Overview
The SR3XT61B is a Schneider Zelio Logic digital I/O module, order code SR3XT61B, providing 4 digital inputs, 4 analog inputs, and 2 relay outputs in a compact DIN-rail housing with screw terminals and IP20 protection. It operates on a 24 V AC supply and draws 0.0044 A, with a cycle time of 6 to 90 ms and a response time of 50 ms.
The module performs a program memory check on each power-up, ensuring the loaded logic is intact before the controller begins scanning. The 6 to 90 ms cycle time covers the full scan range for small to medium logic blocks; the 50 ms response time governs how quickly the relay outputs react to input state changes. The relay outputs switch at a maximum current of 0.01 A and are rated for 0.1 Hz at rated load (10 Hz under no load). The 4 analog inputs accept 24 V AC signals, allowing direct connection of sensors or transmitters without an external signal conditioner, while the 4 digital inputs handle discrete 24 V AC signals from pushbuttons, limit switches, or proximity sensors.
Applications
The SR3XT61B fits into small machine control, building automation (lighting, HVAC, access), simple process skids, and OEM equipment where a mix of digital and analog I/O is needed in a single, DIN-rail-mounted module. Typical uses include conveyor interlocks, pump sequencing, and temperature monitoring with relay-driven alarms.