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Exchanging Data with the CPU Unit
Example for Mode 0
I/O Memory (Allocated in the Special I/O Unit Area in the CIO Area)
Output/
Bit
input
Address
CIO 2000
CIO 2001
Output
CIO 2002
Area
CIO 2007
CIO 2008
CIO 2009
Input
CIO 2010
Bits 8 to 15 are not used. Node address 0 expansion outputs 0
Area
CIO 2011
to 7 are allocated bits 0 to 7. (See note 3.)
CIO 2015
Note
5-1-5
Slave Unit Normal Confirmation
Participation and Communications Error Flags
Note If there are no Slave Unit inputs for node address N+1, there will be
no node address duplication error for node address N+1. If there
are Slave Unit inputs for node address N+1, a node address dupli-
cation error will occur.
If 16 Slave Unit outputs at node address N are expanded by 8 outputs to
make a total of 24 outputs, then Output Area node address N and node ad-
dress N+1 are allocated.
Note If there are no Slave Unit outputs for node address N+1, there will
be no node address duplication error for that N+1. If there are Slave
Unit outputs for node address N+1, a node address duplication er-
ror will occur.
Allocation Example
15
14 13 12
11 10 9
8
7
6
5
4
3
Node address 0 outputs 0 to 15 are allocated bits 0 to 15.
Node address 1 outputs 0 to 15 are allocated bits 0 to 15.
Bits 8 to 15 are not used. Node address 1 expansion outputs 0
to 7 are allocated bits 0 to 7. (See note 2.)
Bits 8 to 15 are not used. Node address 0 expansion outputs 0
to 7 are allocated bits 0 to 7. (See note 1.)
Node address 1 outputs 0 to 15 are allocated bits 0 to 15.
Node address 2 outputs 0 to 15 are allocated bits 0 to 15.
(1) The 8 expansion inputs for node address 0 are allocated bits 00 to 07 of
CIO 2008 for node address 0. (Bits 08 to 15 are not used.)
(2) The 8 expansion outputs for node address 1 are allocated bits 00 to 07 of
CIO 2002 for node address 2, following node address 1. (Bits 08 to 15 of
CIO 2002 are not used.)
(3) The 8 expansion inputs for node address 2 are allocated bits 00 to 07 of
CIO 2011 for node address 3, following node address 2. (Bits 08 to 15 of
word 2011 are not used.)
• Participation Flags and Communications Error Flags in the Status Area
are used to indicate whether Slave Units are participating normally in the
network.
• Participation Flags
A Participation Flag turns ON once the corresponding Slave Unit starts
participating in the network when the System is started (i.e., when the
power is turned ON). It remains ON even if the Slave Unit stops partic-
ipating due to a communications error.
Node address
2
1
0
Output allocations
For node address 0
Output
For node address 1
allocations
For node address 2
For node address 7
Input allocations
For node address 0
Input allocations
For node address 1
Input allocations
For node address 2
For node address 3
For node address 7
Section 5-1
Node address 0 (Output 0 and input 0 allocated)
Expan-
Slave Unit
sion Unit
16 outputs
8 inputs (See note 1.)
Node address 1 (Outputs 1 and 2 and input 1 allocated)
Expan-
Slave Unit
sion Unit
16 outputs
16 inputs and 8 outputs (See note 2.)
Node address 2 (Inputs 2 and 3 allocated)
Expan-
Slave Unit
sion Unit
16 outputs
8 inputs (See note 3.)
105
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