Siemens 505-4208A 110 VAC Input Module

Siemens PPX:505-4208A is an eight-channel digital input module for TI 505 PLCs, designed for 110 VAC signals and packaged as a single-wide card with floating inputs. Each of the eight IEC Type 1 inputs has an ON threshold from 79.0 VAC to 132.0 VAC and an OFF threshold from 0.0 VAC to 20.0 VAC, drawing 4.0–15.0 mA when ON and up to 1.5 mA when OFF, with a 6.0–30.0 ms response delay and a power draw of about 2.0 W from the base. The module is rated for a nominal 100–115 VAC input (110 VAC typical) and 47–63 Hz operation, making it suitable for interfacing sensors or switches—such as limit switches or door interlocks—with TI 505 controllers in industrial automation environments.