Siemens 6ES5324-3UA12 I/O Module

Technical Specifications and Mixed I/O Design

This input/output module combines digital inputs and outputs in a single unit for SIMATIC S5. The Siemens 6ES5324-3UA12 saves valuable rack space by mixing signal types. You can install this compact unit into any standard S5-115U or S5-135U rack slot. Its versatile design suits applications with limited I/O requirements. The module weighs approximately 0.47 kilograms. Its dimensions measure 25 cm in height, 5 cm in width, and 21 cm in depth.

Parameter	Specification
Brand	Siemens
Model	6ES5324-3UA12
Category	Input/Output Module / Mixed I/O Unit
Weight	0.47 kg
Height	25 cm
Width	5 cm (single slot)
Depth	21 cm
Number of Inputs	8 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
Number of Outputs	8 points
Output Type	Transistor (sourcing)
Output Voltage Range	20-30V DC
Output Current per Point	0.5 Amps maximum
Response Time (Input)	3 milliseconds typical
Response Time (Output)	0.2 milliseconds typical
Isolation Voltage	500V AC between field and logic
Energy Storage	None (no battery)
Component Count	Single PCB with 8 inputs, 8 outputs, optocouplers

Input Section and Signal Processing

The eight input channels interface with standard 24V DC field devices. Each channel uses an optocoupler for complete electrical isolation from the backplane. The Siemens 6ES5324-3UA12 includes built-in filtering for electrical noise rejection. A green LED indicates the status of each active input point clearly. The inputs respond within 3 milliseconds to any voltage change. This response captures short-duration events from proximity sensors effectively. The module reads all eight inputs during each scan cycle.

Output Section and Load Driving

The eight output channels drive solenoids, relays, and indicator lamps directly. Each output includes short-circuit protection and automatic current limiting. The Siemens 6ES5324-3UA12 provides a yellow LED for each active output point. The transistors switch within 0.2 milliseconds of the CPU command. Consequently, the outputs respond faster than relay-based alternatives. Each output can drive loads up to 0.5 Amps continuously. The total module output current must not exceed 3 Amps.

Installation and Wiring Guidelines

You must insert this module into any standard S5 I/O rack slot. The backplane supplies 5V DC power to both input and output circuits. The module draws approximately 160 mA from the 5V supply rail. It uses a front-panel screw terminal strip for all field wiring connections. You should use separate cables for input and output circuits. This practice prevents noise coupling from outputs back to inputs. The Siemens 6ES5324-3UA12 stores no I/O states during power loss. Therefore, all outputs return to OFF after each power-up cycle.