3 drop numbers – Rockwell Automation 57C329 Remote I/O Communications, AutoMax User Manual
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2.3
Drop Numbers
Drop numbers are used to uniquely identify every rack on the
Remote I/O network; therefore, a drop and a rack are the same entity
on a Remote I/O network. There are a maximum of seven slave drops
on a Remote I/O network, each identified by the rotary switch (Shark)
or thumbwheel switches (Remote I/O module, Remote Drive Interface
Head, and Remote I/O Heads) on the faceplate. For Remote I/O
modules drop numbers 0 through 7 are valid, with drop 0 always
being reserved for the master Remote I/O module. For all Remote
Heads, only drop numbers 1 through 7 are valid.
For Shark racks, which can only be slave drops, the drop number
setting should be selected based upon the I/O module complement
in the rack. A rack containing digital modules only should be set to
drop numbers 9 through F. This allows faster network throughput.
Note that drop numbers 1 through 7 will also work for racks
containing only digital modules; however, the total network
throughput will be slower with this setting. See section 4.5 for
information on network throughput.
A Shark rack containing mixed digital and analog (numeric) or all
analog modules must be set to drop numbers 1 through 7. No other
drop numbers are valid. In addition, you must also write a
configuration word in the AutoMax application program as described
in section 4.6.1. See figure 2.5 for valid drop number settings.
Multibus
Remote Head
Shark Drop
Shark Drop
Drop
Drop
(all digital)
(mixed digital
Drop #
and analog or
all analog)
0
OK (master)
X
X
X
1
OK
OK
OK*
OK
2
OK
OK
OK*
OK
3
OK
OK
OK*
OK
4
OK
OK
OK*
OK
5
OK
OK
OK*
OK
6
OK
OK
OK*
OK
7
OK
OK
OK*
OK
9
N/A
N/A
OK
X
A
N/A
N/A
OK
X
B
N/A
N/A
OK
X
C
N/A
N/A
OK
X
D
N/A
N/A
OK
X
E
N/A
N/A
OK
X
F
N/A
N/A
OK
X
OK = valid setting
OK* = valid setting, but will result in lower throughput
X = not a valid setting
N/A = not applicable, i.e., the setting is unavailable
Note: If you are using settings 9 through F on any drop on the remote I/O
network, see figure 2.6 for more information
Figure 2.5 Ć Remote I/O Network Drop Numbers