6ES7521-1BL00-0AB0 New Original Siemens S7-1500 Plc Programming Controller module

2. Key Selling Points

1. Digital I/O Combination Module for S7-1500 Series: Model DI2/DQ2 Transistor, a compact digital input/output module in the SIMATIC S7-1500 PLC system—integrates 2 digital inputs + 2 digital outputs in one unit, ideal for space-constrained or low-I/O-count applications.

2. 2-Channel Digital Inputs (DI): Supports 24 V DC signal input, compatible with pushbuttons, limit switches, and sensors for reliable acquisition of discrete status signals.

3. 2-Channel Digital Outputs (DQ): Features high-speed transistor outputs (source type) with up to 0.5 A per channel, capable of directly driving small relays, indicator lights, solenoid valves—offering fast response and long service life.

4. Channel-by-Channel Isolation & Protection: Both input and output channels provide channel-level galvanic isolation, with short-circuit and overload protection for enhanced system safety and reliability.

5. Flexible Configuration: Each channel can be individually configured in TIA Portal, including input filter time and safe output behavior (hold last state or set to safe state on power loss).