Detailed Description:
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Input Characteristics: Provides 8 channels of digital input, all designed to acquire standard industrial sensor signals at 24 V DC. The recognized voltage range for signal level “1” is typically 15V to 30V DC, and for signal level “0” it is typically -3V to +5V DC.
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Electrical Isolation: The input channels are optically isolated from the backplane bus, effectively suppressing external interference and protecting the PLC’s internal circuitry.
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Diagnostic Capability: The module features group diagnostics, capable of detecting a loss of supply voltage (sensor power). It can trigger an alarm in the system configuration software (e.g., TIA Portal) for rapid troubleshooting.
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Interrupt Function: Supports the configuration of hardware interrupts for all input channels in the engineering software. This allows the CPU to be notified immediately upon detecting a rising or falling edge, enabling fast response times.
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Compact Design: The module has a width of only 35 mm. It can be flexibly mounted to the right side of an S7-1200 CPU for expansion. It connects mechanically and electrically to the preceding module via an integrated U-type connector, eliminating the need for additional wiring.
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Status Indication: Each input channel has an independent green LED to indicate its signal status (ON/OFF). The module also features a DIAG LED to indicate the overall module operating status.
Key Specifications:
| Parameter | Details |
|---|---|
| Model | 6ES7221-1BF32-0XB0 |
| Series | SIMATIC S7-1200 |
| Module Type | Digital Input (DI) |
| Number of Channels | 8 |
| Rated Input Voltage | 24 V DC (sink/source通用, common is M) |
| Signal “1” Range | 15 V DC to 30 V DC (typical) |
| Signal “0” Range | -3 V DC to +5 V DC (typical) |
| Input Delay Time | Configurable (0.1 ms / 0.8 ms / 3.0 ms / 12.8 ms / 20.0 ms) |
| Backplane Bus Current Consumption | Typically 40 mA |
| Power Loss | Typically 1.6 W |
| Isolation | Optical isolation between channels and backplane bus |
| Diagnostics | Loss of supply voltage (L+ to M) |
| Interrupt | Hardware interrupt (rising/falling edge) |
| Width | 35 mm |
| Required Engineering Software | TIA Portal (STEP 7 Basic/Professional) |
