Delta DVP-PLC User Manual

4 Step Ladder Instructions
DVP-PLC Application Manual
4-1
4.1 Step Ladder Instructions [STL], [RET]
Mnemonic Function Program steps
STL
Step Transition Ladder Start 1
Controllers
ES EX SS SA SX SC EH SV
Operand
S0 ~ S1023
Explanations:
STL Sn constructs a step. When STL instruction appears in the program, the program will enter a step ladder diagram
status controlled by steps. The initial status has to start from S0 ~ S9. RET instruction indicates the end of a step
ladder diagram starting from S0 ~ S9 and the bus returns to a normal ladder diagram instruction. SFC uses the step
ladder diagram composed of STL/RET to complete the action of a circuit. The No. of S cannot be repeated.
Mnemonic Function Program steps
RET
Step Transition Ladder Return 1
Controllers
ES EX SS SA SX SC EH SV
Operand
N/A
Explanations:
RET indicates the end of a step. There has to be a RET instruction in the end of a series of steps. One PLC program
can be written in maximum 10 steps (S0 ~ S9) and every step should end with a RET.
Program Example:
Ladder diagram: SFC:
M1002
ZRST S0 S127
SET S0
SET S20
Y0
SET S30
Y1
SET S40
Y2
S0
RET
END
X0S0
S
S20
S
X1
S30
S
X2
S40
S
X3
S0
S20
S30
S40
S0
M1002
X0
X1
X2
X3
Y0
Y1
Y2

Delta DVP-PLC Specifications

General

Manufacturer	Delta Electronics
Model	DVP-PLC
Category	Controller
Humidity	5% to 95% RH, non-condensing
Programming Language	Ladder Diagram (LD), Instruction List (IL), Sequential Function Chart (SFC)
CPU Type	Various, depending on the specific model within the DVP series (e.g., ES2, EX2, SX2, SA2, EH3, etc.)
Operating Temperature	Typically 0°C to 55°C (32°F to 131°F)
Storage Temperature	Typically -25°C to 70°C (-13°F to 158°F)