Siemens 505-7002 NSNBC01 Programmable Logic Controller

Siemens 505-7002 NSNBC01 is a SIMATIC 505 high-speed counter module (PPX:505-7002) that adds two independent counter channels to a SIMATIC 505 controller. Each channel supports four counting modes: a pulse counter and quadrature modes 1X, 2X, and 4X, enabling both simple pulse counting and encoder-style signals to be tracked in real time. The module handles up to 10 kHz, with a minimum pulse width of 25 µs, and provides four inputs—two count inputs plus reset and inhibit—and two field outputs, Y1 and Y2, each governed by a separate programmable preset. LED indicators display the status of the A and B count inputs and the Y1 and Y2 outputs for quick diagnostics. All inputs can be configured as sinking or sourcing when powered from an external 24 VDC supply, and the HSC module operates asynchronously from the controller scan, allowing independent counting that remains responsive to fast events. The NSNBC01 variant shares the documented feature set of the 505-7002 design, making it suitable for high-speed counting tasks in legacy SIMATIC 505 installations.