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CHAPTER 7 PARAMETER SETTING
7
7.3 Network Configuration Setting
button
Set link scan mode and block data assurance per station.
*1 The sequence scan must be constant as well.
Set "Constant Scanning" in the "PLC RAS" of the
PLC Parameter window.
(2) Loopback Function Setting
Select whether to use the loopback function. ( Page 121,
Section 8.6) To configure a network in ring topology, select the
checkbox.
(3) Block Data Assurance per Station
Select whether to assure data integrity on a station basis in link
refresh between the safety CPU module and the master/local
module. ( Page 106, Section 8.2.3)
• Link Scan Mode Setting:
Asynchronous, Synchronous
(Default: Asynchronous)
• Loopback Function Setting:
Selected (Use)/not selected
(Default: Not selected)
• Block Data Assurance per Station:
Selected (Assure Block Data)/not
selected
(Default: Selected)
Item Description Setting range
(1) Link Scan Mode Setting
Item Description
Asynchronous
Link scan is performed asynchronously with the
sequence scan of the safety CPU module.
Select this item to shorten input transmission delay
time when sequence scan takes much time than link
scan. Note that output transmission delay time will
become longer.
Constant Scan
Cyclic transmission is performed punctually. Link scan
time will be the constant link scan time set in this
setting.
However, when the actual link scan time is longer than
the specified link scan time, cyclic transmission is
performed by actual link scan time.
While constant link scan is used to keep link scan time
constant, the transmission delay time is not kept
constant by this function. To keep transmission delay
time constant, select "Synchronous".
Synchronous
Link scan is performed synchronously with the
sequence scan of the safety CPU module. Select this
item in the following cases:
• To shorten output transmission delay time (Note
that when sequence scan takes much time than link
scan, input transmission delay time will become
longer.)
• To keep transmission delay time constant
*1