The Siemens 6ES5535-3LB12 is a digital input module belonging to the legacy SIMATIC S5 series, a pioneering programmable logic controller (PLC) family widely used in industrial automation from the late 1970s to the early 2000s. Below is the detailed information compiled from historical technical documentation and industry archives:
- Product Series: SIMATIC S5 (S5-115U/135U/155U systems, typical for modular S5 PLC configurations)
- Module Type: Digital Input Module (24V DC, 16-channel)
- Product Status: Obsolete/DiscontinuedSiemens has phased out the S5 series, with support and spare parts gradually discontinued. Modern replacements typically belong to the SIMATIC S7-300/400 or TIA Portal-compatible product lines.
- Dimensions (W×H×D): ~40 mm × 130 mm × 180 mm (standard S5 module form factor, varies slightly by system)
- Weight: Approximately 0.3 kg
- Operating Temperature: 0°C to +60°C (non-condensing)
- Storage Temperature: -20°C to +80°C
- Protection Rating: IP20 (for panel-mounted use within a control cabinet, not for direct field installation)
- Mounting: Installed in the S5 PLC’s rack via the backplane bus connector (no tools required for insertion)
As a digital input module, it converts discrete 24V DC signals from field devices (e.g., limit switches, proximity sensors, pushbuttons) into logic-level signals readable by the S5 PLC’s central processing unit (CPU). Key functions include:
- Isolating field-side electrical noise from the PLC’s logic circuit to ensure signal stability.
- Supporting high-density input monitoring (16 channels in a single module) to optimize rack space in control cabinets.
It was widely deployed in mature industrial environments such as manufacturing lines, material handling systems, and process control applications (e.g., automotive assembly, food processing) before the S5 series was superseded by the S7 platform.
- Obsolescence: For maintenance or replacement, Siemens recommends migrating to the SIMATIC S7-300/400 series with compatible digital input modules (e.g., 6ES7 321-1BH02-0AA0 for S7-300) and adapting wiring via transition kits.
- Documentation: Detailed historical manuals (e.g., "SIMATIC S5-115U/135U/155U Module Data") are available in Siemens’ legacy support archives upon request.
For the most accurate legacy product details, contact Siemens Industrial Support with the full module part number.
