Siemens Moore 353, Руководство пользователя

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UM353-1 Function Blocks
March 2003 3-75
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
ulse Input
ONE SHOT TIMER
O1
O utput 1
ONE SHOT TIMER
OST_ ESN = 000
P
E S N
E xec. S eq. N o.
(H)
................. 001 to 250
P T U P N I
INPUT P
(H)
...........
loop tag.block tag.output ( null )
M E I O N T
ON TIME (minutes)
(S)
.................... Real (0.0)
P
ower
U
p
LAST
(S)
................... NO/YES (YES)
P U L A S T
ET
E
lapsed
T
ime
RETRIG
ger on new pulse
(S)
.... NO/YES (YES)
G I R T E R
RT
R emaining T ime
BLOCK DIAGRAM
O1
P
O1
P
RETRIG = YES
.
.
ET
0
1
0.0
0
1
ON TIME
ET
RT
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