General - Siemens SIMATIC S5 IP 281 Equipment Manual

7.1

General

Use As an introduction working with the 1P 281, this section contains a program-
ming example which can be run on PLC S5–1 15U/S5– 115H.
(OB 20 and DX O must be added to the program when PLC S5–135U or
S5–155U/S5–l 55H is used.)
You can use this program as the basis for your own program. The individual
blocks must then be adapted or supplemented to suit the application.
Block
allocation
OB 1
Function
Block
Cyclic program processing
Interrupt-controlled program proc8asing for IRA
OB 2
Startup bahaviorfor manual power-on (STOP –> RUN)
OB 21
OB 22 Startup behavior for return of voltage
FB 10 Interfaces for inputa/outputs
FB 20 Startup FB for 1P 281
FB 21 Cyclic main program
Interrupt program
FB 22
Working DB for IP 281
DB 20
Programming Example
7 – 1