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Unit Numbers and I/O Word Allocation
3-2-2
C200H Masters
I/O Unit Word Allocations
Remote Terminal Words
Terminators
Master Unit Numbers
Master Designations on
C200H Slaves
34
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I/O Units on C200H Slave Racks are allocated words according to the unit
number set on the Slave and the word assigned to the slot to which the I/O
Unit is mounted. For example, if the Slave is Unit #0, words 50 through 59
are allocated to the Slave Rack. I/O slots on the Rack would be, from left to
right, 50, 51, 52 ... 58, and 59. Slot words do not change even if an I/O Unit is
not mounted in every slot. Slot words not used on shorter Racks can be use
as work words. The following table shows the words allocated for each Slave
unit number. Note that the Slave will not operate if the same unit number is
set for more than one Slave or if a number not between 0 and 4 (inclusive) is
assigned. If an Expansion I/O Rack is connected to a C200H Slave Rack via
I/O Connecting Cable, the Expansion I/O Rack will be automatically assigned
the words for the next unit number. Such unit numbers cannot be set on any
other Slave.
Unit number
Words
0
50 through 59
1
60 through 69
2
70 through 79
3
80 through 89
4
90 through 99
Remote Terminals connected to C200H Masters are allocated words 200
through 231. The actual word numbers will be 200 greater than the numbers
set on the Remote Terminals.
The last Slave, Remote Terminal in each Master Subsystem must be set as
the terminator no matter how large the Subsystem is. Without a terminator
set for each Master Subsystem, the I/O System and the PC will not operate,
and the END RS indicator on the PC will remain lit. If a Programming Con-
sole is mounted, the display will show that the CPU Unit is on standby.
C200H Masters must also be assigned unit numbers. These numbers deter-
mine response to error processing and AR area Error flags and Restart bits.
See 4-1 Remote I/O Units for unit number switch settings and 7-2 Error
Codes and Monitoring for details on error flags and restart bits.
C200H Masters must also be assigned Unit numbers. These numbers deter-
mine response to error processing and AR area error flags and restart bits.
See 4-1 Masters and Slaves for unit number switch settings and 7-2 Error
Codes and Monitoring for details on Error flags and Restart bits.
The Master to which a C200H Slave is connected must be designated on the
"type of Master" switch on each C200H Slave. See Section 4 for details on
switch settings.
Section 3-2
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