Ost_ - One Shot Timer - Siemens Moore 353 User Manual

UM353-1

3.2.72 OST_ - One Shot Timer

OST_ function blocks provide a high (1) output for a
predetermined time, set by ON TIME, when input P goes
high (1). If input P goes low (0), the output will remain
high until the time expires. If input P goes high during the
on time, the elapsed timer will be re-triggered if RETRIG
is set to YES.
With firmware1.30 and higher the ON TIME is adjustable
over the full range of the display which is 0.00000 to
999999. In earlier versions, the minimum time setting
was 0.1. If the delay time is set to less than the scan time
of the station the delay time will equal the scan time.
Output ET (elapsed time) will ramp from 0.0 to the value of ON TIME and remain there until P goes low (0).
Output RT (remaining time) equals ON TIME - ET.
POWER UP - During a warm start, when PU LAST is set to YES, the block will initialize at the input/output states
and elapsed time in effect at the instant power down occurred. A cold start will initialize the input/output states and
elapsed time to 0.
.
P
March 2003
ONE SHOT TIMER
ONE SHOT TIMER
P
Pulse Input
O N
T I M E
P U L A S T
R E T R I G
I N P U T P
E S N
O1
ON TIME
ET
P
RETRIG = YES
BLOCK DIAGRAM
Function Blocks
OST_ ESN = 000
ET
Elapsed Time
RT
RemainingTime
O1
Output 1
ON TIME (minutes) .................... Real (0.0)
(S)
Power Up LAST ................... NO/YES (YES)
(S)
RETRIGger on new pulse .... NO/YES (YES)
(S)
INPUT P ........... loop tag.block tag.output (null)
(H)
Exec. Seq. No. ................. 001 to 250
(H)
.
ET
1 RT
O1
0
0.0
1
0
3-75