An introduction to the original CC-Link

 

The CC-Link field network is high performance industrial network technology, and is the
leading open fieldbus network in Asia and is growing fast in North America and Europe.
CC-Link processes both control and information data at high speed, to provide efficient,
integrated factory and process automation. It provides 10 Mbps, deterministic communication
linking a wide range of multi-vendor automation devices over a single cable..
Other user features include:

  • High immunity to electromagnetic interference (EMI)
  • Standby network master assumes network control if the primary master goes off-line
  • Bypasses faulty network devices without disrupting network traffic
  • Hot swapping of master and slave devices
  • Allows automation controllers to be programmed and monitored over the network
  • Simple communication programming
  • Reduced wiring and installation costs

Topology

CC-Link uses a RS-485 compliant interface operating on a bus type network configuration with up to 64 slave stations. In addition to bus type a T-branch and star type transmissions are also available.


CC-Link provides compatibility between multiple vendor products

CLPA provides a “memory mapped profile” that defines data for each product type. This definition includes the control signal and data layout (addressing). Multiple vendors can develop CC-Link compatible products to match this "profile". Users are then able to easily change from one product brand to another without needing to change connections or control programs.

Link scan time (at communication speed of 10 Mbps)

Estimated value:
4ms/64 stations (2048 points, 10Mbps transmission speed.
6ms/26 stations (2048 points, 512 words, 10Mbps transmission speed.

 

CC-Link transmission distance

The maximum overall cable length is 100 meters when 10 Mbps is selected. This length can be extended to 1.2 km when the network speed is 156 Kbps. The use of cable repeaters and optical repeaters allows even greater distances to be covered. CC-Link supports large-scale applications and reduces the work needed for wiring and  device installation.

Communication SpeedMaximum Cable Length
Without repeatersWithout repeaters
10 Mbps100 m4.3 km
5 Mbps160 m4.5 km
2.5 Mbps400 m5.2 km
625 kbps900 m9.9 km

 

Specification Information for CC-Link
CC-Link Specifications Version 1.1 and Version 2.0

CC-Link Version 1.1 was released as an open protocol was released in the year 2000. Version 2.0 followed in 2002 to meet the demand of large volume data communication required by areas. V2.0 has not replaced V1.1 and both continue to be available. All CC-Link network masters produced since 2002 can be used with both versions. The specification for CC-Link cable is version 1

Version 1.0

Original release of CC-Link (no longer available)
Version 1.10This version allowed more convenient inter- station cable lengths of 20 cm or
more. This specification change affects network devices and network cables.
Version 2.0

This version provides an 8-fold increase in the volume of data communication
in the system and per station.
Version 2.0 Compatibility

 

 

Maximum number of I/O
Version 1.10
Version 2.0
Remote Input Points
2048
8192
Remote Output Points
2048
8192
Remote Input Words
256
2048
Remote Output Words
256
2048

 

CC-Link specification [Versions 1.10 & 2.0]

The maximum number of occupied stations4 stations
Maximum Number of Devices per network64 Devices (See Note for Version 1.10 or 2.0)
Communication speed10M / 5M / 2.5M / 625k / 156kbps
Communication systemBroadcast Polling system
Communication mediumShielded twisted 3-Wire
Synchronization systemFrame synchronization system
Encoding systemNRZI
Transmission path formatBus format (EIA RS485 conformance)
Transmission formatHDLC conformance
Error control systemCRC (X16+X12+X5+1)

 

Specification Information [CC-Link Version Description]


The number of link points per Device
(Occupying 1 station)
Version 1.10Version 2.0
(Extended cyclic setting)

-1 time setting2 time setting4 time setting8 time setting
Remote Points In32323264128
Remote Points Out32323264128
Remote Words Out4481632
Remote Words In4481632

 


The number of link points per Device
(Occupying 2 stations)
Version 1.10Version 2.0
(Extended cyclic setting)

-1 time setting2 time setting4 time setting8 time setting
Remote Points In646496192384
Remote Points Out6464
96192384
Remote Words Out88163264
Remote Words In88

16

3264

´


The number of link points per Device
(Occupying 3 stations)
Version 1.10Version 2.0
(Extended cyclic setting)

