Lb/Lw Settings - Mitsubishi Electric MELSEC Q Series Reference Manual

6.3.1

LB/LW settings

Set each station's send range in LB/LW to use it for communication using LB/LW. (
LB/LW settings can be divided into "LB/LW Setting(1)" and "LB/LW Setting(2)".
Normally, setting only "LB/LW Setting(1)" is enough for communication using LB/LW.
Set "LB/LW Setting(2)" in the following cases:
• When extending each station's send range without changing existing assignments
• When intentionally dividing each station's send range into two (e.g. within and outside the link refresh range).
If "LB/LW Setting(2)" is used, link scan time will be longer compared to using "LB/LW Setting(1)" only.
Item
Assignment Method
LB (Points/Start/End)
LW (Points/Start/End)
Equal Assignment
Identical Point Assignment
*1 The own station send range for LB/LW of a Basic model QCPU or safety CPU must be set within the range of LB/LW0 to
3FFF in "LB/LW Setting(1)".
If it is set to LB/LW4000 or higher, or set in "LB/LW Setting(2)", a LINK PARA. ERROR or a NETWORK PARAMETER
ERROR will occur when parameters are received.
The LB/LW points for each station can be set to 16384 (3FFF
When "CC IE Control Ext. Mode" is selected in the network type, LB can be set up to 32768 points (7FFF
set up to 131072 points (1FFFF
Select an LB/LW assignment method.
• Points/Start: Enter link device points and start I/O numbers.
• Start/End: Enter the start and end numbers of the link devices.
Set each station's send range in LB in 16-point units. (Start: 0
(Setting range: 0000 to 7FFF , Default: None)
H H
Set each station's send range in LW in 1-point units.
(Setting range: 0000 to 1FFFF
H H
The link device range can be equally assigned to each send range of the relevant stations.
The same points can be assigned to each station's send range in LB/LW.
H
).
H
CHAPTER 6 PARAMETER SETTING
Page 61, Section 4.1.1)
Description
*1
, Default: None)
) or less. (Total of "LB/LW Setting(1)" and "LB/LW Setting(2)")
*1
to End: F )
H H
), and LW can be
H
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