SIEMENS SIMATIC PLC S7-400 6ES7421-5EH00-0AA0 SM421 DI 16 x AC 120V
Digital input module
The SIEMENS SIMATIC PLC S7-400 6ES7421-5EH00-0AA0 SM421 is a
digital input module designed for the S7-400 series of programmable
logic controllers. It is specifically designed to handle 16 digital
inputs operating at AC 120V.
Key Features:
- Input Type: Digital
- Number of Inputs: 16
- Voltage Rating: AC 120V
- Input Signal: On/Off signal for each input channel
- Input Response Time: Fast response time for real-time control
applications
- Diagnostic Functions: Built-in diagnostics for easy
troubleshooting and maintenance
- Compatibility: Compatible with the S7-400 PLC system
Applications:
The SIEMENS SIMATIC PLC S7-400 6ES7421-5EH00-0AA0 SM421 digital
input module is commonly used in various industrial applications
where monitoring and control of AC 120V digital signals are
required. Some typical applications include:
1. Manufacturing and Factory Automation: The module can be used to
monitor the status of machinery, equipment, and production
processes in manufacturing plants. It allows for real-time
monitoring and control of on/off signals from sensors, switches, or
other devices.
2. Process Control Systems: It can be utilized in process control
systems to monitor and control various industrial processes. This
includes applications such as temperature control, pressure
monitoring, and level sensing, where AC 120V digital signals are
involved.
3. Energy and Power Distribution: The module can be integrated into
energy and power distribution systems to monitor and control the
status of electrical equipment, such as circuit breakers or
switchgear. It allows for the detection of on/off signals and the
implementation of protective measures.
4. Building Automation: In building automation systems, the module
can be used to monitor and control various electrical devices and
systems, such as lighting control, HVAC systems, and security
systems. It enables the integration of digital signals from
switches, sensors, or detectors.
5. Water and Wastewater Treatment: The module can be applied in
water and wastewater treatment plants to monitor and control
various processes, including pump control, level monitoring, and
flow control. It allows for the detection of AC 120V digital
signals from sensors or switches.
These are just a few examples of the applications where the SIEMENS
SIMATIC PLC S7-400 6ES7421-5EH00-0AA0 SM421 digital input module
can be used. Its reliable performance, fast response time, and
compatibility with the S7-400 PLC system make it suitable for a
wide range of industrial automation applications.
Technical data
| SIMATIC S7-400, DIGITAL INPUT SM 421, OPTIC. ISOLATED, 16 DI, 120 V
AC, WITH 1 COMMON POINT |
| Supply voltage |
| Load voltage L1 |
| ● Rated value (AC) | 120 V |
| ● permissible range, lower limit (AC) | 74 V |
| ● permissible range, upper limit (AC) | 132 V |
| Input current |
| from backplane bus 5 V DC, max. | 100 mA |
| Power loss |
| Power loss, typ. | 3 W |
| Digital inputs |
| Number of digital inputs | 16 |
| Number of simultaneously controllable inputs |
| ● Number of simultaneously controllable inputs | 16 |
| Input voltage |
| ● Rated value (AC) | 120 V; 47 ... 63 Hz |
| ● for signal "0" | 0V AC to 20V AC |
| ● for signal "1" | 74V AC to 132V AC |
| Input current |
| ● for signal "0", max. (permissible quiescent current) | 4 mA; 0 to 4 mA |
| ● for signal "1", typ. | 6 mA; 6 to 20 mA |
| Input delay (for rated value of input voltage) |
| for standard inputs |
| — parameterizable | Yes |
| — at "0" to "1", min. | 2 ms |
| — at "0" to "1", max. | 15 ms |
| — at "1" to "0", min. | 5 ms |
| — at "1" to "0", max. | 25 ms |
| Cable length |
| ● shielded, max. | 1 000 m |
| ● unshielded, max. | 600 m |
| Encoder |
| Connectable encoders |
| ● 2-wire sensor | Yes |
| — permissible quiescent current (2-wire sensor), max. | 4 mA |
| Interrupts/diagnostics/status information |
| Diagnostics function | No |
| Diagnostics indication LED |
| ● Status indicator digital input (green) | Yes |
| Potential separation |
| Potential separation digital inputs |
| ● between the channels, in groups of | 1 |
| ● between the channels and backplane bus | Yes |
| Isolation |
| Isolation tested with | 1 500 V AC |
| Dimensions |
| Width | 25 mm |
| Height | 290 mm |
| Depth | 210 mm |
| Weights |
| Weight, approx. | 650 g |
