Product Overview

The Siemens 6ES5441-7LA11​ is a SIMATIC S5 Series Digital Output Module 441, delivering 32 non-isolated (non-floating) 24 V DC output channels at 0.5 A per channel, engineered for direct mounting in S5-115U, S5-154U, and S5-155U wide-format central and expansion racks (UR1, UR2, ER1, ER2). Within the S5 modular I/O hierarchy, the 6ES5441-7LA11​ occupies a single wide rack slot and drives 24 V DC field actuators — solenoid valves, indicator beacons, contactor-coil interposing relays, VFD “Run/Enable” 24 V DC aux circuits, and status tower-light segments — switching them from the S5 CPU’s process image on every OB1 scan.Positioned as the high-density 24 V DC transistor-output DO in the 441 family, the Siemens 6ES5441-7LA11​ organises its 32 channels into four groups of eight, each group sharing a common M return but with no galvanic isolation from the S5 backplane — the “non-floating” designation means the output L+/M must be derived from the same 24 V DC supply that feeds the S5 rack’s L+ bus (or a tightly referenced sibling PS), making it ideal for panels where all 24 V DC field loads already share the rack’s supply domain. Each group draws ~17 mA from L+ at no-load, while the module pulls ~10 mA from the 5 V backplane; electronic short-circuit protection is built into each channel group, limiting inductive kickback to ≤15 V on circuit interruption.Officially discontinued since 1 October 2005 (PLM PM500, deleted without replacement per Siemens), the Siemens 6ES5441-7LA11​ remains the correct native 32×24V DC DO for thousands of S5-115U/155U process cells in water treatment, bulk-material handling, building-materials batch, and power-plant auxiliary systems that have not migrated to S7. For these assets, the module is a bill-of-material necessity: keeping a cold spare per rack avoids a forced platform migration where rewiring 32 field points to a newer DO (ET 200SP, etc.) would cascade into a full rack, PS, and STEP 5 → TIA requalification project.

Technical Specifications