Rtt_ - Real Time Clock Trip - Siemens 353 User Manual

Function Blocks

3.2.79 RTT_ - Real Time clock Trip

RTT_ function blocks provide high (1) outputs when time
from the CLOCK block coincides with the TIME, DATE, &
DAYS of the Week TRIP settings. The block outputs will
remain high while the CLOCK coincides with the settings.
Output TM will go high when the TIME coincides with the
TIME TRP setting. It will remain high for 1 second.
Output DT will go high when the MONTH, DAY, & YEAR
coincides with the MNTH TRP, DAY TRP, & YEAR TRP. It
will remain high for one day.
Output DY will go high when the Day of the Week, calculated
by the 353, corresponds to the MONTH, DAY, & YEAR.
The Clock Status output will go high if there is a problem with
the clock or the clock has been reset. The Battery Status will
go high if the battery is low. The battery low condition could
also cause a clock reset when the power is cycled. These
outputs can be used to trip a User Status alarm condition or in logic to force a loop to manual, standby, hold, etc.
Status outputs could be intermittent and may require configuration of function block logic to latch the status and
operator interaction using pushbutton switches to clear.
3-84
REAL TIME TRIP
RTT_
TiMe Trip
1 7 : 3 6 : 1 6
TIME
DaTe Trip
MNTH 1 2
DAY
3 0
YEAR
1 9 9 9
DaYs Trip
DAYS 0 1 1 1 1 1 0
S M T W T F S
T I M E T R P
TIME TRiP (S) ...... 00:00:00 - 23:59:59
D A Y S T R P
DAYS TRiP ..................... SMTWTFS
(S)
M N T H T R P
MNTH TRiP ........................... 01 - 12
(S)
D A Y T R P
DAY TRiP (S) .............................. 01 - 31
Y E A R T R P
YEAR TRiP .................... 1970 -3099
(S)
UM353-1B
TM
TiMe Trip
DT
DaTe Trip
DY
DaYs Trip
CS
Clock Status
BS
Battery Status
(0)
(1111111)
(01)
(01)
(1999)
Rev. 3
April 2012