Siemens SIMATIC S5-90U System Manual page 328

Integral Real-Time Clock
Table 13-3. Significance of the Bits of the Status Word (Continued)
Flags Bit Read/Over-
No. write Bit?
Operat- 5 Read and
ing overwrite
system
flags
6
7
Operat- 8 Read
ing
hours
9 Read and
counter
overwrite
flags
Read and
10
overwrite
11
Prompt- Read
12
ing time
flags
Read
13
Read and
14
overwrite
15
13-6
Signal
State
Words 0 to 3 are saved in words 18 to 21 when a
1
switchover from RUN to STOP or a POWER OFF
occurs.
0 Words 18 to 21 are not used
-
irrelev. Occupied by the operating system of the PLC
-
irrelev. Occupied by the operating system of the PLC
1 Error in setting entry
0 No error in setting entry
1 Enable operating hours counter
0 Disable operating hours counter
1 Transfer settings
0 Do not transfer settings
-
irrelev. Occupied by the operating system of the PLC
1 Error in setting entry
0 No error in setting entry
1 Set prompting time is reached
0 Set prompting time is not reached
1 Transfer settings
0 Do not transfer settings
-
irrelev. Occupied by the operating system of the PLC
S5-90U/S5-95U
Meaning
EWA 4NEB 812 6115-02b