anybody can help me to explain how can i use SFB19 / SFB20 / SFB20
let me describe more :
PLCs S7-400 and S7-300 connected to ethernet network . S7-connection defined between them and at each side ID number is clear.
so i want to stop S7-300 from S7-400 side by calling SFB20 in user program . Also i want to warm restart S7-300 from S7-400 side by calling SFB19 but none of these tests doesnot work !!!