Mitsubishi QJ71LP21 Reference Manual page 86

3 SPECIFICATIONS
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(6) Transmission delay time formula
The transmission delay time is calculated based on the following system design
and conditions.
(System design, conditions)
1) CPU module:Q06HCPU
2) Total number of remote I/O stations: 8
3) Number of link devices: LX = LY = 1024 points, LB = LW = 0 point,
SB = SW = 512 points
4) Remote master station CPU module scan time: 1 ms
5) Communication speed: 10 Mbps
6) File register not used.
7) Transient transmission not used.
8) Remote master station mounts the network module to the main base unit.
9) All remote I/O stations only use the input/output module.
10) The link device per each remote I/O station is LX = LY = 128 points.
<Constants when a network module is mounted to the main base unit.>
CPU type
QnHCPU, QnPHCPU,
(a) Link refresh time (αm)
αm = KM1 + KM2
= 0.13 + 0.41
/16 + 0
= 0.41 [ms]
(b) Link scan time (LS)
LS = KB + (0.45
(LW
16)} /16
+ {LXM R + LBM R + (LWM R
+ (T
= 4.0 + (0.45
+ {1024 + 0 + (0
+ {1024 + 0 + (0
+ (0
= 11.8 [ms]
(c) I/O refresh time
T = XK/16
RIOR
+ YZ/16
= 128/16
= 0.024 [ms]
Constant
QnCPU
QnPRHCPU
{LB + LX + LY + SB + (LW
-3
10 {0 + 1024 + 1024 + 512 + (0
total number of remote I/O stations) + {LX + LY + LB +
16)} /8 0.001 + KR + {LYM R + LBM R + (LWM R
0.0003
0.001)
8) + {1024 + 1024 + 0 + (0
16)} /16
16)} /16
0.001)
0.0016 + XZ/16
0.0022
0.0016 + 0 + 128/16
KM2
KM1
–3
( 10 )
0.30 0.48
0.13 0.41
16) + (SW
16)} /16 0.0003
16)} /8
0.0003
0.0003
0.0024 + YK/16 0.0014
0.0014 + 0
MELSEC-Q
KM3
–3
( 10 )
0.60
0.53
16)} /16 + α
E
16) + (512 16)}
0.001 + 3.9
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