The IC225SDL720 occupies the mid-range position in the PACSafe output module family, delivering 2 OSSD pairs that provide 4 independently controlled PNP safety outputs. With a SISTEMA PFHd of 5.8 × 10⁻¹⁰, it meets the same SIL3/PL e safety integrity as the rest of the series while matching the output count most commonly needed in medium-complexity machine cells.

How many safety outputs does a typical machine cell need?

Many standalone machines — packaging units, pick-and-place cells, CNC workstations — require 3 to 5 safe outputs to cover guard door interlocks, E-Stop zones, and safe torque off (STO) signals. The IC225SDL720 maps naturally to this requirement: two OSSD pairs cover two primary safety zones, with the option to split each pair for up to 4 single-channel zones. For larger systems with 6 or more zones, the 8-output IC225SDL740 eliminates the need for a second module.

How does expansion work in the PACSafe system?

When connected to an expandable PACSafe base controller such as the IC225SXE262, the SDL720 operates as an I/O expansion module on the Ethernet backplane. Up to 8 expansion modules can be added to a single controller — scaling from 4 safe outputs to a maximum of 154 safety I/O points across input, output, and interface modules. Configuration is unified in PAC Machine Edition, where all modules appear in a single icon-based programming canvas.