149
Remote I/O Communications Performance
Section C-1
C-1-3
Descriptions of Parameters
Precautions for Correct Use
When you calculate the parameters, do not use the actual numbers of Units
for values such as the number of Word Output Slave Units connected. Rather,
use the number of occupied nodes that is specified when the communications
cycle is started.
T
IN
(Input Slave Unit
Input Delay Time)
T
OUT
(Output Slave
Unit Output Delay
Time)
For details on input/output delay times for individual Slave Units, refer to
the input specifications for individual Slave Units in the CompoNet
Slave Unit Operation Manual (Cat. No. W457).
T
NetCyc
(Communications
Cycle Time)
The figures in parentheses are when message communications are not used.
G = (Number of Word Output Slave Units connected
×
additional time per
Word Output Slave Unit)
+ (Number of Word Input Slave Units
×
additional time per Word Input Slave Unit)
+ (Number of Bit Output Slave Units
×
additional time per Bit Output Slave Unit)
+ (Number of Bit Input Slave Units
×
additional time per Bit Input Slave Unit)
Additional Time per Unit by Slave Unit Type
G Calculation Example
T
IN
Input Slave Unit input delay time
T
OUT
Output Slave Unit output delay time
T
NetCyc
Communications cycle time
T
NetIn
Time allotted for IN frames in communications cycle time
T
NetOut
Time allotted for OUT frame in communications cycle time
T
CrmIn
Input processing time at the Master Board
T
CrmOut
Output processing time at the Master Board
T
RelAcc
Processing time to release an access right
T
PC
Time for a PC to process the application
Data rate
4.0 Mbit/s
3.0 Mbit/s
1.5 Mbit/s
93.75 kbit/s
Communications
cycle time
0.74 ms + G +
S1 + S2
(0.57ms + G +
S1 + S2)
0.78 ms + G +
S1 + S2
(0.57ms + G +
S1 + S2)
1.80 ms + G +
S1 + S2
(1.40ms + G +
S1 + S2)
23.82 ms+ G
+ S1 + S2
(16.11ms + G
+ S1 + S2)
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
Word Input Unit
11.81
µ
s
22.56
µ
s
51.53
µ
s
657.50
µ
s
Bit Output Unit
0.57
µ
s
0.74
µ
s
1.42
µ
s
21.25
µ
s
Bit Input Unit
10.25
µ
s
20.64
µ
s
44.37
µ
s
531.09
µ
s
Содержание 3G8F7-CRM21
Страница 4: ...iv...
Страница 10: ...x TABLE OF CONTENTS...
Страница 30: ...10 Specifications Section 1 7 1 7 3 Dimensions 3G8F7 CRM21 PCI unit mm 3G8F8 CRM21 CompactPCI unit mm...
Страница 46: ...26 Connecting the Communications Power Supply Cables Section 2 4...
Страница 74: ...54 Board Hardware Error Notification Section 4 8...
Страница 173: ...153 APPENDIX D Sample Program D 1 Sample Program 154...
Страница 230: ...210 Wiring for Power Supply Section E 5...
Страница 234: ...214 Index...
Страница 236: ...216 Revision History...
Страница 237: ......