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Installing and Preparing the C7
2.10 C7 Clocks
Overview
Clock in the
2
C7 CPU
Setting the C7 CPU
Clock
Master Clock
Setting and
Reading the Clock
in the Control
Section
Clock During
Power Off
Clock in the C7 OP
Section
Setting the O/I
Clock
Setting and
Reading the Clock
in the C7 OP
Section
2-22
A C7 system has two clocks:
One clock in the C7 CPU
One clock in the C7 OP
The clock in the C7 CPU is an integral "real-time clock" (hardware clock).
This clock is independent of the clock in the C7 OP.
The clock is supplied with the following value set:
DT#1994-01-01-00:00:00.
As an integrated clock, the C7 CPU clock can also function as the master
clock within the C7 I/O configuration (see also Section 3.4.6 in Volume 2).
You can set and read the clock in the following ways:
With the programming device (PG) using STEP 7
or
In the user program with SFC0 "SET_CLK". With SFC1 "READ_CLK",
you can read the current time of day (see the reference manual /235/).
The C7 must always be backed up with a battery. The clocks in the C7
continue to run during power off.
The clock in the C7 OP is independent of the clock in the C7 CPU.
The clock is supplied with the following value set:
01.01.94 -00:00.
The clock time can be set:
Via the user program and interface block, or
On-line by operator input if the special display "Clock Time/Date" has
been configured and selected (see Volume 2, Section 6.7.1).
C7-626 / C7-626 DP Control Systems
C79000-G7076-C626-01
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