Using The Clock - Omron CQM1H - PROGRAM Programming Manual

The CQM1H PCs can be equipped with a clock by installing a Memory Cassette with a clock. This section
explains how to use the clock.
There is an "R" at the end of the model number of Memory Cassettes with a built-in clock. For example, the
CQM1-ME04R Memory Cassette has a built-in clock. Refer to 3-11 Using Memory Cassettes for a list of avail-
able Memory Cassettes.
Note The clock will stop and the current date and time clock data will be lost if the Memory Cassette is
removed from the CPU Unit.
The accuracy of the clock depends on and ambient temperature, as shown in the following table.
Words Containing the Date and Time
The following illustration shows the configuration of the words (AR 17 through AR 21) that are used with the
clock. These words can be read and used as required. (AR 17 is provided so that the hour and minute can be
accessed quickly.)
Setting the Time
To set the time, use a Programming Device as follows:
Note The time can be set easily using menu operations from a Programming Device such as a Programming
Console. Refer to the CQM1H Operation Manual for the Programming Console procedure.
Setting Everything
Set the time and date with the following procedure:
1,2,3... 1. Turn ON AR 2114 (Clock Stop Bit) to stop the clock and allow AR 18 through AR 21 to be over-
written.
2. Using a Programming Device, set AR 18 through AR 20 (minute/second, date/hour, and year/
month) and AR 2100 through AR 2107 (day of week).
3. Turn ON AR 2115 (Clock Set Bit) when the time set in step 2 is reached. The clock will start
operating from the time that is set, and the Clock Stop Bit and Clock Set BIt will be turned OFF
automatically.
Appendix D

Using the Clock

Ambient temperature
55°C
25°C
0°C
15 8 7
AR 17 Hour Minute
AR 18 Minute Second
AR 19 Date Hour
AR 20 Year Month
AR 21 Day of week
AR 2115 Clock Set Bit
AR 2114 Clock Stop Bit
AR 2113 30-Second Adjustment Bit
Accuracy by month
–3 to 0 min
±1 min
–2 to 0 min
0
2 digits BCD each.
(Only the last 2 digits of the
year are displayed.)
00 to 06: Sunday to Saturday
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