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Module Overview
This digital input module accepts 16 AC voltage signals from field devices. You can install Siemens 6ES5420-7LA11 directly into any SIMATIC S5 rack slot. The unit monitors switches, sensors, and limit switches on AC control circuits. It provides optical isolation between field wiring and the PLC backplane.
Technical Specifications
| Parameter | Value |
|---|---|
| Dimensions (W x H x D) | 250 mm x 25 mm x 130 mm |
| Weight | 0.48 kg |
| Number of inputs | 16 points |
| Input voltage range | 93V to 132V AC (nominal 110V AC) |
| Input frequency | 50 Hz or 60 Hz |
| Input current per channel | 6 mA typical at 110V AC |
| Response time (ON to OFF) | 25 ms maximum |
| Response time (OFF to ON) | 15 ms maximum |
| Isolation voltage | 1500V RMS (field to logic) |
| Input indication | 1 red LED per channel |
| Interface to backplane | S5 6ES5 backplane connector |
| Field wiring interface | Screw terminal block (removable) |
| Total onboard components | 156 discrete parts |
| Energy storage type | Ceramic and film capacitors |
| Energy storage rating | 180 µF at 200V DC |
| Operating temperature | 0°C to +60°C |
Board Layout and Components
The PCB arranges 16 input channels in two rows of eight. Each channel includes a bridge rectifier and optoisolator circuit. Moreover, 156 discrete components provide filtering and voltage limiting for AC signals. Film capacitors filter out high-frequency noise on each input. Consequently, the module rejects electrical interference from contactors and motors.
Installation Process
You can mount Siemens 6ES5420-7LA11 into any standard SIMATIC S5 rack slot. The backplane connector supplies power and transfers input status to the CPU. Furthermore, the removable terminal block accepts field wiring for all 16 points. Red LEDs on the front panel show each input’s ON condition clearly.
Performance Advantages
This module operates on standard 110V AC industrial control circuits. The 15 ms turn-on time filters out contact bounce effectively. Therefore, field switches connect directly without external interface relays. The 1500V isolation also protects the PLC from line voltage surges.
Safety and Compliance
Siemens 6ES5420-7LA11 meets CE and RoHS industrial standards. The board discharges stored energy below 5V within six seconds. Hence, technicians face minimal electrical risk during maintenance or replacement.