Siemens SIMATIC S5 TD 390 Manual Del Usuario página 98

Creating a PLC Program for the TD 390
DW Entry Explanation
4 Text DB for messages.
to Assign the flag bytes to the 5 text DBs which contain messages.
8 On the left, enter the first number (e.g. 000 means byte 0, 1,2) of
DL: FY No. a block of 3 bytes (byte numbers from 0–253). The sequence of
flag bytes affects the speed of the transmission to the TD. If
the sequence is ascending, the transfer time is the lowest (see
"Example of parametric DB"). The byte block is assigned to the
text DB entered on the right (e.g. 052).
KY = nnn,000 means no assignment.
DR: DB No. The maximum permitted number is 5 text DBs.
9 Text DB with timer and counter values.
Assign the flag bytes to a text DB containing timers and counters
and their initialization values.
DL: FY No. Flag byte and
DR: DB No. DB No. as under DW 4 to 8
KY = nnn,000 means no assignment.
Maximum one text DB.
10 Text DB for messages with modifiable process values.
Assign the flag bytes to a text DB containing messages whose
current process value can be displayed for this message.
Flag byte and
DL: FY No. DB No. as under DW 4 to 8
DR: DB No. KY = nnn,000 means no assignment.
Maximum one text DB
11 Enable functions:
Timers and counters, process values, time, alarm, operating
hours.
Only if these enable bits are set can the value be displayed/modi-
fied in the menu "Modifiable values". Timer, counter and process
values are displayed even if an enable bit is not set. The inputs
DL: 0 to 31 are binary–coded.
4
2
3
2
2
2
1
2
0
2
e.g. Enable for timers, counters and process data:
DR: FY No. 016 + 008 results in the input number 024.
Call flag for time (only on CPU 928B and CPU 948)
Flag byte 0 – 255 (see also page 7–6).
8-6
016 Timers and counters
008 Process data
004 Set time
002 Set alarm
001 Reset operating hours
C79000–K8576–C292–01
TD 390