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Network technology

CC-Link/LT Specification

    4-point
mode		 8-point
mode		 16-point
mode
CC-Link/LT specification Max. number of link points 256 points
(512 points)*		 512 points
(1024 points)*		 1024 points
(2048 points)*
Number of link points per station 4 points
(8 points)*		 8 points
(16 points)*		 16 points
(32 points)*
Link scan time
(ms)		 When 32 stations
are connected		 Number of points 128 points 256 points 512 points
2.5Mbps 0.7 0.8 1.0
625Kbps 2.2 2.7 3.8
156Kbps 8.0 10.0 14.1
When 64 stations
are connected		 Number of points 256 points 512 points 1024 points
2.5Mbps 1.2 1.5 2.0
625Kbps 4.3 5.4 7.4
156Kbps 15.6 20.0 27.8
Communication specification

Communication speed

 2.5Mbps / 625Kbps / 156Kbps
Communication system BITR method (Broadcast polling + Interval Timed Response)
Transmission path format T-branch format
Error control system CRC
Max. number of units connected 64 units
Slave station number 1 to 64
Max. number of connected modules to branch line 8 units / Branch
Inter station length Unlimited
Inter T-branch length Unlimited
Master station connection position Connected to the end of the main line
RAS functions Network diagnostics, internal loopback diagnostics, slave station disconnection, and automatic return
Connection cable Dedicated flat cable (0.75mm2×4),
Dedicated high flexible cable (0.75mm2×4),
VCTF cable
(JIS C 3306 conformance, 0.75mm2×4)

*This is the address numbers of link points in case of using the same address numbers for input and output.

CC-Link/LT wiring specification

CC-Link/LT wiring specification

Items Specifications Remarks
Communication speed 2.5Mbps 625Kbps 156Kbps  
Inter-station length Unlimited  
Max. number of
connected modules to
branch line		 8 units / Branch  
Max trunk line length 35m 100m 500m Cable length between terminators.
(Length of branch cable not included.)
Inter T-branch length Unlimited  
Max. branch line length 4m 16m 60m Overall cable length for one branch line
Overall branch line length 15m 50m 200m Overall length of all the branch lines
  • Branch lines can be used together with dedicated flat cables, VCTF cables or cables exclusively for movable portions.
  • Different types of cables cannot be used together within the main line.
  • Different types of cables cannot be used together within the same branch line.
  • Install the master station at either end of the main line.
  • Install a terminating resistor within 20 cm of the master station.
  • *1:Include the length of any branch from any branch line in the overall branch line length.
  • *2:Branch lines cannot be wired from any branch line.

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