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4-7
D Verification Error: Slave I/O Size Differs
A verification error (Slave I/O Size Differs) will occur and it will not be possible to start CompoBus/D
communications if a Master Unit is being used with the scan list enabled and the type of I/O (input or
output) or the number of I/O points registered for a Slave in the scan list does not match the actual I/O
specifications of the Slave that is connected to the Master Unit. This error will occur only when the scan
list is enabled.
To eliminate and clear this error, either create the scan list again or replace the Slave with the kind of
Slave registered in the scan list.
Note The scan list verification is performed in byte units (8 bits). A verification error will therefore not
occur if a 1-point Input Slave is used instead of an 8-point Input Slave.
H Fixed Allocation Example
Node
address
Output
points
Input
points
Output area Input area
Allocation not possible
Allocation not possible
Allocation
not possible
Allocation not possible
Allocation possible
Allocated
Allocated
Allocated
Allocated
Allocated
Allocated
Not used
CIO 1900
CIO 1901
CIO 1902
CIO 1903
CIO 1904
CIO 1905
CIO 1906
CIO 1907
CIO 1908
CIO 1909
CIO 1910
CIO 1911
CIO 1912
8
0
16
16
0
8
48
(see note 3)
0
0
8
16
8
16
0
0
1
2
3
4
5
6
7
8
9
10
11
63 None None
Allocation
not possible
Allocation
not possible
Allocation
not possible
Allocated
Allocated
Allocated
Allocated
Allocated
Allocated
Allocated
Allocation possible
Not used
Allocation not possible
Allocation not possible
CIO 2000
CIO 2001
CIO 2002
CIO 2003
CIO 2004
CIO 2005
CIO 2006
CIO 2007
CIO 2008
CIO 2009
CIO 2010
CIO 2011
CIO 2012
Master Unit (see note 2)
. . .
. . .
. . .
12 NoneNone
3232
. . .
Not used
CIO 1963
Not used
CIO 2063
Allocated
Allocated
Allocated
Allocated
032 . . .
Note 1. The above example is for allocations in a CV-series PC.
Note 2. The Master Unit is not allocated any words, so any available node address can be used as
node address 7.
Note 3. Slaves can be allocated to the words labeled “Allocation possible” as long as the same words
are not allocated to more than one Slave.
H Basic Application Procedure
1. Set the initial settings for the Master Unit:
Unit number (“UNIT No.” or “MACHINE No.” on front panel switch)
Node address (back panel DIP switch)
Baud rate (front panel DIP switch)
Communications continue/stop setting for communications error (front panel switch)
CompoBus/D System Startup Chapter 4