32
Up
to ten Special I/O Units may be mounted in any slot of
the CPU Rack or Ex
-
pansion I/O Racks. Up to five Slave Racks may be used, whether one or two
Masters are used. IR area words are allocated to Special I/O Units and Slave
Racks by the unit number on the Unit, as shown in the following tables.
Special I/O Units Slave Racks
Unit number IR address Unit number IR address
0
100 to 109
0
050 to 059
11
10 to 1
19 1
060 to 069
2
120 to 129
2
070 to 079
3
130 to 139
3
080 to 089
4
140 to 149
4
090 to 099
5
150 to 159
6
160 to 169
7
170 to 179
8
180 to 189
9
190 to 199
The C500-RT001/002-(P)V1 Remote I/O Slave Rack may be used, but it re-
quires
20 I/O words, not 10, and therefore occupies the I/O words allocated to 2
C200H
Slave Racks, both the words allocated to the unit number set on the rack
and the words allocated to the following unit number. When using a C200HS
CPU,
do not set the unit number
on a C500 Slave Rack to 4, because there is no
unit
number 5. I/O words are allocated only to installed Units, from left to right,
and not to slots as in the C200HS system.
I/O
words between IR 200 and IR 231 are
allocated to Optical I/O Units and I/O
Terminals by unit number. The I/O word allocated to each Unit is IR 200+n,
where n is the unit number set on the Unit.
Remote
Master I/O Units and Host Link Units do not use I/O words, and the PC
Link Units
use
the LR area, so words allocated to the slots in which these Units
are mounted are available as work words.
Bit Allocation for I/O Units An I/O Unit may require anywhere from 8 to 16 bits, depending on the model.
With
most I/O Units, any bits not used for input or output are available as
work
bits.
T
ransistor Output Units
C200H-OD213 and C200H-OD41
1, as well as T
riac
Output
Unit
C200H-OA221, however
, uses bit 08 for the Blown Fuse Flag. T
ran-
sistor Output Unit C200H-OD214 uses bits 08 to 1
1 for the Alarm Flag. Bits 08 to
15
of any word allocated to these Units, therefore, cannot be used as work bits.
The
Interrupt Input Unit uses the 8 bits of the first I/O word allocated to its slot in
the CPU Rack. (An Interrupt Input Unit will operate as a normal Input Unit when
installed
in an Expansion I/O Rack.) The other 24 bits allocated to its slot in the
CPU Rack can be used as work bits.
Allocation for Special I/O
Units and Slave Racks
Allocation for Optical I/O
Units and I/O Terminals
Allocation for Remote I/O
Master and Link Units
Bit Allocation for Interrupt
Input Units
IR Area Section 3-3
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