Siemens 6ES7138-7FD00-0AB0 F-Module

The Siemens 6ES7138-7FD00-0AB0 functions as a fail-safe digital input module for the SIMATIC ET 200SP system. This module collects safety-related signals from emergency stop devices and light curtains. The unit achieves SIL 3 certification according to IEC 61508 for critical safety functions.

Technical Specifications

Parameter	Specification
Product Type	Fail-safe digital input module
System Compatibility	SIMATIC ET 200SP
Safety Certification	SIL 3 (IEC 61508), PL e (ISO 13849)
Number of Inputs	8 channels (fail-safe)
Input Voltage	24V DC (19.2V – 30V)
Input Current	4.5 mA per channel (typical)
Input Delay	2 ms (programmable to 25 ms)
Test Pulse Width	1 ms (for short-circuit detection)
Test Pulse Interval	Configurable (1–100 ms)
Isolation	500V DC (optocoupler per channel)
Dimensions (W x H x D)	85 x 70 x 60 mm
Weight	0.18 kg
Internal Components	8 x optocouplers, 2 x microcontrollers (redundant), 1 x watchdog
Diagnostic Memory	256 bytes (error logging)
Bus Connector	ET 200SP backplane (push-in)
Field Terminals	Spring-cage connectors (10 positions)
LED Indicators	8 x green (channel), 1 x red (fault), 1 x green (module OK)
Power Supply	24V DC (from backplane)
Power Consumption	24V / 40 mA (typical), 24V / 80 mA (maximum)
Operating Temperature	-30°C to +70°C
Storage Temperature	-40°C to +85°C
Protection Class	IP20
Mounting	ET 200SP base unit (plug-in)
Approvals	IEC 61508 (SIL 3), ISO 13849 (PL e), ATEX, UL, CSA

Certified Safety Input Acquisition

The Siemens 6ES7138-7FD00-0AB0 achieves SIL 3 certification for high-integrity safety applications. This certification meets the requirements of IEC 61508 and ISO 13849 standards. The module captures signals from emergency stop pushbuttons and safety interlock switches. Two redundant microcontrollers process each input for cross-checking.

Comprehensive Diagnostics and Fault Detection

The module performs continuous self-tests to detect internal faults and wiring errors. Test pulses of 1 ms duration detect short-circuits between channels or to ground. Programmable input delays from 2 ms to 25 ms filter contact bounce and electrical noise. Diagnostic memory stores 256 bytes of error data for troubleshooting.

Fast Response and Flexible Configuration

Input response times start at 2 ms for time-critical safety functions. Users can extend the input delay to 25 ms for noisy environments or mechanical contacts. The module accepts 19.2V to 30V DC for compatibility with industrial power supplies. Each channel draws only 4.5 mA for low power consumption.

ET 200SP Modular Integration

This fail-safe module plugs directly into ET 200SP base units for easy system expansion. The push-in backplane connector ensures reliable signal and power transfer. Spring-cage field terminals accept solid or stranded wires without tools. The module fits seamlessly into existing ET 200SP distributed I/O systems.

Compact Design for Space-Constrained Cabinets

The module measures 85 x 70 x 60 mm and weighs just 0.18 kg for lightweight installation. This compact footprint allows high-density mounting in control cabinets. Eight green LEDs show the status of each input channel individually. A red fault LED and green module OK LED provide at-a-glance diagnostics.

Wide Temperature Range for Demanding Environments

The Siemens 6ES7138-7FD00-0AB0 operates reliably from -30°C to +70°C ambient. This wide range suits outdoor installations and unheated industrial plants. Storage temperatures from -40°C to +85°C ensure long shelf life for spare modules. The module carries ATEX approval for potentially explosive atmospheres.