5 types of sequences, 4 step ladder instructions, Single sequence – Delta Electronics Programmable Logic Controller DVP-PLC User Manual
Page 179
4 Step Ladder Instructions
DVP-PLC Application Manual
4-9
Device No.
Function
M1046
Setting STL status as On. On when any of the steps is On.
M1047
Enabling STL monitoring
D1040
On status of step No. 1
D1041
On status of step No. 2
D1042
On status of step No. 3
D1043
On status of step No. 4
D1044
On status of step No. 5
D1045
On status of step No. 6
D1046
On status of step No. 7
D1047
On status of step No. 8
4.5 Types of Sequences
Single Sequence:
The basic type of sequences
The first step in a step ladder diagram is called the initial step, which can be S0 ~ S9. The steps following the
initial step are general steps, which can be S10 ~ S1023. If you are using IST instruction, S10 ~ S19 will become the
steps for zero return.
a) Single sequence without divergence and convergence
After a sequence is completed, the control power on the steps will be given to the initial step.
Step ladder diagram
M1002
ZRST
S0
S127
SET
S0
SET
S20
Y0
SET
S30
Y1
SET
S40
Y4
S0
RET
END
X0
S0
S
S20
S
X1
S30
S
X2
S60
S
X5
Y2
SET
S50
S40
S
X3
Y3
SET
S60
S50
S
X4
SFC:
S0
S20
S30
S40
S0
M1002
X0
X1
X2
X5
Y0
Y1
Y2
S50
X3
Y3
S60
X4
Y4