Lenze PM94P01C - Manual (Page 89)

PM94P01C 87
Reference
Table 31: EVENT
EVENT Starts Event handler Statement
Purpose EVENT keyword is used to create scanned events within the user program.
Statement also sets one of 4 possible types of events.
Syntax Any one of the 4 syntax examples herein may be used:
1.
EVENT <name> INPUT <inputname> RISE
2. EVENT <name> INPUT <inputname> FALL
3. EVENT <name> TIME <period>
4. EVENT <name> <expression>
name any valid alphanumeric string
inputname any valid input “IN_A1 - IN_C4”
period any integer number. Expressed in ms
expression any arithmetic or logical expression
The following statements can not be used within event’s handler:
MOVE,MOVED,MOVEP,MOVEDR,MOVEPR,MDV
MOTION SUSPEND
MOTION RESUME
STOP MOTION
DO UNTIL
GOTO
GOSUB
HALT
VELOCITY ON/OFF
WAIT
WHILE
While GOTO or GOSUB are restricted, a special JUMP statement can be used for program flow change from
within event handler. See JUMP statement description in Language Reference section.
Remarks
For syntax 1 and 2:
The Event will occur when the input with the <name/number> transition from L(Low) to H (High), for syntax 1 (RISE) and
from H (High) to L(Low) for syntax 2 (FALL).
For syntax 3:
The Event will occur when the specified , <period>, period of time has expired. This event can be used as periodic event to
check for some conditions.
For syntax 4
The Event will occur when the expression, <expression>, evaluates to be true. The expression can be any valid arithmetic
or logical expression or combination of the two. This event can be used when implementing soft limit switches or when
changing the program flow based on some conditions. Any variable, (user and system), or constants can be used in the
expression. The event will only trigger when the logic transitions from False to True. Further occurrence of the event will not
occur while the condition remains true.
See Also ENDEVENT, EVENT ON, EVENT OFF
Example:
EVENT InEvent IN_A1 RISE
V0 = V0+1 ; V0 increments by 1 each time IN_A1 transitions from low to high
ENDEVENT
EVENT period TIME 1000
;1000 ms = 1Sec
V3=V0-V1 ;Event subtracts V1 from V0 and stores result in V3 every second (1000mS)
ENDEVENT
;------------------------------------------------------------------------------
EVENT InEvent ON
EVENT period ON
{program statements}
END