The figures below show the network requirements when using T-Branch connections, and when not using the powered repeater units.
Repeater is not used
When a repeater is not used and a T-Branch branch line is incorporated into the network configuration, the maximum network speed is 625kbps. When a repeater is not used, a branch line (T-Branch) can not branch off from another branch line.
Repeater is used
Using a repeater enables the user to connect a branch at every communication speed. Using a repeater also allows the user to extend cable transmission distance. If a repeater is used and a branch line is incorporated into the network configuration using only a T-Branch connector (not a powered repeater), the maximum network speed is again only 625kbps. Only if all branch line connections incorporate a repeater, is the network capable of operating at all communication speeds.
NOTE: When repeater is used, the specific repeater requirements are not specific to CC-Link; it depends upon the type of repeater used.
NOTE: Depending upon the repeater module, a Terminating Resistor may be necessary at the end of the branch connection, see the specific repeater module specifications for connection requirements.
Star Configuration
A Star Configuration is considered a modification of a branch connection; with multiple connections at one point where the interval between branch connections is zero. A non-powered T-Branch hub at the multiple branch connection point may be used for network speeds less than 2.5Mbps. The use of a powered repeater hub at the multiple branch connection point is required for network speeds greater than 625kbps. Using a powered repeater also allows the user to extend cable transmission distance.
NOTE: Depending upon the Repeater hub module, a Terminating Resistor may be necessary at the end of the branch connection, see the Repeater module specifications for Terminating Resistor connection requirements.
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Communication Speed & Cable Length for T-Branch Connection |
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| Communication speed | 156kbps | 625kbps | 2.5M, 5M & 10M network speeds not allowed |
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Station-to-Station Cable Length |
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| Between master and local stations, intelligent device station, and adjacent stations |
≥ 1m |
For a system configured only with remote I/O stations & remote device stations | |
| Between master and local stations, intelligent device station, and adjacent stations |
≥ 2m |
For a system configuration that contains local stations or intelligent device stations | |
| Between remote I/O stations and remote device stations |
≥ 30cm |
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| Maximum No. of stations connected per branch line |
6 |
See communication specification for the total number of connected stations | |
| Maximum trunk line length |
500m |
100m |
The length of the cable between terminating resistors. The branch line length is not included. |
| Total branch line length |
200m |
50m |
Total length of all branch lines. |
| Maximum individual branch line length |
8m |
Cable length per branch line | |
| Total transmission distance |
700m |
150m |
Trunk line length + all branch line lengths |
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Communication Speed and Cable Length for Repeater Connection |
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| Communication speed | 156Kbps | 625Kbps | 2.5Mbps | 5Mbps | 10Mbps |
| Station to station cable length | Same as standard CC-Link specification | ||||
| Maximum No. of stations connected to the branch line (Per branch) |
Not limited (remain within CC-Link specification) | ||||
| Maximum trunk line length | Total Trunk and Branch length not to exceed Transmission distance of CC-Link system |
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| Maximum branch line length | Total Trunk and Branch length not to exceed Transmission distance of CC-Link system |
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| Total Number of devices on a segment branch | 10 | ||||
| Total transmission distance (Trunk line length + branch line length) Version 1.10 cable |
13200m | 9900m | 4400m | 1760m | 1100m |
| Total transmission distance (Trunk line length + branch line length) Version 1.00 cable |
13200m | 6600m | 2200m | 1650m | 1100m |
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Communication Speed & Cable Length for SI/QSI Optical Repeater Connection |
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| Communication speed | 156Kbps | 625Kbps | 2.5Mbps | 5Mbps | 10Mbps |
| Station to station cable length | Same as standard CC-Link specification | ||||
| Maximum No. of stations connected to the branch line (Per branch) |
Not limited (remain within CC-Link specification) | ||||
| Maximum trunk line length | Total Trunk and Branch length not to exceed Transmission distance of CC-Link system |
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| Maximum branch line length | Total Trunk and Branch length not to exceed Transmission distance of CC-Link system |
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| Total Number of devices on a segment branch | 3 | ||||
| Maximum fiber optic cable length between repeaters | 500m (SI optical fiber cable) 1000m (QSI optical fiber cable) |
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| Total transmission distance (QSI optical cable) |
7800m | 6600m | 4600m | 3640m | 3400m |
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Communication Speed & Cable Length for GI Optical Repeater Connection |
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| Communication speed | 156Kbps | 625Kbps | 2.5Mbps | 5Mbps | 10Mbps |
| Station to station cable length | Same as standard CC-Link specification | ||||
| Maximum No. of stations connected to the branch line (Per branch) |
Not limited (remain within CC-Link specification) | ||||
| Maximum trunk line length | Total Trunk and Branch length not to exceed Transmission distance of CC-Link system |
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| Maximum branch line length | Total Trunk and Branch length not to exceed Transmission distance of CC-Link system |
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| Total Number of devices on a segment branch | 2 | ||||
| Maximum fiber optic cable length between repeaters | 2000m | ||||
| Total transmission distance (QSI optical cable) |
7600m | 6700m | 5200m | 4480m | 4300m |
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