Siemens 6ES5552-3UA11 Diagnostic Processor

This diagnostic processor monitors system health and detects faults automatically. The Siemens 6ES5552-3UA11 plugs into a dedicated slot in S5 racks. You can identify failing I/O modules and wiring issues quickly. Its intelligent firmware reduces troubleshooting time significantly.

Physical Dimensions and Hardware Layout

The Siemens 6ES5552-3UA11 measures 25.0 cm in overall width. Its total depth reaches 21.5 cm including the front panel. This diagnostic processor weighs approximately 0.82 kg. A metal housing provides excellent electromagnetic shielding. Three status LEDs indicate power, run, and fault conditions. The module occupies one standard S5 I/O slot.

Diagnostic Capabilities and Monitoring Functions

This processor continuously scans all I/O modules in the rack. The Siemens 6ES5552-3UA11 detects short circuits and wire breaks on digital inputs. It also monitors output module fuses and load supply voltages. The module stores fault events in an internal buffer. You can retrieve diagnostic data via a programmer or operator panel.

Parameter	Specification
Product Type	Diagnostic processor module
Product Family	SIMATIC S5
Supported Modules	Digital I/O, analog I/O, specialty
Diagnostic Functions	Short circuit, wire break, fuse failure, voltage monitoring
Fault Buffer Size	32 events
Scan Interval	100 ms per rack
Communication Interface	AS511 (15-pin D-sub)
Dimensions (W x H x D)	250 mm x 75 mm x 215 mm
Weight	0.82 kg (1.81 lbs)
Supply Voltage	5V DC from backplane
Backplane Current Draw	220 mA @ 5V DC
Power Dissipation	1.1 W typical
Internal Energy Storage	47 µF capacitor for fault buffer
Fault Buffer Type	EEPROM (non‑volatile)
Number of Components	1 main board, 1 processor, 1 buffer memory
LED Indicators	Power (green), run (green), fault (red)
Operating Temperature	0°C to +60°C

Energy Storage and Fault Logging

Internal capacitors maintain fault buffer during brief power dips. The Siemens 6ES5552-3UA11 stores all fault data in non‑volatile EEPROM. This buffer retains up to 32 time-stamped events. Consequently, you can review failures even after power cycling the system.

System Integration and Configuration

You configure this processor using STEP 5 software. The Siemens 6ES5552-3UA11 requires parameter assignment in the CPU’s data block. Assign which modules to monitor and which faults to detect. The module sends diagnostic interrupts to the CPU upon fault detection. Therefore, your program can respond to failures automatically.

Fault Retrieval and Troubleshooting

Connect a programmer to the module’s 15-pin D‑sub port. The Siemens 6ES5552-3UA11 displays fault messages in plain text. Each message includes the rack number, slot number, and fault type. This information points directly to the problematic field device. Consequently, maintenance personnel save hours of troubleshooting time.