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Siemens PLC Digital Input SM 321, Potential Isolation, 32 DE 6ES7321-1EL00-0AA0
model:
Siemens S7-300 SM 321 6ES7321-1EL00-0AA0
SKU:
770005810154_6ES7321-1EL00-0AA0
Product Type :
Digital Input
MOQ:
1 Piece
原价为：$630.00。$525.20当前价格为：$525.20。
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Siemens 6ES7321-1EL00-0AA0 SM 321 Digital Input Module
A 32-channel digital input (DI) module for the SIMATIC S7-300 PLC system, designed for reading large quantities of 24V DC sensor signals with potential isolation for safe and reliable operation.
Key Specifications:
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Module Type: Digital Input (DI)
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Number of Channels: 32 channels
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Input Voltage: 24V DC (nominal), suitable for standard industrial sensors and switches.
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Electrical Isolation: Potential isolation between the backplane bus (PLC logic) and the field-side sensor circuits, protecting the CPU from electrical interference or faults.
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Connection: Via front 40-pin connector (requires separate connector, e.g., 6ES7392-1AJ00-0AA0).
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Diagnostics: No integrated channel-level diagnostics (simple status LEDs per channel).
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Mounting: Installs on a S7-300 DIN rail and connects to the central or expansion rack via a backplane bus.
Typical Applications:
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High-density sensor and switch monitoring (e.g., limit switches, pushbuttons, proximity sensors).
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Applications requiring electrical isolation between control logic and field devices for noise immunity or safety.
Note: This module requires an external 24V DC power supply for the field devices. The potential isolation is a key feature, as it electrically separates the internal electronics from the field wiring, enhancing system stability and protecting the CPU from ground loops or voltage spikes. It is a standard, high-density module for cost-effective I/O expansion in S7-300 systems
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