Omron 3G8F7-CRM21, User Manual

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152
Remote I/O Communications Performance Section C-1
Slave Units
K Calculation Example
Conditions
K =
(
7
×
5.37
µ
s) + (
2
×
5.37
µ
s
)
≈
0.048 ms
T
CrmIn
(Input
Processing Time at
Master Board)
M = (Number of Word Output Slave Units connected
×
1.09
µ
s)
+ (Number of Word Input Slave Units connected
×
4.53
µ
s)
+ (Number of Bit Output Slave Units connected
×
0.56
µ
s)
+ (Number of Bit Input Slave Units connected
×
5.23
µ
s)
M Calculation Example
Conditions
M =
(
8
×
1.09
µ
s
) + (16
×
4.53
µ
s
) + (16
×
0.56
µ
s
) + (8
×
5.23
µ
s
)
≈
0.132 ms
T
CrmOut
(Output
Processing Time at
Master Board)
T
CrmOut
= 24.74
µ
s
+ (Number of Word Output Slave Units
×
0.46
µ
s
)
+ (((Number of Bit Output Slave Units + 7)
÷
8)
×
0.55
µ
s
)
T
RelAcc
(Processing
Time to Release an
Access Right)
T
RelAcc
= 6.91
µ
s
+ (Number of Word Output Slave Units
×
0.46
µ
s
)
+ (((Number of Bit Output Slave Units + 7)
÷
8)
×
0.55
µ
s
)
T
PC
(Time for a PC to
Process the
Application)
Measure the process time for an actual application.
Data rate
Slave Unit Type
4.0 Mbit/s 3.0 Mbit/s 1.5 Mbit/s 93.75 kbit/s
Word Output Unit 4.06
µ
s 5.37
µ
s 10.88
µ
s 170.93
µ
s
Bit Output Unit 4.06
µ
s 5.37
µ
s 10.88
µ
s 170.93
µ
s
Data rate Word Outputs Word Inputs Bit outputs Bit inputs
3.0 Mbit/s 7 Units 8 Units 9 Units 10 Units
Data rate 4.0 Mbit/s 3.0 Mbit/s 1.5 Mbit/s 93.75 kbit/s
T
CrmIn
0.47 ms + M 0.52 ms + M 0.77 ms + M 7.32 ms + M
Data rate Word Outputs Word Inputs Bit outputs Bit inputs
3.0 Mbps 8 Units 16 Units 16 Units 8 Units