Where I can find manual of Siemens S5 IP242 high speed counter module with P/N 6ES5 242-1AA13 ? I found one manual for IP242 at Siemens website but when look into detail, this manual is for 6ES5 242-1AA32 AND 6ES5 242-1AA41 which are IP242 A/B and look newer that the part I'm looking for.