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6ES5944-7UA21


The 6ES5944-7UA21 is a high-density digital input module for Siemens' SIMATIC S5-100U/115U/135U/155U PLC systems, designed for reliable signal acquisition in industrial automation applications. This module provides 32 isolated input channels in a compact form factor.

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1. General Data
Parameter Specification
Product Name SIMATIC S5 Digital Input Module
Order Number 6ES5944-7UA21
Module Type 32-Channel Digital Input
Series SIMATIC S5-100U/115U/135U/155U
Status Discontinued (Legacy Product)
2. Input Specifications
Parameter Specification
Number of Inputs 32 (isolated in groups)
Input Voltage 24V DC (Nominal)
Voltage Range 15-30V DC
Input Current Typically 7mA per channel
Filter Time Adjustable (1ms/5ms/10ms)
Isolation 500V AC (channel-to-backplane)
3. Electrical Characteristics
Parameter Specification
Power Supply 5V DC (from S5 backplane)
Power Consumption 1.2W (typical)
Connection Type Screw terminals (front-mounted)
4. Mechanical & Environmental
Parameter Specification
Dimensions (W×H×D) 50 × 125 × 120 mm
Weight ~300g
Protection Class IP20 (cabinet installation)
Operating Temp. 0°C to +60°C
Storage Temp. -40°C to +70°C
5. Diagnostics & Indicators
✔ Per-channel LED status (green = active input)
✔ Group fault indication

6. Compatibility
Designed for SIMATIC S5-100U/115U/135U/155U PLCs

Requires S5 compatible rack/power supply

7. Certifications
CE, UL, cULus (where applicable)

RoHS Compliant

Typical Applications
Machine control systems

Process automation

Legacy S5 system maintenance

Modern Alternatives
⚠ Note: This module is discontinued. For current systems, consider:

S7-300 Digital Input Modules (e.g., 6ES7321-1BH02-0AA0)

ET 200SP Distributed I/O

Why Was This Module Used?
✔ High-density input (32 channels in compact space)
✔ Reliable isolation for industrial environments
✔ Easy integration with S5 PLC systems