating the module.
Q: Is the LE4-116-DX1 compatible with newer Eaton Easy-Control systems?
A: No, this module belongs to the classic Klockner Moeller PS4 / LE4 architecture. It uses the legacy ribbon bus interface, not the modern Eaton expansion buses.
Q: Are these units brand-new from Eaton?
A: Eaton/Moeller discontinued this series years ago. These are high-grade New Surplus (unused original stock) or fully reconditioned units tested to OEM specs.
Q: How do I know if an input failure is in the module or the field wiring?
A: Disconnect the field terminal arm, take a jumper wire from your known 24VDC supply, and trigger the input terminal directly. If the LED lights up and the PLC register changes, your issue is field wiring or sensor degradation, not the module.
Q: What warranty comes with these legacy modules?
A: We supply a full 12-month operational replacement warranty on all surplus and refurbished hardware. If a card fails under normal operating conditions within a year, we swap it out directly.
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