level 1
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
SR 238 SR 242 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1
SR 239 SR 243 16 15 14 13 12 11 10 9 16 15 14 13 12 11 10 9
SR 240 SR 244 24 23 22 21 20 19 18 17 24 23 22 21 20 19 18 17
SR 241 SR 245 32 31 30 29 28 27 26 25 32 31 30 29 28 27 26 25
1: PC CPU error 1: PC RUN status
3-4-2 Remote I/O Systems
SR 25312 turns ON to indicate an error has occurred in Remote I/O Systems.
The ALM/ERR indicator will flash, but PC operation will continue. SR 251, as
well as AR 0014 and AR 0015, contain information on the source and type of
error.
The function of each bit is described below
. Refer to
Optical
and
W
ired Re
-
mote I/O System Manuals for details.
Bit 00 – Error Check Bit If
there are errors in more than one Remote I/O Unit, word 251 will contain
error
information for only the first one. Data for the remaining Units will be stored in
memory and can be accessed by turning the Error Check bit ON and OFF
. Be
sure
to record data for the first error
, which will
be cleared when data for the next
error is displayed.
Bits 01 and 02 Not used.
Bit 03 Remote
I/O Error Flag: Bit 03 turns ON when an error has occurred in a Remote
I/O Unit.
Bits 04 to 15 The
content of bits 04 to 06 is a 3-digit binary number (04: 2
0
, 05: 2
1
, 06: 2
2
) and
the
content of bits 08 to 15 is a 2-digit BCD number (08 to 1
1: 10
0
, 12 to 15: 10
1
).
If
the content of bits 12 through 15 is B, an error has occurred in a Remote I/O
Master
or Slave Unit, and the content of bits 08 through 1
1 will
indicate the unit
number,
either 0 or 1, of the Master involved. In this case, bits 04 to 06 contain
the unit number of the Slave Rack involved.
If the content of bits 12 through 15 is a number from 0 to 31, an error has oc-
curred
in an Optical I/O Unit or I/O T
erminal. The number is the unit number of the
Optical
I/O Unit or I/O T
erminal involved, and bit 04 will be ON if the Unit is as
-
signed leftmost word bits (08 through 15), and OFF if it is assigned rightmost
word bits (00 through 07).
3-4-3 Link System Flags and Control Bits
Use
of the following SR bits depends on the configuration of any Link Systems to
which
your PC belongs. These flags and control bits
are used when Link Units,
such
as PC Link Units,
Remote I/O Units, or Host Link Units, are mounted to the
PC Racks or to the CPU. For additional information, consult the System Manual
for the particular Units involved.
The
following bits can be employed as work bits when the PC does not belong to
the Link System associated with them.
SR Area Section 3-4
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