Version Histories|PLC WorkShop for Square D Version History PLC WorkShop for Square D Version History v6.23: March 29, 2021 Version History V6.22: September 22, 2004 Version History V6.21: May 1, 2003 Version History V6.20: January 15, 2003 Version History V6.00: July 28, 1998 Version History