Siemens S5-100U User Manual page 304

Simatic s5 programmable controller

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The Integral Real-Time Clock

Make certain you are aware of the following points when you make inputs into the clock data area.

Entries into the clock data area must be in BCD code.

The clock runs either in the 12-hour mode or the 24-hour mode depending on how you set bit 1

in the status word. See section 12-5 for additional information.

The AM/PM flag (0 = AM, 1 = PM) is significant only for the 12-hour mode of the hardware

clock. The AM/PM flag corresponds to bit 7 in words 2, 6, 10, and 20.

In the 12-hour mode, you have to set the hours and the AM/PM flag for both the clock and

prompt functions.

In the 24-hour mode, if you set an AM/PM flag when you enter the values for the clock and

prompting time, then the program sets the relevant error bit.

The clock settings you enter must be within the range defined in Table 12-4.

Permissible Parameters

In the 24-hour mode:

In the 12-hour mode:

for AM: 1 to12

(12 = 12 o'clock noon)

for PM: 81 to 92

(81 = 1 o'clock PM)

0 to 999999 when

entering the operating

Table 12-4. Range Definitions for Clock Data

Permissible Parameters

0 = Leap year is current

1 = Leap year was last year

2 = Leap year was two

3 = Leap year was three

EWA 4NEB 812 6120-02

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