Siemens 6ES5441-7LA12 SIMATIC S5 441
Price range: € 81,82 through € 297,00
The Siemens SIMATIC S5 6ES5441-7LA12 is a digital output module belonging to the SIMATIC S5 series of programmable logic controllers. This module is designed for use with S5-115U, S5-135U, and S5-155U central processing units, providing discrete output capability for industrial control applications. It operates as part of Siemens' established S5 automation platform, which was widely deployed across manufacturing and process industries.
The 6ES5441-7LA12 provides 32 digital outputs with a 24 V DC output voltage, organized in groups with common potential. The module interfaces directly with the S5 backplane bus and is housed in a rugged plastic enclosure suitable for installation in S5 subrack systems. Outputs are transistor-based, offering fast switching response and compatibility with a wide range of actuators and field devices. The module includes LED status indicators for each output channel, enabling quick visual diagnostics during commissioning and maintenance.
This output module is used extensively in discrete manufacturing, automotive assembly lines, material handling systems, and process automation installations where reliable digital output control is required. Its compatibility with the S5-115U, S5-135U, and S5-155U systems makes it a standard component in legacy Siemens S5 installations that remain operational in many industrial facilities. The module is particularly valued in retrofit and maintenance scenarios where existing S5 infrastructure must be preserved or restored.
Technical Specifications
| Output Channels | 32 |
|---|---|
| Output Voltage | 24 V DC |
| Output Current per Channel | 0.5 A |
| Total Output Current | 4 A |
| Output Type | Transistor (sourcing) |
| Signal Groups | 4 groups of 8 outputs |
| Status Indicators | LED per channel |
| Backplane Bus | SIMATIC S5 bus |
| Compatible Systems | S5-115U, S5-135U, S5-155U |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +70 °C |
| Relative Humidity | 15 % to 95 % (non-condensing) |
| Mounting | S5 subrack (rail-mounted module) |
| Certifications | CE |
Common Diagnostic Codes
- BADF (Bus Access Diagnostic Fault)
- The module is not responding on the S5 backplane bus, indicating a communication failure between the CPU and the output module.
Check module seating in the subrack slot. Reseat the module firmly and verify backplane bus connectors are undamaged. Replace module if fault persists. - Output Short-Circuit
- One or more output channels have detected a short-circuit condition, causing the affected output group to shut down.
Identify the shorted load by disconnecting field wiring group by group. Repair or replace the shorted actuator or wiring before re-enabling outputs. - Group Fault (Output Group Disabled)
- An entire output group has been disabled due to overcurrent or overtemperature in that group.
Allow the module to cool, reduce load current within the group to within rated limits, and cycle power. Check for overloaded or shorted outputs. - CPU Stop Mode
- The CPU has entered STOP mode, causing all outputs on the module to de-energize as a safety response.
Check the CPU for programming errors or hardware faults. Review the diagnostic buffer on the CPU and restart the CPU after resolving the underlying fault. - Module Not Recognized
- The CPU does not recognize the output module in the configured slot, typically due to incorrect module type or slot assignment.
Verify the hardware configuration in STEP 5 matches the physical module placement. Ensure the correct module order number is assigned to the slot. - Overtemperature Warning
- The module has exceeded its rated operating temperature, risking output shutdown or damage.
Check cabinet ventilation and ambient temperature. Ensure subrack fans are operational and that the module is not overloaded beyond its rated total output current.
Frequently Asked Questions
Which Siemens S5 CPU systems are compatible with the 6ES5441-7LA12?
The 6ES5441-7LA12 is compatible with the SIMATIC S5-115U, S5-135U, and S5-155U central processing units when installed in the appropriate S5 subrack.
What is the output voltage and current rating per channel?
Each channel provides 24 V DC at up to 0.5 A, with a maximum total output current of 4 A across all 32 channels.
Are the outputs sourcing or sinking type?
The outputs are transistor-based sourcing (PNP) type, suitable for connecting to standard 24 V DC actuators, solenoids, and indicator lamps.
Can this module be programmed using STEP 7?
No, the SIMATIC S5 series uses STEP 5 programming software. STEP 7 is used for the newer S7 series and is not compatible with S5 hardware.
Does the module provide per-channel status indication?
Yes, the 6ES5441-7LA12 is equipped with an LED indicator for each of the 32 output channels, allowing visual status monitoring during operation and fault diagnosis.
Troubleshooting
All outputs remain de-energized despite CPU being in RUN mode
Check whether the CPU has the module correctly configured in the STEP 5 hardware configuration. Verify the module is properly seated in the subrack and that the backplane bus connectors are clean and undamaged.
Reseat the module in the subrack slot. If the issue persists, swap the module with a known-good unit to determine whether the fault lies with the module or the subrack slot.
One group of 8 outputs is not switching while others operate normally
Inspect the common terminal for the affected output group. Measure supply voltage at the group's common connection and check for a blown fuse or wiring fault on the common line.
Restore the common supply voltage to the affected group. Replace any blown fuse in the output group supply circuit and verify field wiring connections are secure and correctly terminated.
LED indicators show outputs active but field devices do not operate
Measure the output voltage at the module terminals with a multimeter while the output is commanded ON. Compare with the expected 24 V DC level.
If voltage is present at the module terminals but the device does not operate, the fault lies in the field wiring or the actuator itself. Check wiring continuity and replace the faulty actuator or solenoid.
Module causes CPU to enter STOP mode upon insertion
The module may have an internal fault or may be incorrectly configured in the STEP 5 project. Check the CPU diagnostic buffer for the specific fault code generated at the time of STOP.
Review the STEP 5 hardware configuration to ensure the correct module type is assigned to the slot. If the configuration is correct, the module may be defective and should be replaced.
Outputs switch erratically or produce unexpected signals
Check for electrical noise on the 24 V DC supply rail. Measure supply voltage for ripple or voltage dips using an oscilloscope. Inspect field wiring for proximity to high-voltage or high-current cables.
Install appropriate filtering on the 24 V DC supply. Re-route field wiring away from noise sources and ensure proper grounding of the subrack and cabinet. Replace the module if internal damage from noise is suspected.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
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