3-22
3.6 EN and ENO
3.6
EN and ENO
Instructions with EN allow control of instruction execution.
An input variable EN inputs the condition for executing a instruction.
An output variable ENO outputs execution status.
The following table shows the status of ENO and the operation result according to the status of
EN.
Table 3.6-1 Status of ENO and the operation result according to the status of EN
Usage examples of EN and ENO
EN
ENO
Operation result
TRUE (Operation execution)
TRUE (No operation error)
Operation output value
FALSE (Operation error)
Undefined value
FALSE (Operation stop)
FALSE
Undefined value
No
Control description
➀
When the EN input is directly connected from the left base line, the EN input is always TRUE and
the instruction is always executed.
If the ADD_E instruction is used in this manner, the operation result is the same as the ADD
instruction without the EN input.
➁
When Variable_1 is connected to the EN input, the instruction is executed when Variable_1 is
TRUE.
➂
When the result of Boolean operation is connected to the EN input, the instruction is executed
when the result of Boolean operation is TRUE.
➃
When the ENO outputs are connected to the EN inputs, three instructions are executed when
Variable_1 is TRUE.
➄
When the ENO outputs are not connected, the execution status of the instruction is not output.
①
②
③
③
④
④
⑤
⑤
Summary of Contents for MELSEC Q Series
Page 1: ...Structured Programming Manual Mitsubishi Programmable Controller QCPU Common Instructions ...
Page 2: ......
Page 14: ...A 12 MEMO ...
Page 340: ...6 178 MEMO MTR ...
Page 708: ...7 368 MEMO ...
Page 776: ...8 68 MEMO ...
Page 796: ...9 20 MEMO ...
Page 804: ...App 8 MEMO ...
Page 812: ...Index 8 MEMO ...
Page 815: ......