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4 step ladder instructions – Delta Electronics Programmable Logic Controller DVP-PLC User Manual

Page 174

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4 Step Ladder Instructions

DVP-PLC Application Manual

4-4

When the status contact Sn = On, the circuit will be activated. When Sn = Off, the circuit will be disactivated. The

actions will delay for 1 scan time.

SET

S12

Y11

SET

S14

S10

S

X0

S12

S

X1

Y10

Executing the timing diagram below. After the

status of S10 and S12 are transferred (taking place

simultaneously), and after a delay of 1 scan time,

Y10 will be Off and Y11 will be On. There will not be

overlapping outputs.

STL S10

S10

Y10

S12

Y11

X1

X0

Pro gram

execution

Ren ew I nput/ Out put

Cir cuit no t activate d

Pro gram

execution

Pro gram

execution

3. Repeated Use of Output Coil:

a) You can use output coils of the same No. in different steps.

b) See the diagram in the right. There can be the same

output device (Y0) among different statuses. Y0 will be On

when S10 or S20 is On. Such as right diagram, there is the

same output device Y0 in the different state. No matter

S10 or S20 is On, Y0 will be On.

c) Y0 will be Off when S10 is transferring to S20. After S20 is

On, Y0 will output again. Therefore in this case, Y0 will be

On when S10 or S20 is On.

d) Normally in a ladder diagram, avoid repeated use of an

output coil. The No. of output coil used by a step should

also avoid being used when the step ladder diagram

returns to a general ladder diagram.

SET

Y1

Y0

SET

S20

SET

S30

S10

S

X0

S20

S

X1

Y0