Entering The Clock Time Correction Factor - Siemens SIMATIC S5-100U System Manual

S5-100U

12.7.4 Entering the Clock Time Correction Factor

You can configure a correction value that increases the exactness of the integral real-time clock.
The correction value is displayed in seconds/month. The month is defined as 30 days.
Absolute Address
RAM Memory
EA 18
Example: You determined that the clock runs 12 seconds slow in a four day period. That would
be 90 seconds in 30 days. The correction value is+ 90 seconds/month.
Note
Use the data KF format to enter the correction value. You then do not have to convert
the value to other numbering systems.
STL
FB10
L KF + 90
T RS 12
BE
Note
The correction value you have entered is read in after the next minute change. If an
error occurs when a setting is entered, bit 15 in system data word 11 is set.
EWA 4NEB 812 6120-02b
Range
seconds/month
- 400 D to + 400 D
LOAD THE + 90 SECONDS CORRECTION VALUE INTO ACCU 1 AND STORE IT
IN SYSTEM DATA WORD 12.
The Integral Real-Time Clock
System Data Word
Explanation
12
12-35