AEG SB4 series User Manual Page 145

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21
Programming in Dolog B
133
From switch ”ON
(make contact)
Interlocking condition
From switch ”OFF”
(break contact)
OFF command (program)
UND
E 2E2
E 2E4
A 101
ODER
EN 2E6
E 201
A 102
SPG
ES 101
ER 102
A 5A2
UND
SPG
ODER .09
.07
.08
5A2
2E2
2E4
2E6
201
E
E
E
E
A
A
ES
ER
A
101
102
Figure 66 Part of a Program (Switching On and Off, Storing), Function Diagram (Left), VList (Right)
A.1.2 Structure of a VList With Jumps
A VList does not have to be constructed in linear form. With the aid of jump blocks it is
possible to run individual parts of a VList dependent on the process state (signal from
the periphery).
A part of the VList is skipped depending on a condition
A part of the VList is run depending on a condition
A.1.2.1 A Part of the VList is Skipped Depending on a Condition
When the block SPB (jump near, conditioned) is reached, the enable condition (EF) is
fulfilled, a part of the VList is skipped. At the point for the jump target the block SZ
(jump destination near) is set which is allocated to the SPB.
Block
END
Start
1
yes
n
EF=1 ?
no
SPB
Block
.
.
.
.
.
.
SZ
.
.
.
Figure 67 VList with a Conditioned Jump Block
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