Siemens NAN 67 Series Manual de servicio descargar pdf (Pagina 241)

100

101

20-7

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

20.3 Return

You can use the Return instruction to abandon blocks. You can abandon a

block conditionally. Return saves the RLO to the BR bit of the status word.

If a block is abandoned because of a conditional return, the signal state of the

RLO and the BR bit in the block to which program control returns is 1.

Table 20-3 Return Element

LAD Element

Parameter Data Type Memory Area Description

RET

None – – –

If the signal state of input I 0.0 is 1, the block is

abandoned. The BR bit of the status word then has the

same signal state as input I 0.0 (= 1)

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write x – – – x 0 1 1 0

I 0.0

RET

Conditional Return (Return if RLO = 1)

Figure 20-4 Return

Description

Program Control Instructions

1 2 ... 236 237 238 239 240 241 242 243 244 245 246 ... 317 318

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