Siemens 6ES5430-3BA11 Input Module | 16-Point 24V DC 0.45kg

Technical Specifications and Input Design

This digital input module interfaces with 24V DC field devices for Siemens SIMATIC S5 systems. The Siemens 6ES5430-3BA11 reads signals from pushbuttons, limit switches, and proximity sensors. You can install this unit into any S5 central rack or expansion unit. Its rugged design handles industrial electrical noise without false triggering. The module weighs approximately 0.45 kilograms. Its dimensions measure 25 cm in height, 5 cm in width, and 21 cm in depth.

Parameter	Specification
Brand	Siemens
Model	6ES5430-3BA11
Category	Digital Input Module / Discrete Input Unit
Weight	0.45 kg
Height	25 cm
Width	5 cm (single slot)
Depth	21 cm
Number of Inputs	16 points
Input Voltage Range	20-30V DC (nominal 24V DC)
Input Type	Sink (negative common)
Input Current per Point	7 mA typical at 24V DC
Minimum ON Voltage	15V DC
Maximum OFF Voltage	5V DC
Response Time	3 milliseconds typical
Isolation Voltage	500V AC between field and logic
Energy Storage	None (no battery or capacitors)
Component Count	Single PCB with 16 optocoupler circuits

Wiring and Group Configuration

The module divides its sixteen inputs into two isolated groups of eight. Each group shares a common return terminal for wiring convenience. You can connect different voltage sources to each group safely. The Siemens 6ES5430-3BA11 uses a front-panel screw terminal strip. This terminal strip accepts wire sizes from 0.2 to 1.5 square millimeters. Each input point includes a green LED status indicator. This LED lights brightly when the input detects a valid ON signal.

Signal Processing and Noise Immunity

The input circuits filter electrical noise for reliable industrial operation. Each channel requires at least 15V DC to register an ON condition. The module uses optocoupler technology for complete electrical isolation. Consequently, the backplane logic remains safe from field wiring faults. The inputs respond within 3 milliseconds to any voltage change. This rapid response captures short-duration events from high-speed sensors. The module operates perfectly with two-wire or three-wire DC sensors.

Installation and Operational Guidelines

You must insert this module into any standard S5 I/O slot position. The backplane supplies 5V DC power to the optocoupler circuits. The module draws approximately 100 mA from this backplane supply. It stores no input states when you remove system power. Therefore, the CPU receives fresh input data after each power-up cycle. You should verify the applied voltage stays below 30V DC. Exceeding this limit will permanently damage the input circuits.