Inovance H3U Series - Step Sequential Control

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4
4 Instructions4.2.5 Step Sequential Control
Example 2:
ĂĂ
Loop 2
ǒNEXTǓ
ǒFOR K4Ǔ
ǒFOR K3Ǔ
ǒNEXTǓ
Loop 1
ǒCJ P2Ǔ
X0
X2
ǒY2Ǔ
ǒENDǓ
P2
Use the CJ instruction to skip FOR–NEXT
instructions. When X0 = OFF, loops 1 and 2
are executed. When X0 = ON, the CJ
instruction jumps to P2. The program
between loops 1 and 2 is not executed.
Example 3:
Use the CJ instruction to skip FOR–NEXT
instructions. When X0 = OFF, loop 2 inside
loop 1 is executed. When X0 = ON, the CJ
instruction jumps to P2. FOR–NEXT
instructions of loop 2 nested in loop 1 are
not executed.
ĂĂ
Loop 2
ǒNEXTǓ
ǒFOR K4Ǔ
ǒFOR K3Ǔ
ǒNEXTǓ
Loop 1
ǒCJ P2Ǔ
X0
X2
ǒY2Ǔ
ĂĂ
P2
ǒENDǓ
4.2.5 Step Sequential Control
◆
Overview
SLT Program jump to the secondary bus
Applicable model: H3U
Operand type: S
Number of steps: 1 step
RET Program return to the primary bus
◆
Function
STL instructions (STL and RET)
STL divides the running process of a controlled device into several states or procedures, performs
logical programming on each state, and then executes state switch based on the signal condition. STL
programming simplies logical design and makes commissioning and maintenance easier.
STL instructions can be represented by a ladder chart, where the state (S) is considered as a control
procedure used for the sequential programming of input conditions and output control. This type of
control separates the ongoing procedure from the preceding procedure and implements device control by
executing various procedures in sequence.
STL and ladder charts differ in programming.
• An STL program starts with the STL instruction (which is different from S used in ladder charts) and ends with
the RET instruction. The intermediate programs are guided by the S state. The operation logic of the S state is
switched to the next state when conditions are met.