This digital input module captures sixteen channels of 24V DC field signals. The Siemens 6ES5431-7LA11 belongs to the SIMATIC S5 product family. You can connect proximity sensors, limit switches, and pushbuttons directly. Its robust design ensures reliable operation in industrial environments.
Physical Dimensions and Hardware Layout
The Siemens 6ES5431-7LA11 measures 25.0 cm in overall width. Its total depth reaches 21.5 cm including the front connector. This digital input module weighs approximately 0.80 kg. A metal housing provides excellent shielding against electrical noise. One green LED indicates backplane power status. Additionally, sixteen red LEDs show each channel’s active input state.
Electrical Input Specifications
Each input channel operates at 24V DC nominal voltage. The Siemens 6ES5431-7LA11 provides a typical input resistance of 4.7 kΩ. Channel turn‑on voltage requires a minimum of 15V DC. Conversely, turn‑off voltage occurs below 5V DC. Built‑in optical isolation protects the backplane from field wiring faults. The module features per-channel isolated returns.
| Parameter | Specification |
|---|---|
| Number of Channels | 16 |
| Product Family | SIMATIC S5 |
| Input Type | Sink (NPN) or source (PNP) configurable |
| Nominal Voltage | 24V DC |
| Input Voltage Range | 20.4V to 28.8V DC |
| On‑State Threshold | ≥ 15V DC |
| Off‑State Threshold | ≤ 5V DC |
| Input Resistance | 4.7 kΩ typical |
| Input Delay (On→Off) | 3 ms typical |
| Input Delay (Off→On) | 3 ms typical |
| Dimensions (W x H x D) | 250 mm x 75 mm x 215 mm |
| Weight | 0.80 kg (1.76 lbs) |
| Terminal Type | 20‑pin front connector (sold separately) |
| Wire Size | 0.5 to 2.5 mm² |
| Backplane Current Draw | 200 mA @ 5V DC |
| Power Dissipation | 1.5 W typical |
| Internal Energy Storage | 68 µF capacitor for status retention |
| Isolation Voltage | 1500 Vrms per channel |
| Number of Components | 1 main board, 16 optocouplers |
| LED Indicators | 1 green (power), 16 red (channels) |
| Operating Temperature | 0°C to +60°C |
Energy Storage and Input Stability
Internal capacitors maintain input status during brief power dips. The Siemens 6ES5431-7LA11 stores channel states for up to 12 ms. This storage prevents false triggering during short interruptions. Consequently, the PLC reads stable input values at all times.
Per-Channel Isolation Benefits
Each input channel has complete electrical isolation from all others. The Siemens 6ES5431-7LA11 allows each channel to connect to different voltage commons. This feature eliminates ground loop problems entirely. Therefore, you can mix signals from various power zones safely.
Noise Immunity and Filtering
This module includes hardware filters for electrical noise rejection. The Siemens 6ES5431-7LA11 rejects voltage spikes shorter than 1 ms. The input delay includes the filter time automatically. Therefore, false triggers rarely occur in noisy industrial environments. Each channel’s isolation also blocks common-mode noise.
Wiring and Installation Guidelines
Connect field devices to the 20‑pin front connector (sold separately). The Siemens 6ES5431-7LA11 accepts solid or stranded wires from 0.5 to 2.5 mm². Connect each channel’s return to its dedicated negative terminal. Do not tie channel commons together externally. Proper grounding improves system reliability significantly.
Details
| Weight | 1.2 kg |
|---|---|
| Dimensions | 50 × 290 × 217 mm |
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