Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 214)

6 Application Instructions API 00-49
DVP-PLC Application Manual 6-2
X0
X1
X2
CJ P1
Y1
Y2
0
N P1
P*** ( ) CJ instruction
Program Example 2:
1. CJ instruction can be used in the following 5 conditions between MC and MCR instructions.
a) Without MC ~ MCR.
b) From without MC to within MC. Valid in the loop P1 as shown in the figure below.
c) In the same level N, inside of MC~MCR.
d) From within MC to without MCR.
e) Jumping from this MC ~ MCR to another MC ~ MCR 1 .
2. Actions in ES/EX/SS series models V4.7 (and below): When CJ instruction is used between MC and MCR, it
can only be applied without MC ~ MCR or in the same N layer of MC ~ MCR. Jumping from this MC ~ MCR to
another MC ~ MCR will result in errors, i.e. a) and c) as stated above can ensure correct actions; others will
cause errors.
3. When MC instruction is executed, PLC will push the status of the switch contact into the self-defined stack in
PLC. The stack will be controlled by the PLC, and the user cannot change it. When MCR instruction is executed,
PLC will obtain the previous status of the switch contact from the top layer of the stack. Under the conditions as
stated in b), d) and e), the times of pushing-in and obtaining stack may be different. In this case, the maximum
stack available to be pushed in is 8 and the obtaining of stacks cannot resume once the stack becomes empty.
Thus, when using CALL or CJ instructions, the user has to be aware of the pushing-in and obtaining of stacks.
X0
MC N0
X2
X3
X1
M1000
M1000
P1
P0
CJ
CJ
MC N1
N1
N0
P1
P0
Y1
Y0
MCR
MCR
1
This function is only available in ES/EX/SS series models V4.9 (and above) and SA/SX/SC/EH/ EH2 /SV series models.