Brand:Siemens Item No.:6ES7521-1FH00-0AA0 Product Origin:Germany Product Dimensions:35 × 147 × 129 mm Product Weight:0.342 kg Payment:T/T, Western Union, Credit Card Goods_stock:15 Shipping Port:Xiamen, China Lead Time:1-3 Days Condition:Brand New And Original Warranty:1 Year Certificate:COO
The Siemens 6ES7521-1FH00-0AA0 Digital Input Module is part of the SIMATIC S7-1500 SM 521 product family. It is designed for applications requiring the acquisition of 120/230 V AC digital signals, providing 16 input channels for monitoring compatible industrial control circuits and equipment states.
The module supports AC operation at 50/60 Hz and uses Type 1 input characteristics according to IEC 61131. Its input delay is approximately 20 ms, making it suitable for standard AC status monitoring rather than high-speed signal acquisition. The four groups of four channels and electrical isolation features support appropriate integration into industrial control architectures.
Designed for compatible SIMATIC S7-1500 and ET 200MP systems, the 6ES7521-1FH00-0AA0 can be used to monitor AC-powered equipment and control signals. A compatible front connector must be ordered separately. Before installation, confirm the input voltage, wiring arrangement, electrical safety requirements, and controller compatibility.
Technical Specifications
Parameter
Specification
Brand
Siemens
Model
6ES7521-1FH00-0AA0
Product Family
SIMATIC S7-1500 SM 521
Product Type
Digital Input Module
Module Designation
DI 16x230V AC BA
Number of Digital Inputs
16
Channel Arrangement
4 groups of 4
Rated Input Voltage
120/230 V AC
Input Frequency
50/60 Hz
Signal 0 Voltage Range
0–40 V AC
Signal 1 Voltage Range
79–264 V AC
Typical Input Current
11 mA at 230 V AC; 5.5 mA at 120 V AC
Input Delay
20 ms
Maximum Input Transition Delay
25 ms
Input Characteristic
Type 1, IEC 61131
Diagnostic Alarms
Not supported
Hardware Interrupts
Not supported
Front Connector
Screw-terminal or push-in type, ordered separately
Engineering Software
STEP 7 / compatible TIA Portal
Dimensions
35 × 147 × 129 mm
Weight
0.342 kg / 0.75 lb
Recommended Related Models
Siemens 6ES7521-1BL10-0AA0 – 32-channel, 24 V DC digital input module for standard DC signal acquisition.
Siemens 6ES7521-1BL00-0AB0 – 32-channel, 24 V DC high-feature digital input module.
Siemens 6ES7521-1BH00-0AB0 – 16-channel digital input module for compatible 24 V DC applications.
Siemens 6ES7522-1BL01-0AB0 – Digital output module for controlling compatible industrial loads.
Siemens 6ES7523-1BL00-0AA0 – Digital input/output module for combined signal acquisition and output control.
Popular Related Models
Siemens 6ES7521-1BL10-0AA0
Siemens 6ES7521-1BL00-0AB0
Siemens 6ES7521-1BH00-0AB0
Siemens 6ES7522-1BL01-0AB0
Siemens 6ES7523-1BL00-0AA0
Applications
The Siemens 6ES7521-1FH00-0AA0 is a SIMATIC S7-1500 SM 521 digital input module designed to acquire AC signals from industrial equipment and monitoring circuits. Unlike standard 24 V DC digital input modules, this model supports 120/230 V AC input signals, making it suitable for applications where AC-powered control signals need to be monitored by a compatible PLC.
Typical applications include:
Industrial Equipment Monitoring: Detecting the operating status of AC-powered machinery and devices.
Control Circuit Monitoring: Reading compatible 120 V or 230 V AC switching signals.
Production Line Automation: Monitoring equipment states and control signals in manufacturing environments.
Building and Utility Systems: Integrating compatible AC status signals into PLC-based monitoring systems.
Electrical Cabinet Applications: Collecting AC input signals in suitable industrial control installations.
SIMATIC S7-1500 Integration: Expanding the AC digital input capacity of compatible automation systems.
Advantages
16 Digital Input Channels: Provides 16 AC input points arranged in four groups of four.
120/230 V AC Compatibility: Supports common AC control signal levels at 50/60 Hz.
Electrical Isolation: Provides isolation between input channels and the backplane bus, as well as between channel circuits according to the specified design.
Type 1 Input Characteristics: Follows IEC 61131 input characteristics for compatible AC signal acquisition.
Defined Input Response: Uses a fixed input delay of approximately 20 ms.
Flexible Wiring Options: Supports separately ordered front connectors with screw terminals or push-in connections.
SIMATIC Integration: Designed for compatible S7-1500 and ET 200MP automation configurations.
Technical FAQs
Q1: What is the Siemens 6ES7521-1FH00-0AA0?
It is a SIMATIC S7-1500 SM 521 digital input module, designated DI 16x230V AC BA, for monitoring AC digital signals.
Q2: How many digital inputs does the module provide?
It provides 16 digital input channels arranged in four groups of four.
Q3: What input voltage does this module support?
It supports 120/230 V AC signals at 50/60 Hz.
Q4: What voltage range is recognized as a logical high signal?
The specified signal-high range is approximately 79–264 V AC. Signals between 0 and 40 V AC are recognized as logical low.
Q5: What is the typical input current?
The typical input current is approximately 11 mA at 230 V AC and 5.5 mA at 120 V AC.
Q6: What is the input delay?
The module has a fixed input delay of approximately 20 ms, with a maximum specified response delay of 25 ms for both signal transitions.
Q7: Can this module be used with 24 V DC sensors?
No. It is designed for AC input signals and should not be treated as a substitute for a 24 V DC digital input module.
Q8: Does the module provide diagnostic alarms or hardware interrupts?
This basic module does not provide diagnostic alarms or hardware interrupt functions.
Q9: Which engineering software supports this module?
It can be configured with compatible STEP 7 engineering software, including TIA Portal V12 or later environments that support the module.
Q10: What should be checked before installation or replacement?
Verify the AC signal voltage, frequency, channel grouping, electrical isolation requirements, front connector type, mounting compatibility, and PLC configuration.
