Delta AH500 - Explanation of Jump Instructions

Chapter 6 Applied Instructions
6-135
6.5.2 Explanation of Jump Instructions
API Instruction code Operand
Function
0400 CJ P
S
Conditional jump
Device
X Y M S T C HC D L SM SR E PR K 16# “$” DF
S
Pulse instruction 16-bit instruction (3 steps) 32-bit instruction
AH500
AH500
－
Symbol:
S
：
Jump destination
Explanation:
1. When some part of the program in the PLC does not need to be executed, users can use CJ or
CJP to shorten the scan time. Besides, when a dual output is used, users also can use CJ or
CJP.
2. If the program specified by the label is prior to the instruction CJ, the watchdog timer error will
occur, and the PLC will stop running. Please use the instruction carefully.
3. The instruction CJ can specify the same label repeatedly.
4. When the instruction is executed, the actions of the devices are as follows.
 The state of Y, the state of M, and the state of S remain the same as those before the
execution of the jump.
 The timer stops counting.
 The general applied instructions are not executed.
Example 1:
1. When X0.0 is ON, the execution of the program jumps from address 0 to address N
(LABEL1:).
2. When X0.0 is OFF, the execution of the program starts from address 0, and the instruction CJ
is not executed.