Omron CVM1D Operation Manual page 47

Auxiliary Area
3-6 Auxiliary Area
! Caution
The 120 words of CPU Bus Link Area from G008 to G127 are used for outputs
from the CPU to BASIC Units. The 128 words from G128 to G255 are used for
outputs from the BASIC Units. These are divided into 16 groups of 8 words each
and allocated to CPU Bus Units according their unit number settings as shown in
the following tables. All words not output by a particular BASIC Unit are read by it
as inputs from the other BASIC Units.
Unit # 0 1
Words G128 G136
to to
G135 G143
Unit # 8 9
Words G192 G200
to to
G199 G207
When the PC Setup have been changed to enable the CPU Bus Link, bit 15 of
the first word allocated to each Unit (e.g., bit G12815 for Unit #0) will be OFF
during data reception.
The Auxiliary Area contains flags and control bits used for monitoring and con-
trolling PC operation, accessing clock pulses, and signalling errors. Auxiliary
Area word addresses range from A000 through A511; bit addresses, from
A00000 through A51115. Addresses A000 through A255 are read/write, but ad-
dresses A256 through A511 are read only.
The Force Set/Reset operations from the SSS behave like the SET(016) and
RSET(017) instructions when applied to words A000 through A255.
Unused Auxiliary Area words and bits cannot be used as work words and bits.
The Auxiliary Area contains two sections. The section between A000 and A255
can be read from or written to from the user program. The section between A256
and A511, however, can be read from to access the data provided there, but it
cannot be written to from the user program.
The following table lists the functions of Auxiliary Area flags and control bits.
Most of these bits are described in more detail following the table. Descriptions
are in order by address, except that some bits/words with related functions are
explained together.
Word(s) Bit(s)
A000 00 to 11
12
13
14
15
A001 00 to 15
A002 to A004 00 to 15
A005 00 to 07
08 to 15
A006 and A007 00 to 15
2 3 4
G144 G152 G160
to to to
G151 G159 G167
10 11 12
G208 G216 G224
to to to
G215 G223 G231
Function
Not used.
IOM Hold Bit
Forced Status Hold Bit
Error Log Reset Bit
Output OFF Bit
CPU Bus Unit Restart Bits
Not used.
SYSMAC BUS Error Check Bits
Not used.
Not used.
Section 3-6
5 6 7
G168 G176 G184
to to to
G175 G183 G191
13 14 15
G232 G240 G248
to to to
G239 G247 G255
41