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2 Program Blocks 12.93

2.2 Calling program blocks

Block calls are used to release the blocks for execution (Fig. 2.2). These block calls can be

programmed only in organization, sequence, program or function blocks. Organization blocks

may not be invoked by the user program, with the exception of OB180. A block call is compa-

rable with a "subroutine branch", and may be both conditional and unconditional.

A "BE" statement is used to return to the block that contained the block call. No further logic

operations can be carried out on the RLO in the "new block" following a block call or a "BE".

The RLO (result of the logic operation) is passed to the "new block", and can be evaluated

there.

Unconditional call: JU xx

The program block is executed without regard to the RLO.

Conditional call: JC xx

The program block is executed in dependence on the RLO.

Fig. 2.2 Block calls for enabling execution of a program block

PB 1

A I 1.5

JC PB 6

A I 3.2

JU PB5

O I 5.3

BE BE

BEBE

JC PB10

PB 6

O I 3.0

PB 10PB 5

A I 1.0 A I 2.0

Note:

On the SINUMERIK 880 GA2, SW1, and SINUMERIK 840C, OB 19 is called if a non-existent

program block is called.

2–2

SINUMERIK 840C/880 (PJ)

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Siemens 880 Manuale delle Istruzioni Pagina 15