90
Performance of Remote I/O Communications
Section 8-1
8-1
Performance of Remote I/O Communications
This section tells you about the performance of remote I/O communications
with SmartSlice I/O Terminals. Use this information when the timing of I/O is
important.
The equations in this section have these conditions.
• All Slaves must be in communications with the Master.
• The CompoNet Master Unit must not show an error.
8-1-1
I/O Response Time
The I/O response time is from when an input at an Input Slave shows at the
CompoNet Master Unit until it makes an output at an Output Slave. Both the
Input Slave and Output Slave are in the SmartSlice I/O Terminal. The ladder
program in the CPU Unit of the PLC processes the input to make the output.
Maximum I/O
Response Time
Use the equation below to calculate the maximum I/O response time (T
MAX
).
T
MAX
= T
IN
+ T
SL-IN
+ T
SL-CI
+ T
NetCyc
×2 + 0.1 ms + T
NetCycInt
+ T
CrmInMax
+
T
Cyc
×2 + T
CrmOutMax
+ T
NetOut
+ T
SL-CO
+ T
SL-OUT
+ T
OUT
T
IN
:
ON (OFF) delay time for Input Unit
T
SL
:
Communications cycle time of SmartSlice bus
T
SL-CI
:
Input data processing time for CompoNet Communications Unit
T
NetCyc
:
Communications cycle time of CompoNet network
0.1 ms:
Read time interval for input data
T
NetCycInt
:
Interrupt processing time
T
CrmInMax
: Maximum input processing time at CompoNet Master Unit
T
Cyc
:
Cycle time of CPU Unit
T
CrmOutMax
: Maximum output processing time at CompoNet Master Unit
T
NetOut
:
Part of communications cycle time given to output frames
T
SL-CO
:
Output data processing time for CompoNet Communications Unit
T
OUT
:
ON (OFF) delay time for Output Unit
Minimum I/O
Response Time
Use the equation below to calculate the minimum I/O response time (T
MIN
).
T
NetCyc
T
NetCyc
T
NetCyc
0.1
ms
T
NetCycInt
T
CrmInMax
T
NetCyc
T
NetCyc
T
NetOut
T
IN
T
OUT
T
SL
T
SL
T
SL-Cl
T
SL-CO
T
Cyc
T
Cyc
T
CrmOutMax
CPU Unit
CompoNet
communications
cycle
CompoNet
Communications
Unit
Slice bus
Input Slave
Output Slave
CompoNet
Master Unit
Summary of Contents for GRT1-CRT - 05-2008
Page 1: ...CompoNet Communications Unit Cat No W476 E1 01 SmartSlice GRT1 CRT OPERATION MANUAL ...
Page 2: ...SmartSlice GRT1 CRT CompoNet Communications Unit Operation Manual Produced May 2008 ...
Page 3: ...iv ...
Page 17: ...About this Manual xviii ...
Page 28: ...9 Specifications Section 1 4 1 4 3 Dimensions 12 23 1 25 1 61 2 69 7 58 3 8 4 3 mm ...
Page 29: ...10 Specifications Section 1 4 ...
Page 39: ...20 Switches Section 2 3 ...
Page 47: ...28 Installing the Turnback Units Section 3 2 ...
Page 99: ...80 Last Maintenance Date Section 6 12 ...
Page 113: ...94 Performance of Message Communications Section 8 2 ...
Page 127: ...108 Other Error Causes and Error Procedures Section 9 3 ...
Page 141: ...122 Power Consumption and Weight Tables Appendix D ...
Page 143: ...124 Total I O Current Consumption Table Appendix E ...
Page 147: ...128 Index ...
Page 149: ...130 Revision History ...