Siemens 6ES5436-4UA11 | SIMATIC S5 Digital Input Module

The Siemens 6ES5436-4UA11 monitors 32 digital input points with 24V DC logic. This high-density module saves valuable rack space in SIMATIC S5 systems. You can connect pushbuttons, limit switches, and proximity sensors directly. It filters electrical noise to ensure reliable signal detection for your PLC. Consequently, this card suits applications requiring many input points in a single slot.

Technical Specifications Overview

Parameter	Detailed Specification
Model	Siemens 6ES5436-4UA11
Category	SIMATIC S5 Digital Input Module (High-Density)
Number of Inputs	32 (grouped in 4 groups of 8)
Rated Input Voltage	24V DC (20.4V to 28.8V)
Input Current	7 mA per channel (typical)
Input Delay	3 ms (fixed, for contact debouncing)
Signal 0 (Off)	-3V to +5V DC
Signal 1 (On)	15V to 30V DC
Isolation Voltage	500V AC (between groups and backplane)
Internal Power Draw	200 mA from 5V backplane
External Supply	24V DC for each input group (external)
Dimensions	250 mm x 25 mm x 130 mm (single-width)
Weight	0.45 kg (450 grams)
Front Connector	Requires Siemens 6ES5497-4UB12 (20-pin screw type)
Indicators	32 green LEDs (one per channel)
Operating Temperature	0°C to 60°C

Functional Features and Input Processing

The Siemens 6ES5436-4UA11 uses optocoupler isolation for reliable signal separation. You can connect sensors from different power supplies to each group. The onboard filter removes contact bounce and electromagnetic interference effectively. Furthermore, the module stores the complete input image for immediate CPU access.

Each of the four groups shares a common return terminal (COM). Therefore, you need separate neutrals for electrically isolated sensor circuits. The 32 green LEDs show real-time status changes on the front panel. You can monitor these lights for quick troubleshooting without any programming tool.

Installation and Wiring Guidelines

First, install a compatible frontal connector on the Siemens 6ES5436-4UA11. Next, insert the module firmly into any standard S5 rack slot. Then, connect external 24V DC supplies to each group terminal. Finally, wire your field devices to the appropriate input pin numbers.

You should use shielded cables for runs longer than 30 meters. The module does not provide internal power for two-wire sensors. Therefore, you must supply loop power from an external source. Always fuse each 24V supply line for short-circuit protection.

This digital input module works perfectly for high-density PLC applications. It pairs well with emergency stops, selector switches, and photoelectric sensors. The Siemens 6ES5436-4UA11 reduces rack space by packing 32 inputs into one slot. You can replace the module without disconnecting the frontal wiring harness.