Siemens 6ES7651-5CX58-0YK5 Digital Input

High-Density Digital Input for SIMATIC Systems

This electronic module provides 32 digital input channels for high-density signal acquisition. It captures 24 V DC signals from field sensors and switches. Many plants deploy this unit for large-scale discrete monitoring applications. The module offers comprehensive diagnostics and short-circuit protection.

Technical Specifications

Parameter	Specification
Model	6ES7651-5CX58-0YK5
Dimensions	50 mm × 290 mm × 217 mm (W × H × D)
Weight	0.65 kg
Power Supply	24 V DC (from backplane bus)
Power Consumption	6 W typical
Input Channels	32 digital inputs (24 V DC)
Input Voltage Range	0 V to 30 V DC
Input ON Threshold	≥ 15 V DC (at 3 mA)
Input OFF Threshold	≤ 5 V DC (at 0.5 mA)
Input Current	3.5 mA typical at 24 V DC
Input Delay	0.5 ms to 15 ms (programmable)
Input Type	Sink/Source (configurable per group)
Isolation Voltage	1,500 V AC (channel-to-bus)
Diagnostic Functions	Wire-break detection, short-circuit detection
Status Indicators	32 LED indicators (one per channel)
Terminal Type	37-pin D-sub connectors
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +70°C
Humidity Range	5% to 95% RH (non-condensing)
Protection Class	IP20
Certifications	CE, UL, cULus, FM

Input Channel Configuration

This module provides 32 independent digital input channels. Each channel accepts 24 V DC signals from switches and sensors. Inputs support both sink and source wiring configurations. This flexibility accommodates various field device types.

Signal Detection and Thresholds

The ON threshold of 15 V ensures reliable signal detection. The OFF threshold of 5 V prevents false triggering. Hysteresis between thresholds provides noise immunity. Input current at 24 V DC remains at 3.5 mA.

Diagnostic Capabilities and Fault Detection

Onboard diagnostics detect wire-breaks and short-circuits on inputs. The module reports faults to the CPU for alarm generation. Engineers receive immediate notification of wiring issues. This reduces troubleshooting time and improves plant uptime.

Input Filtering and Delay Configuration

Programmable input delays from 0.5 ms to 15 ms filter noise. Users select values per channel for specific applications. Shorter delays support high-speed counting and interrupts. Longer delays provide switch debouncing for contact inputs.

High-Density Design

The module packs 32 channels in a single slot for space efficiency. This density reduces rack space requirements significantly. Users can install multiple modules for large systems. The design suits applications with many discrete signals.

Mechanical Construction and Physical Attributes

This module measures 50 mm wide and weighs 0.65 kg. The standard SIMATIC form factor fits system racks. Two 37-pin D-sub connectors provide field signal interface. The module mounts securely using built-in guides.

Status Indication and Visual Feedback

Thirty-two LEDs display the state of every input channel. Green LEDs indicate active input signals. This comprehensive feedback assists commissioning and troubleshooting. Technicians quickly identify wiring problems from the front panel.

Certifications and Compliance

The 6ES7651-5CX58-0YK5 holds CE, UL, cULus, and FM certifications. These approvals confirm compliance with international industrial standards. Each module undergoes factory testing before shipment. This quality assurance ensures reliable performance.