Lenze E94AYAB Safety Module SM100 – L-force 9400 Series
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Product Information
The Lenze E94AYAB Safety Module SM100 is a dedicated functional safety component designed for integrated installation into Lenze L-force Servo Drives 9400 series, including both StateLine and HighLine single-drive and multi-drive units. Operating as a plug-in module inserted into safety slot M on the drive controller, the SM100 provides integrated Safe Torque Off (STO) capability. This function safely suppresses drive motor output torque within 20 ms of safety signal de-energization without removing main supply power from the drive control electronics, maintaining control state and significantly reducing restart times following safety stops.
Field connections for emergency stop buttons, light curtains, and safety door interlocks connect to the module via a pluggable terminal connector X80 using dual-channel 24 V DC safety inputs labeled SIA and SIB. Placing a replacement E94AYAB module into service does not require software programming, parameter downloading, or firmware matching, as all safety functions are defined entirely through physical hardware architecture. Maintenance technicians can simply insert the replacement module into slot M and reattach the X80 terminal connector. ABC Industrial Parts provides tested replacement units to support rapid equipment recovery when drive safety modules require exchange.
Visual operational status is indicated on the module front panel via two diagnostic LEDs: a yellow STO LED that turns on when torque suppression is active, and a green Ready LED that indicates proper control supply power and functional module integrity. Operational states and diagnostic data are also accessible through the Lenze L-force Engineer software or the drive keypad via system diagnostic parameters in the C00800 parameter series. Active fault codes such as 0x0071 or 0x0072 signal module communication errors or input channel state discrepancies, which should be checked by verifying physical seating in slot M and equal switching states across dual-channel wiring at terminal X80.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | E94AYAB |
| Model / Type | Safety Module SM100 |
| Product Family | L-force Servo Drives 9400 |
| Safety Function | Safe Torque Off (STO) |
| Safety Integrity Level | SIL 3 |
| Performance Level | PL e, Category 4 |
| Input Voltage | 24 V DC |
| Number of Safety Inputs | 2 (Dual-Channel SIA, SIB) |
| Response Time | 20 ms |
| Mounting Location | Safety Slot M (Lenze 9400) |
Programming and Configuration
The Lenze E94AYAB Safety Module SM100 operates on a hardware-based functional design that requires no software programming or parameter transfer during commissioning or replacement. Safety functions are hardwired through the physical terminal configuration, allowing spare modules to be swapped without using specialized safety configuration software.
System diagnostic parameters, including the C00800 parameter series, allow operators to monitor safety module status through Lenze L-force Engineer software or the connected drive keypad. These parameters confirm proper module detection and hardware status within the overall drive control system.
Communication and System Integration
The E94AYAB integrates directly into Lenze 9400 StateLine and HighLine servo drives via dedicated safety slot M. This direct mechanical and electrical connection allows the module to disable drive output torque in under 20 ms upon input switching.
External safety devices interface with the safety module through the pluggable terminal connector X80. The 24 V DC dual-channel input structure (SIA and SIB) enables seamless integration with standard functional safety circuits, including emergency stop relays, safety gates, and multi-axis interlock networks.
Diagnostics and Status Indication
Local state monitoring is performed via front-panel LED indicators. The yellow STO LED provides visual indication of active torque disabling, while the green Ready LED confirms that 24 V power is present and internal module checks have passed.
Remote diagnostic tracking is supported using Lenze L-force Engineer software or drive keypads. Diagnostics can read specific drive parameters in the C00800 series to verify safety module functional states and pinpoint channel wiring discrepancies.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| STO | Yellow - Solid / Off | ON = Safe Torque Off (STO) function active (drive output safely disabled). OFF = Safe Torque Off inactive (drive permitted to run if enabled). |
| Ready | Green - Solid / Off | ON = Safety module power supply present and functional. OFF = Supply voltage missing or internal module fault. |
Replacement and Spare Part Considerations
When replacing an E94AYAB safety module, check that the unit is firmly seated in safety slot M of the Lenze 9400 drive controller. Loose physical seating or damaged connector pins can trigger fault code 0x0071.
Ensure that the dual-channel wiring connected to terminal X80 maintains synchronized switching logic across channels SIA and SIB. Discrepancies between input states will result in fault code 0x0072, requiring wiring verification prior to clearing the drive fault.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| 0x0071 | Safety module mismatch / communication error | Drive controller detected an error in safety module identification or interface communication. | Module not seated correctly in slot M, wrong module type inserted, or internal module interface failure. | Check module seating in slot M. Verify part number E94AYAB. Replace module if hardware error persists. |
| 0x0072 | Safety module hardware error | Internal self-test of the safety module failed or discrepancy detected between input channels. | Discrepancy time exceeded between input channels SIA and SIB, or internal hardware error on SM100 board. | Check dual-channel wiring at terminal X80. Verify equal switching state of both channels. If channel inputs are identical and fault remains, replace SM100 module. |
Frequently Asked Questions
Which drive controllers are compatible with the Lenze E94AYAB Safety Module SM100?
The E94AYAB module is compatible with Lenze 9400 StateLine and HighLine servo drives, including both single-drive and multi-drive versions, installing into dedicated safety slot M.
Is software parameter configuration required when replacing an E94AYAB safety module?
No software parameter configuration or programming is required. The SM100 relies on physical hardware logic, making hardware replacement straightforward without software setup.
What safety performance standards does the Lenze E94AYAB comply with?
The module meets functional safety standards up to SIL 3 according to IEC 61508 and EN 62061, as well as PL e, Category 4 according to EN ISO 13849-1.
How do you clear fault code 0x0072 on the E94AYAB module?
Fault code 0x0072 indicates a channel discrepancy or hardware error. Verify dual-channel 24 V DC wiring at terminal X80 to ensure channels SIA and SIB switch simultaneously. If the input states match and the fault persists, replace the module.
What is the signal response time for the Safe Torque Off function on the E94AYAB?
The maximum signal response time is 20 ms upon de-energization of the 24 V DC safety inputs.
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