Introduction.

Workshop PG5
Resources
Timer Example:
You have a high signal on Input 4. On the rising edge of this signal you want
to send a high signal out, output 65. This signal will have a duration of 2,5
seconds.
Integer value:
Load the timer:
LD T 1
25
Value displayed by the
output "t" of the
XPluse FBox
Binary value:
Value displayed by the output Q
Instruction list program: FUPLA program:
Solution:
COB 0 ;organization block 0
0 ; time out time
STH I 4 ;If input 4
DYN F 12 ;sees a rising edge
LD T 1 ; load the timer1
25 ; with 2,5 seconds
STH T 1 ;copy timer state
OUT 0 65 ;to the output O65
ECOB
(FBox: Time related, Exlusive Pulse)
Technical stuff:
Time constants
Timers in the SAIA PCD are decremented at a rate defined by the “Software
settings” “Timer” “Timebase”(normally 100ms). The actual time defined by a
constant which is loaded into a Timer changes if the “Timebase” is changed.
This means that if the “Timebase” setting is changed, then all Timer load values
must also be changed. To overcome this problem, the “time” data type can
be used to declare Timer load values. If a time value is used, then the linker
calculates the actual Timer load value according to the “Timebase” settings.
Format:
T#nnnS|MS
Examples: DelayTime EQU T#100MS ;100 milliseconds
OneDay EQU t#86400s ;86400 seconds
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