Omron 3G8F7-CRM21, User Manual

Page: 50 / 238

30
Access to I/O Data Section 3-2
3-2 Access to I/O Data
3-2-1 Allocation of I/O Data
In the CompoNet network system, the I/O data is allocated separately for
Word IN Slave Units, Word OUT Slave Units, Bit IN Slave Units, and Bit OUT
Slave Units. It is allocated in the shared memory of the CompoNet Master
Board.
Allocation for Word IN
Slave Units and Word
OUT Slave Units
• Every 16 points of a Word IN Slave Unit or a Word OUT Slave Unit
occupies 1 word in allocation area. For example, a 32-point IN Slave Unit
occupies 2 words in allocation area for Word IN Slave Units.
• The offset address that is allocated to the shared memory is determined
by the node address.
• Word MIX Slave Units occupy the allocation areas for both of Word IN
Slave Units and Word OUT Slave Units. For example, when a Word MIX
Slave Units has 16 inputs and 64 outputs, it occupies 1 word in the
allocation area for Word IN Slave Units and 4 words in the allocation area
for Word OUT Slave Units.
• An 8-point Slave Unit also occupies 1 node or 1 word. It is allocated to the
lower byte of the 1-word, while the upper byte remains open.
Allocation area for IN Data of a Word IN Slave Unit
Allocation area for OUT Data of a Word OUT Slave Unit
Note A single allocation area shall never be occupied by plural nodes. However, as
long as the same words are not allocated to more than one Unit, the Input
Area and Output Area with numerically the same node address can be
allocated to Slave Units with different node addresses. For example, OUT1
can be allocated to the 16 outputs for a Word OUT Slave Unit set for node
address 1, and IN1can be allocated to the 16 inputs for a Word IN Slave Unit
set for node address 1.
Word address Bit 15 Bit 0
+0 [IN data of Word IN Slave Unit with node address 0]
+1 [IN data of Word IN Slave Unit with node address 1]
IN
area
+2 [IN data of Word IN Slave Unit with node address 2]
: :
+62 [IN data of Word IN Slave Unit with node address 62]
+63 [IN data of Word IN Slave Unit with node address 63]
Word address Bit 15 Bit 0
+0 [OUT data of Word OUT Slave Unit with node address 0]
+1 [OUT data of Word OUT Slave Unit with node address 1]
OUT
area
+2 [OUT data of Word OUT Slave Unit with node address 2]
: :
+62 [OUT data of Word OUT Slave Unit with node address 62]
+63 [OUT data of Word OUT Slave Unit with node address 63]