Siemens SIMATIC S5-90U System Manual page 340

Integral Real-Time Clock
Prompt Time Sequence
• Bit 13 in the status word is set after the prompt time has elapsed.
• Bit 13 remains set until you reset it in the control program.
• The prompt time can be read at any time.
Caution
!
If the prompt time is reached in the STOP mode or during Power OFF, the prompt time
cannot be evaluated. It is always deleted on restart.
Example: Setting and evaluating the prompt time
In the example program, the status of input I 32.6 determines whether the settings for the prompt
time are transferred. Before setting input I 32.6, you must transfer the settings to flag bytes FY130
and FY135. Enter values that you do not wish to be evaluated as FF
You set the clock mode with input I 33.0. Use input I 32.1 to specify the the AM/PM bit for 12-hour
mode.
If the preset prompt time has been reached, set flag F 13.2. Any errors made while entering the
prompt time are displayed in flag F 12.2.
The clock data is stored in DB2 beginning with data word DW0, and the status word is flag word
FW10.
OB1 STL
:
:
:
:
:
:A I 32.6
:S F 20.1
:JU FB 11
NAME :WECKZ-ST
WDAY : FY 130
DAY : FY 131
MON : FY 132
HOUR : FY 133
AMPM : I 32.1
MIN : FY 134
SEC : FY 135
ERR : F 12.2
ALRM : F 13.2
MODE : I 33.0
:BE
13-18
.
H
Explanation
=========================================
SETTING AND EVALUATING THE PROMPT TIME
=========================================
LOAD VALUES INTO FY130 TO FY135
FIRST.
TRIGGER SETTING OF PROMPT TIME
BY SETTING F 20.1 (RESET IN FB11)
(SET AND EVALUATING PROMPT TIME)
WEEKDAY
DAY
MONTH
HOUR
AMPM-BIT (ONLY IMPORTANT IN 12-HOUR MODE)
MINUTES
SECONDS
ERROR BIT
DISPLAYS THAT PROMPT TIME IS REACHED.
12-HOUR MODE: I 33.0 = 1
S5-90U/S5-95U
EWA 4NEB 812 6115-02b