Siemens 6ES5441-5AA12 Digital Output Module

The Siemens 6ES5441-5AA12 Digital Output Module provides 16 transistor outputs for SIMATIC S5 systems. This module switches 24 VDC loads directly from the backplane. You will find it in factory automation applications like conveyors and sorting machines. It offers optical isolation between field wiring and the logic circuits. Therefore, this module protects the CPU from electrical noise and surges.

The Siemens 6ES5441-5AA12 Digital Output Module measures 230 mm in height and 48 mm in width. Its depth reaches 180 mm for standard rack mounting. The unit weighs approximately 0.68 kilograms. It contains 16 power transistors with integrated protection. Each channel provides 0.5 amps of sourcing current. Additionally, you get 16 status LEDs for visual indication.

Key Technical Specifications

Parameter	Value
Manufacturer	Siemens AG
Model	6ES5441-5AA12
Product Type	Digital Output Module
Number of Outputs	16 (sourcing)
Output Voltage	24 VDC (20.4-28.8 VDC)
Output Current	0.5 A per channel
Total Current	8 A (maximum)
Off-State Leakage	0.1 mA maximum
Response Time	1 ms (on/off)
Internal Drivers	16 (NPN transistors)
Protection	Short circuit, overtemp
Height	230 mm
Width	48 mm
Depth	180 mm
Weight	0.68 kg
Status LEDs	16 (green)
Energy Storage	≈ 200 µF (capacitive)
Power Consumption	250 mA @ 5 VDC
Operating Temperature	0°C to +60°C
Terminal Type	Screw (20-pin)

Internal Architecture and Energy Storage

The Siemens 6ES5441-5AA12 Digital Output Module stores minimal energy in its output suppressor circuits. Small ceramic capacitors hold approximately 200 microfarads total capacitance. Each output channel uses an NPN power transistor in sourcing configuration. This configuration connects the output to +24 VDC when active. Sixteen optocouplers isolate the logic backplane from field outputs. When the CPU turns on a channel, the optocoupler activates. The transistor then switches the output to 24 VDC potential. Each channel includes a flyback diode for inductive load protection. This diode safely dissipates energy from relays or solenoids. Sixteen green LEDs light up when their respective output turns on.

Connection Interfaces and Wiring Details

You will find a 20-pin removable terminal block on the bottom face. This block accepts 16 output wires plus four common return terminals. Connect the external 24 VDC supply positive to each load first. Then, connect each load return wire to the output terminal. Use 16 to 22 AWG copper wire for all field connections. The Siemens 6ES5441-5AA12 Digital Output Module requires an external 24 VDC power supply. Do not exceed 0.5 amps per channel or 8 amps total. Sixteen green LEDs provide quick visual feedback for troubleshooting. A green PWR LED indicates proper backplane power.

Configuration and Installation Steps

You slide this module into any I/O slot of the SIMATIC S5 rack. First, align the module with the upper and lower card guides. Then, push it firmly until the backplane connector seats completely. Secure the front panel with the two retaining screws. Connect all field wiring before applying power to the system. The Siemens 6ES5441-5AA12 Digital Output Module requires no jumpers or dip switch settings. Use the STEP 5 software to control each output point individually. The module draws 250 mA from the +5 VDC backplane supply. Always install a suppression diode across each inductive load. Test each output with a multimeter before connecting expensive equipment.