Omron 3G8F7-CRM21, User Manual

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151
Remote I/O Communications Performance Section C-1
S1 Calculation Example
Conditions
S1
=
60
×
3.38
µ
s
≈
0.202 ms
S2 is the correction coefficient that is used when more than 64 Bit IN Slave Units are
connected.
S2 = Number of connected Bit IN Slave Units
×
Correction coefficient for each Bit IN
Slave Unit
S2 Calculation Example
Conditions
S2
=
120
×
0.4
µ
s
≈
0.048 ms
T
NetIn
(Time Allotted
for IN Frames in
Communications
Cycle Time)
T
NetOut
(Time Allotted
for OUT Frame in
Communications
Cycle Time)
K = (Number of Word Output Slave Units connected
×
additional time per
Word Output Slave Unit)
+ ((Number of Bit Output Slave Units + 7)
÷
8)
×
additional time per 8 Bit
Output Slave Units)
Additional time per Word Output Slave Unit / Additional time per 8 Bit Output
Data rate Word Inputs
4.0Mbps 60 Units
Slave Unit
Type
4.0Mbps 3.0Mbps 1.5Mbps 93.75kbps
Bit IN Slave 7.47
µ
s 0.40
µ
s 4.46
µ
s -
Data rate Bit Inputs
3.0Mbps 120 Units
Data rate T
NetIn
4.0 Mbps 0.010 ms
×
(Number of Bit Input Slave Units) + S2 + 0.011 ms
×
(Number of Word Input Slave Units) + S1
3.0 Mbps 0.020 ms
×
(Number of Bit Input Slave Units) + S2 + 0.022 ms
×
(Number of Word Input Slave Units) + S1
1.5 Mbps 0.044 ms
×
(Number of Bit Input Slave Units) + S2 + 0.051 ms
×
(Number of Word Input Slave Units) + S1
93.75 kbps 0.531 ms
×
(Number of Bit Input Slave Units) + 0.657 ms
×
(Number of
Word Input Slave Units)
Data rate 4.0 Mbit/s 3.0 Mbit/s 1.5 Mbit/s 93.75 kbit/s
T
NetOut
0.013 ms + K 0.018 ms + K 0.035 ms + K 0.567 ms + K