43
Simple I/O Allocation
Section 4-2
Note
1.
Individual bits will be enabled only through the maximum number of con-
nected Temperature Controllers set on the rear panel rotary switch.
2.
Words will be allocated only through the maximum number of connected
Temperature Controllers.
Example:
If the maximum number of connected Temperature Controllers is 10, then
the allocated OUT Area will be the 28 words from, i.e., from the first word
to the first word + 27 words.
4-2-3
Allocating Data in the Master
Data is allocated in the master in the same way as other slaves using either
fixed allocations or user-set allocations.
Note The sizes of the IN and OUT Areas allocated to the DeviceNet Communica-
tions Unit are larger than for other slaves, so make sure that the allocated
words are within the DeviceNet Area and do not overlap with words used by
other slaves.
Fixed Allocations
When fixed allocations are used, the location for allocated data is automati-
cally determined according to the node address of the DeviceNet Communi-
cations Unit. Fixed allocations can be set without the Configurator.
With fixed allocations, however, each node address is allocated one word.
Therefore, the node addresses allocated to the DeviceNet Communications
Unit cannot be used by other nodes, as shown below.
• IN Area
Allocated 16 to 46 words, therefore, uses node addresses 16 to 46.
• OUT Area
Allocated 8 to 38 words, therefore, uses node addresses 8 to 38.
User-set Allocations
With user-set allocations, the Configurator can be used to allocate I/O to the
DeviceNet Communications Unit in any location of the CPU Unit's I/O memory
area.
The configuration of the DeviceNet Communications Unit's allocation data is
fixed, so the data can be used by merely allocating it in the master. For actual
allocating methods, refer to 4-4 Allocating Data in the Master.
Note
1.
When performing user-set allocations from a DeviceNet Configurator, use
Ver. 2.31 or later.
First word + 25 words
Unit 9, Ch2 SP (type number 123) (See note 2.)
First word + 26 words
Unit 10, Ch1 SP (type number 123) (See note 2.)
First word + 27 words
Unit 10, Ch2 SP (type number 123) (See note 2.)
First word + 28 words
Unit 11, Ch1 SP (type number 123) (See note 2.)
First word + 29 words
Unit 11, Ch2 SP (type number 123) (See note 2.)
First word + 30 words
Unit 12, Ch1 SP (type number 123) (See note 2.)
First word + 31 words
Unit 12, Ch2 SP (type number 123) (See note 2.)
First word + 32 words
Unit 13, Ch1 SP (type number 123) (See note 2.)
First word + 33 words
Unit 13, Ch2 SP (type number 123) (See note 2.)
First word + 34 words
Unit 14, Ch1 SP (type number 123) (See note 2.)
First word + 35 words
Unit 14, Ch2 SP (type number 123) (See note 2.)
First word + 36 words
Unit 15, Ch1 SP (type number 123) (See note 2.)
First word + 37 words
Unit 15, Ch2 SP (type number 123) (See note 2.)
Address
Item
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Страница 157: ...142 Index Unit status 57 85 user set allocations 43 61 V variable types C0 51 C1 51 C3 52 ...
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