Siemens 505-4216A 110 VAC Digital Input Module

The Siemens TI505 505-4216A is a 16-channel digital input module for TI505 PLC systems, designed to accept 110 VAC signals in a compact single-wide form factor. It provides 16 discrete input points rated for 100–115 VAC, with an on-threshold of about 79 VAC minimum and a maximum on-threshold near 132 VAC, and an off-threshold range of 0–20 VAC. Each input draws 4–15 mA when ON and up to 1.5 mA when OFF, with a typical response delay of 6–30 ms and a logic transition time suited for standard 50/60 Hz environments (operating frequency 47–63 Hz). The module consumes about 2.0 W of power from the backplane base. As a single-wide TI505 I/O option, the 505-4216A is appropriate for reading AC-powered switches, sensors, or other 110 VAC devices into TI505 controllers in industrial automation, manufacturing lines, and similar control applications. The “A” variant is commonly described as incorporating enhanced noise filtering to improve performance in electrically noisy environments.