Siemens SIMATIC S5 Manual page 261

Start-up procedure with the S5-135U
Following a cold restart (OB 20) cyclic program execution begins at the start of OB 1.
With the warm restarts OB 21 (manual warm restart) or OB 22 (automatic warm restart) program
execution is continued from the point of interruption after the start-up OBs have been run through.
When using the IP 244 temperature controller module in the S5 135U, neither manual nor automatic
warm restart is permitted.
The function "automatic warm restart" must be set in the function "automatic cold restart following
power up" with the aid of DX0 (block identifier KH02xx, parameter KH1001, where xx corresponds
to the block length). OB 20 is called both for a cold restart and automatic cold restart. The type of
start-up which will be executed can be seen by evaluating operating system data RS 5 (for more
detailed information, refer to the S5-135U manual).
The command "STP" (STOP) must be programmed in OB 21 and OB 22.
If neither "PA" or "KS" are executed following an automatic cold restart, the IP is placed in a queue.
Interrupting the user program by event and time-driven interrupts with the S5-155U
The user program is interrupted at the block boundaries or at the command boundaries if data block
DX0 has suitable parameters assigned.
If interrupt OBs are programmed in the user program in which the scratchpad flag area (flag byte
FY200 to FY255) is used, make sure that this flag area is saved and reloaded before the interrupt
OBs are exited. (Function blocks FB 38 and FB 39).
Start-up procedure of the S5-150U
Cyclic program execution following cold restart (OB 20) begins at the start of OB 1.
With the warm restarts OB 21 (manual restart) or OB 22 (automatic warm restart), the program
execution is resumed at the point of interruption after the start-up OBs have been run through.
If neither "PA" or "KS" are executed following an automatic cold restart, the IP is placed in a queue.
Power up - first operation
The temperature controller module must first have parameters assigned using the command KS
(cold restart).
The function block checks the version of the temperature controller module. The firmware release
(message 16, byte 14) must be greater than 20. With older releases, the function block FB 162
indicates a parameter assignment error (error number 1).
IP244
C79000–B8576–C861–02
Application of the Function Block
5–57