9
DEDICATED INSTRUCTIONS
9.2 Precautions for Dedicated Instructions
9.2.2 Precautions for Link Dedicated Instructions
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9.2.2
Precautions for Link Dedicated Instructions
The following explains precautions for using link dedicated instructions.
(1) When executing multiple link dedicated instructions at the same time
When executing multiple link dedicated instructions at the same time, make sure that
the channels for them are not duplicated.
Link dedicated instructions with identical channel settings cannot be used at the same
time.
If execution of these instructions is attempted at the same time, they will not be
executed.
(a) Channels
Data handled with link dedicated instructions are stored in channel areas.
Using multiple channels allows simultaneous access from the own station to
multiple other stations, and simultaneous reading and writing to the same network
module.
(b) Number of channels and number of simultaneously-executable link dedicated
instructions
A CC-Link IE controller network module has ten channels that are available for
link dedicated instructions
*1
Up to ten instructions can be simultaneously executed if channels are not
duplicated.
* 1 Channels 9 and 10 are used for READ/SREAD/WRITE/SWRITE instructions.
(c) Example of channel use
1) When simultaneously accessing multiple other stations from the own station,
change the channel setting of the own station for each request target.
2) When making access mutually between the own station and another station,
change the channel of the own station for each link dedicated instruction.
Figure 9.2 Simultaneously accessing multiple other stations from the own station (READ and WRITE instructions)
Figure 9.3 Making access mutually between own and another stations (SEND and RECV instructions)
Channel 1: Write to station No.1
Station No.3
(Own station)
Station No.1
(Other station)
Station No.2
(Other station)
Channel 2: Read from station No.1
Channel 3: Write to station No.2
Channel 4: Read from station No.2
Channel 1
Channel 2
Channel 3
Channel 4
WRITE
READ
WRITE
READ
Station No.1
(own station)
Channel 1: For send
Channel 1: For receive
Channel 1
SEND
Station No.2
(other station)
Channel 1
RECV
Channel 3: For receive
Channel 3: For send
Channel 3
RECV
Channel 3
SEND
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