编写FB1如下:
FUNCTION_BLOCK FB1
TITLE=
VERSION:0.1
VAR_INPUT
VALVE:BOOL
AS :BOOL
TIME_SCAN:INT
END_VAR
VAR_OUTPUT
ALARM:BOOL
END_VAR
VAR
TIME_INT:INT
END_VAR
BEGIN
NETWORK
TITLE=
A #VALVE;
AN #AS;
JC M001;
CLR;
= #ALARM;
L 0;
T #TIME_INT;
JU END;
M001: L #TIME_INT;
L 4000;
>=I
JC M002;
L #TIME_SCAN;
L #TIME_INT;
+I;
T #TIME_INT;
JU END;
M002:SET;
= #ALARM;
END: NOP 0;
END_FUNCTION_BLOCK

然后在ＯＢ１中编程：
　CALL FB1, DB1
VALVE:=对应电磁阀1的输出地址,例如Q0.0
AS :=对应电磁阀1的接近开关的输入地址,例如I0.0
TIME_SCAN:= #OB1_PREV_CYCLE
ALARM:= 对应电磁阀的报警信号输出地址例如Q2.0
.
.
.
CALL FB1,DB14
VALVE:=对应电磁阀14的输出地址,例如Q1.5
AS :=对应电磁阀14的接近开关的输入地址,例如I1.5
TIME_SCAN:= #OB1_PREV_CYCLE
ALARM:= 对应电磁阀的报警信号输出地址例如Q3.5