General 
Application 
The programming unit 631 is used for compilin 
and testing  STEP-5 user-programs for the 
SIMATIC-S5 programmable controllers 
55-010, 
-1lOA and -130 
A/K. 
The PU 631 permits programs to be written in 
either statement list 
(STL) or ladder diagram 
(LAD) 
formats of representation. 
Using a printer, the statement list, 
the ladder diagram and the cross reference 
list may be printed out. 
The built-in EPROM-programming unit enables 
programs to be stored on EPROM-modules.