Справочник Пользователя для Mitsubishi Electronics AJ65BT-D75P2-S3
3 - 34
MELSEC-A
3 SPECIFICATIONS AND FUNCTIONS
(2) When master module is QJ61BT11N
(a) Calculation
expression
Details
Calculation expression (Unit: ms)
Master module D75P2
(write (RIWT command))
(write (RIWT command))
OT + LS {BC + (number of write points
*1
+ 16)/72
*2
1.13}
Master module D75P2
(read (RIRD command))
(read (RIRD command))
OT + LS {BC + (number of read points
*1
+ 16)/16
*2
1.067}
*1: Set in word unit
*2: Rounded up to the one place
*2: Rounded up to the one place
OT : QCPU dedicated command processing time
QnCPU
: 1[ms]
QnHCPU :
0.5[ms]
SM : Scan time of master module sequence program
LS : Link scan time (refer to the Master Module User's Manual)
BC
LS : Link scan time (refer to the Master Module User's Manual)
BC
156kbps 625kbps 2.5Mbps 5Mbps 10Mbps
6 7 9 11 12
(b) Calculation
example
The following example calculates the transmission delay time taken when
"
"
Md.30
Machine feed value" (2 words) is read from the D75P2 when the
Q06HCPU is used.
When SM is 20ms, transmission speed is 10Mbps, and only one D75P2 is
connected
connected
LS : 1.8ms (for the calculation expression, refer to "(2) Calculation
example in Cyclic transmission")
Transmission delay time = OT + LS {BC + (2 + 16)/16 1.067}
= 0.5 + 1.8 {12 + (2 + 16)/16 1.067}
= 0.5 + 1.8 14.134
= 0.5 + 1.8 14.134
25.9[ms]
However, when data is read from the buffer memory whose update timing is at
56.8ms intervals
56.8ms intervals
*1
, data after a maximum of 25.9 + 56.8 = 82.7ms is read as
shown below depending on the read timing.
*1
Md.37
update timing is at 910ms intervals.
D75P2 update timing
56.8ms
56.8ms
56.8ms
56.8ms
Md. 30 Machine feed value
1)
Read
execution
Read
complete
25.9+1) (ms)