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PC Status Area
The following table shows the specific functions of flags and control bits in the
PC Status Area, G000.
G000
bit(s)
Function
00
ON when the PC is in PROGRAM mode.
01
ON when the PC is in DEBUG mode.
02
ON when the PC is in MONITOR mode.
03
ON when the PC is in RUN mode.
04
ON when the program is being executed (RUN or MONITOR mode).
05
Not used.
06
ON when a non-fatal error has occured. (PC operation continues.)
07
ON when a fatal error has occured. (PC stops.)
08
SPL/DPL Mode Flag
OFF when operating in duplex mode
ON when operating in simplex mode
09
Active CPU Unit Flag
OFF when the CPU Unit on the left is active.
ON when the CPU Unit on the right is active.
10
Not used.
11
UM Protect Bit. Prevents both reading out and writing to Program
Memory when turned ON. Set with the SSS.
12
Memory Card Protect Bit. Prevents writing to Memory Cards when
turned ON. Set with the Memory Card Protect Switch.
13 and 14
Not used.
15
UM Protect Bit. Prevents writing to Program Memory when turned ON.
Set with the System Protect Key Switch.
Calendar/Clock Area
The following table shows the function of bits in the Calendar/Clock Area, G001
to G004. The clock is set with the SSS. Refer to the SSS Operation Manuals for
more details.
Word
Bits
Contents
Possible values
G001
00 to 07
Seconds
00 to 59
08 to 15
Minutes
00 to 59
G002
00 to 07
Hours
00 to 23 (24-hour system)
08 to 15
Day of month
01 to 31 (adjusted by month and for leap year)
G003
00 to 07
Month
1 to 12
08 to 15
Year
00 to 99 (Rightmost two digits of year)
G004
00 to 07
Day of week
00 to 06 (00: Sun.; 01: Mon.; 02: Tues.;
03: Wed.; 04: Thurs.; 05: Fri.; 06: Sat.)
Note The accuracy of the internal clock depends on the ambient temperature. Refer
to the following table.
Ambient temperature
Error per month
55
_
C
–3 to 0 min
25
_
C
±
1 min
0
_
C
–2 to 0 min
Data Link Area
The CPU Bus Link Area is disabled by default in the PC Setup and must be en-
abled with the SSS in order to use the Data Link Area.
CPU Bus Link Area
Section 3-5
Summary of Contents for CVM1D
Page 462: ...SYSMAC CVM1D Duplex System Programmable Controllers Operation Manual Revised August 2001...
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