Siemens 6ES7552-1AA00-0AB0 SIMATIC S7-1500 TM Timer DIDQ 16x24V Time-Stamped I/O Module

The Siemens 6ES7552-1AA00-0AB0 is a SIMATIC S7-1500 TM Timer DIDQ 16x24V module providing up to 8 time-stamped digital inputs and 16 digital outputs, up to 16 of which carry a time stamp, at 24 V DC, with integrated counting, PWM, and oversampling functions. It runs on two separate 24 V DC load voltages and mounts directly on the S7-1500 rail.

Technical Specifications

Selection Notes

Up to 16 of the digital outputs and up to 8 of the digital inputs can carry a hardware time stamp, so event sequencing on fast machine cycles does not depend on the CPU scan cycle catching the edge. PWM output and oversampling on the DQ side let a single channel generate a pulse train or sample faster than the base cycle time, useful where a standard fixed-sample DI/DQ module would miss short pulses. Four integrated counters, up to 200 kHz with quadruple evaluation on 24 V incremental encoders, cover speed or position feedback from simple 2-wire proximity sensors without a dedicated high-speed counting module. Two separate 24 V load-voltage groups, 1L+ for inputs and 2L+ for the encoder and output side, let a fault on one circuit be cleared without dropping the other.

Applications

Event logging and fast sequencing where the timing of a digital signal edge matters, such as packaging machines correlating a sensor trip with an actuator response, or PWM-driven valve control combined with time-stamped feedback for diagnostics.