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18-4

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

C79000-G7076-C504-02

18.3 Jump in the Block If RLO = 1 (Conditional Jump)

The Conditional Jump instruction corresponds to a “go to label” instruction if

RLO = 1. Use the Ladder element “Jump unconditional” for this operation

but only with an advance logic operation. The conditional jump is only

executed when the result of this logic operation is RLO = 1. None of the

instructions between the jump operation and the label is executed.

You can use this instruction in all logic blocks: organization blocks (OBs),

function blocks (FBs), and functions (FCs).

Table 18-2 Conditional Jump Element and Parameters

LAD Element Parameter Data Type Memory Area Description

JMP

Name of a

label

– – The address determines the mark to

which the jump is made when the

RLO = 1.

JMP

Network 1

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write – – – – – 0 1 1 0

I 0.0

Q 4.0

I 0.3

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

jump to label CAS1 is executed. The

instruction to reset output Q 4.0 is not

executed, even if the signal state of input

I 0.3 is 1.

CAS1

Q 4.1

I 0.4

Network 3

CAS1

Network 2

Figure 18-3 Conditional Jump: Go to Label

Description

Jum

Instructions

1 2 ... 217 218 219 220 221 222 223 224 225 226 227 ... 317 318

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