51
3-5-2 Slave Rack Error Flags
AR bits 0200 to AR 0204 correspond to the unit numbers of Remote I/O Slave
Units #0 to #4. These flags will turn ON if the same number is allocated to more
then one Slave or if a transmission error occurs when starting the System. Refer
to SR 251 for errors that occur after the System has started normally.
3-5-3 Group-2 Error Flags
Bits AR 0205 to AR 0215 correspond to Group-2 High-density I/O Units and B7A
Interface Units 0 to 9 (I/O numbers) and will turn ON when the same number is
set for more than one Unit, when the same word is allocated to more than one
Unit, when I/O number 9 is set for a 64-point Unit, or when the fuse burns out in a
Transistor High-density I/O Unit. AR bit 0215 will turn ON when a Unit is not rec-
ognized as a Group-2 High-density I/O Unit.
Note Bits SR 28000 to SR 28015 also act as Error Flags for Group-2 High-density I/O
Units with unit numbers 0 to F.
3-5-4 Optical I/O Unit and I/O Terminal Error Flags
AR 03 through AR 06 contain the Error Flags for Optical I/O Units and I/O Termi-
nals. An error indicates a duplication of a unit number. Up to 64 Optical I/O Units
and I/O Terminals can be connected to the PC. Units are distinguished by unit
number, 0 through 31, and a letter, L or H. Bits are allocated as shown in the fol-
lowing table.
Bits AR03
allocation
AR04
allocation
AR05
allocation
AR06
allocation
00 0 L 8 L 16 L 24 L
01 0 H 8 H 16 H 24 H
02 1 L 9 L 17 L 25 L
03 1 H 9 H 17 H 25 H
04 2 L 10 L 18 L 26 L
05 2 H 10 H 18 H 26 H
06 3 L 11 L 19 L 27 L
07 3 H 11 H 19 H 27 H
08 4 L 12 L 20 L 28 L
09 4 H 12 H 20 H 28 H
10 5 L 13 L 21 L 29 L
11 5 H 13 H 21 H 29 H
12 6 L 14 L 22 L 30 L
13 6 H 14 H 22 H 30 H
14 7 L 15 L 23 L 31 L
15 7 H 15 H 23 H 31 H
Optical I/O Unit and I/O
Terminal Error Flags
AR (Auxiliary Relay) Area Section 3-5
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