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The 6ES5420-4UA14 functions as a discrete input module for the Siemens SIMATIC S5 PLC system. This unit accepts signals from up to sixteen field devices such as sensors and switches. It converts these field signals into logic levels for the CPU processing. Therefore, this module enables reliable data acquisition for legacy automation systems.
Technical Specifications
We engineered this input module for demanding industrial sensing applications. Its compact single-slot design fits directly into a standard S5 rack. Moreover, the module includes optical isolation between field and logic circuits.
| Parameter | Specification |
|---|---|
| Dimensions (H x W x D) | 8.9 x 1.5 x 5.1 inches (226 x 38 x 130 mm) |
| Weight | 0.45 kg (1.0 lbs) |
| Input Channels | 16 discrete inputs |
| Input Type | Sourcing (positive logic) DC |
| Input Voltage Range | 24V DC nominal (20-30V DC) |
| Input Current | 7 mA typical at 24V DC |
| On-State Voltage | > 15V DC |
| Off-State Voltage | < 5V DC |
| Input Delay | 3 ms typical (configurable) |
| Number of Commons | 2 commons with 8 points each |
| Isolation | 500V AC between channels and backplane |
| Internal Power Draw | 50 mA from 5V DC backplane |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
Input Circuit Design
The 6ES5420-4UA14 uses optocoupler technology for each of its sixteen inputs. Each channel accepts 24V DC signals from standard industrial sensors. Individual LED indicators show the status of every input point immediately. Consequently, you can troubleshoot field wiring without any external test equipment.
Signal Processing and Response Time
This input module filters each signal to reject electrical noise from the field. The default input delay equals 3 milliseconds for most applications. You can configure longer delays for extremely noisy environments. Therefore, this module provides clean, bounce-free signals to the CPU for processing.
Input Voltage Characteristics
The 6ES5420-4UA14 recognizes any voltage above 15V DC as a logic one. Voltages below 5V DC register as a logic zero to the CPU. The module draws only 7 mA per channel, minimizing load on sensor power supplies. Hence, you can connect many sensors to the same 24V DC power source without overloading it.
Power Requirements and Energy Storage
This module draws 50 mA from the 5V DC backplane supply only. It does not require any external 24V power for internal logic operation. The module contains no battery or capacitor energy storage components. All input states update in real time without any data retention after power loss.
Isolation and Noise Immunity
The 6ES5420-4UA14 provides optical isolation between field and logic circuits. This isolation withstands 500V AC between inputs and the backplane. Each input channel shares a common with seven other points. Therefore, you can wire sensors from two different voltage groups on the same module.
Installation and Wiring
Mount the 6ES5420-4UA14 into any SIMATIC S5 rack slot securely. Connect your field devices to the screw terminal block using 18 AWG wire. Use a 3.0 mm flat-blade screwdriver for all terminal screw connections. Verify each common connection matches your sensor voltage requirements before applying power. Always turn off system power before inserting or removing this module.