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6.11 Clock Function

FUNCTIONS

6.11 Clock Function

(1) Definition of Clock Function

The clock function reads the internal clock data of the CPU module to use it for time

management.

The clock data is used by the CPU module system to perform time management, e.g.

storage of date into the operation/error history.

(2) Clock operation at power OFF and momentary power failure

Clock operation is continued by the internal battery of the CPU module during power

OFF of the PLC or when a power failure longer than the permissible momentary

power failure time occurs.

(3) Clock Data

Clock data is used in the CPU module and includes the data indicated in Table6.16.

Table6.16 Clock data details

Data Name Contents

Year Four digits in AD (Countable from 1980 to 2079)

Month 1 to 12

Day 1 to 31 (Automatic leap year calculation)

Hour 0 to 23 (24 hours)

Minute 0 to 59

Second 0 to 59

Day of the week

0 Sunday

1 Monday

2 Tuesday

3 Wednesday

4Thursday

5Friday

6 Saturday

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 233 234

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