Product Overview

The 6ES5430-7LA12​ is a SIMATIC S5-430 series digital input module from Siemens, engineered for the standard-depth S5 rack line—specifically S5-115U/F central controllers (and by extension the wider S5-115U/135U/155U ecosystem where the 430-7 “floating” variant is specified). Where the compact S5 DI line (6ES5420) trades isolation for density in shallow 90U/95U/100U panels, the 6ES5430-7LA12​ goes the opposite direction: 32 inputs at 24 V DC in a single standard-rack slot, but with galvanic isolation implemented in groups of 8 via optocouplers, and a group-to-group isolation rating of 30 V (tested to 500 V per VDE 0160). This makes the 6ES5430-7LA12​ the default choice when the field side carries different 0 V references, when proximity to VFD/contactor noise demands optical isolation, or when the rack itself is a standard S5-115U/135U/155U where the compact modules physically will not seat.Each of the 32 inputs on the 6ES5430-7LA12​ accepts the industrial-standard 24 V DC sensor range: “0” signal = –30 to +5 V, “1” signal = +13 to +30 V, with a typical 8.5 mA input current on a valid “1”. Transition times are 0→1 typical 2.2 ms (max 4.6 ms) and 1→0 typical 4.5 ms (max 12 ms)—fast enough for most machine-prox and process-switch work, deliberately not so fast that contact bounce passes unattenuated. The module supports 2-wire BERO (Siemens branded inductive prox) with up to 1.5 mA quiescent current, and allows shielded cable runs up to 1000 m / unshielded up to 600 m, which matters on large S5-115U installations where field devices sit far from the central rack (bulk material yards, water-treatment spread-out skids, automotive body-shop zones). Internally the 6ES5430-7LA12​ draws ~5 mA from the 5 V backplane and dissipates ~6.5 W total—significantly more than the compact 4UA14 because of the optocoupler array and the deeper standard-rack drive stages. Physical footprint is standard S5: ~215 × 314 × 53 mm, ~0.78 kg, IP20 control-cabinet mount.Within the S5 standard-rack DI family, the 6ES5430-7LA12​ represents the 32-channel floating variant of the 430-7 sub-line. For MRO teams still supporting S5-115U/135U/155U racks in process plants, power generation balance-of-plant, legacy automotive lines and water utilities, the module is a recurring spare item: standard-rack DIs see heavy field-device churn (prox failures, shorted cables, transient spikes from incorrectly grounded solenoid commons) and having a verified 6ES5430-7LA12​ on the shelf avoids the “three-week lead-time from obsolete-stock broker” panic. The module has been discontinued by Siemens (end-of-life, customer-order class) but remains widely sourced through refurb/NOS channels—hence the marketing copy must treat it as a legacy spare, not an active-line new purchase.

Technical Specifications