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39
SYSMAC NET
Operating
l
l 0
Operating
l
l 1
Bit (Node numbers below)
p
g
level 0
p
g
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 Wired 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 11: 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 11 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 Terminal. The number is the unit number of the
Optical I/O Unit or I/O Terminal 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