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MELSEC-Q
3 SPECIFICATIONS
(4) Link scan time
Link scan time is based on a calculation of the following factors.
• Link device allotment points
• Number of stations connected
[Link scan time]
[Communication speed: 10 Mbps]
LS = KB + (0.45
total number of stations) + {LX + LY + LB + (LW 16)} /8 0.001 + KR
+ {LY
M
R
+ LB
M
R
+ (LW
M
R
16)} /16
0.0003
+ {LX
M
R
+ LB
M
R
+ (LW
M
R
16)} /16
0.0003
+ (T
0.001) + (F
4) [ms]
[Communication speed: 25 Mbps]
LS = KB + (0.40
total number of stations) + {LX + LY + LB + (LW 16)} /8 0.0004 + KR
+ {LY
M
R
+ LB
M
R
+ (LW
M
R
16)} /16
0.0003
+ {LX
M
R
+ LB
M
R
+ (LW
M
R
16)} /16
0.0003
+ (T
0.0004) + (F
4) [ms]
LS : Link scan time
KB, KR : constants
Total remote I/O
stations
1 to 8 9 to 16 17 to 24 25 to 32 33 to 40 41 to 48 49 to 56 57 to 64
KB 4.0 4.5 4.9 5.3 5.7 6.2 6.6 7.0
KR 3.9 3.1 2.6 2.3 1.7 1.1 0.6 0.0
LX : Total number of link inputs (LX) being used by all stations. 1
LY : Total number of link outputs (LY) being used by all stations.
1
LB : Total number of link relay (LB) being used by all stations
1
LW : Total number of link register (LW) being used by all stations
1
LYM
R
: Total number of link outputs (LY) being used by stations in M R
direction
1
LBM
R
: Total number of link relay (LB) being used by stations in M R
direction
1
LWM
R
: Total number of link register (LW) being used by stations in M R
direction
1
LXM
R
: Total number of link input (LX) being used by stations in M R
direction
1
LBM
R
: Total number of link relay (LB) being used by stations in M R
direction
1
LWM
R
: Total number of link register (LW) being used by stations in M R
direction
1
T : Maximum number of bytes transmitting during one link scan
2
F : Number of stations that return to system (available only when an
error has occurred. Maximum number of stations that return to
system in a link scan (setting)
3)
1: It ranges from the first address to the end of the device with allocation setting
by the common parameters. (If there are empty areas midway, they are
included in the number)
2: If simultaneous transient transmissions are performed from multiple stations
during one link scan, it totals the data length of the sending and receiving
frames. 0 when not used.
3: Set the maximum number of stations that return to system in a link scan
using the supplementary settings in the common parameters. (Refer to
section 5.1.4.)
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