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3. ACCESS RANGE FOR MONITORING
3.3 CC-Link System Access Range for Monitoring
Monitoring overview
The following two methods are available for monitoring by the GOT with CC-Link communication unit.
*1 This program is not required if the CC-Link parameter setting sequence program and GOT communication sequence program
satisfy the following conditions.
• Use a QCPU (Q mode) or QnACPU whose number given in the DATE field of the rating plate is "9707B" or later as the PLC
CPU of the master station.
• Use GX Developer or SW2 -GPPW and make CC-Link parameter setting and batch refresh device setting in the CC-Link
setting on the package.
For details of the connection method, refer to the following manual .
User's manual of the CC-Link master unit to be connected
*2 For whether the data can be sent to/received from the CC-Link Ver. 2 compatible station by transient transmission and cyclic
transmission, refer to the following.
■ When using CC-Link connection (intelligent device station)
POINTPOINTPOINT
In transient transmission, connection of several (five or more as a guideline) intelligent device stations (GOTs and
intelligent device units) reduces the data communication speed.
To raise the data communication speed, increase the CC-Link system, for example, and do not connect five or
more intelligent device stations to a single CC-Link system.
Monitoring method
Monitoring by transient transmission
*2
Monitoring by cyclic transmission
*2
Contents
Devices of the PLC CPU on the CC-Link system master and
local station are specified and monitored.
All remote inputs/outputs and remote registers assigned to
the Master station by CC-Link parameter setting are
specified and monitored.
Advantage
The CC-Link parameter setting sequence program is
required. However, the GOT communication sequence
program is not needed.
*1
The data communication processing speed is high.
Disadvantage
The data communication processing speed is lower than
that of cyclic transmission.
• Writing from the GOT (read command from the master
station) can be performed only to remote outputs and
remote registers assigned to the GOT of the master
station and to the GOT internal registers.
• GOT communication sequence program is required.
*1