-1 time setting2 time setting4 time setting8 time setting
Remote Points In9696160320640
Remote Points Out9696160320640
Remote Words Out1212244896
Remote Words In1212244896

 


The number of link points per Device
(Occupying 4 stations)
Version 1.10Version 2.0
(Extended cyclic setting)

-1 time setting2 time setting4 time setting8 time setting
Remote Points In128128224448896
Remote Points Out128128224448896
Remote Words Out16163264128
Remote Words In16163264128

Note for Maximum Number of Devices Version 1.10

Maximum Number of Network Slave products is 64 (in addition to the Master):
    The following equations also need to be satisfied:
     (1*a) + (2*b) + (3*c) + (4*d) = 64
      a: Number of slave products that occupy 1 station
      b: Number of slave products that occupy 2 stations
      c: Number of slave products that occupy 3 stations
      d: Number of slave products that occupy 4 stations

    (16*A) + (54*B) + (88*C) = 2304
     A: Number of Remote I/O products
     B: Number of Remote Device products
     C: Number of Local (Stand-by Master) and Intelligent Device product

Note for Maximum Number of Devices Version 2.0
Maximum Number of Network Slave products are 64 (in addition to the Master):

 The following equations also need to be satisfied:
(a + a2 + a4 + a8) +
(b + b2 + b4 + b8)*2 +
(c + c2 + c4 + c8)*3 +
(d + d2 + d4 + d8)*4 = 64

(a*32 + a2*32 + a4*64 + a8*128) +
(b*64 + b2*96 + b4*192 + b8*384) +
(c*96 + c2*160 + c4*320 + c8*640) +
(d*128 + d2*224 + d4*448 + d8*896) = 819

(a*4 + a2*8 + a4*16 + a8*32) +
(b*8 + b2*16 + b4*32 + b8*64) +
(c*12 + c2*24 + c4*48 + c8*96) +
(d*16 + d2*32 + d4*64 + d8*128) = 2048

      a: The number of units with 1 occupied station and 1 time setting
b: The number of units with 2 occupied stations and 1 time setting
c: The number of units with 3 occupied stations and 1 time setting
d: The number of units with 4 occupied stations and 1 time setting
a2: The number of units with 1 occupied station and 2 times setting
b2: The number of units with 2 occupied stations and 2 times setting
c2: The number of units with 3 occupied stations and 2 times setting
d2: The number of units with 4 occupied stations and 2 times setting
a4: The number of units with 1 occupied station and 4 times setting
b4: The number of units with 2 occupied stations and 4 times setting
c4: The number of units with 3 occupied stations and 4 times setting
d4: The number of units with 4 occupied stations and 4 times setting
a8: The number of units with 1 occupied station and 8 times setting
b8: The number of units with 2 occupied stations and 8 times setting
c8: The number of units with 3 occupied stations and 8 times setting
d8: The number of units with 4 occupied stations and 8 times setting
 

(16*A) + (54*B) + (88*C) = 230

      A: Number of Remote I/O products
B: Number of Remote Device products
C: Number of Local (Stand-by Master) and Intelligent Device products

 

CC-Link Version 1.10 cable (Using 110Ω terminators)

If the entire system consists of Version 1.10 / 2.0 devices and Version 1.10 cables, then:

  1. The shortest inter-station cable length is 20 cm under all conditions.
  2. Flexibility of cable length reduces work on wiring and setting devices.
  3. With no extra cable length required when devices are put adjacently, you can use space effectively.
  4. Different brand cables can be used within a single system.

If a system uses any module(s) compatible with Version 1.0 or cables compatible with Version 1.0, then follow the Version 1.0 specification for maximum overall cable extension length and inter-station cable length.

 

CC-Link Version 1.10 cable (Using 110Ω terminators)

Communication speedInter-station cable lengthMaximum overall cable extension length
156 kbps≥ 20 cm1200m
625 kbps≥ 20 cm900m
2.5 Mbps≥ 20 cm400m
5 Mbps≥ 20 cm160m
10 Mbps≥ 20 cm100m

Specification for T-Branch Transmission

 

Instructions for Cable use

Version 1.10 cable is recommended for use with products of Version 1.10 or higher (Version 1.10, Version 2.0).
If the entire system consists of the products of Version 1.10 or higher and uses Version 1.10 cable, then the required length of each inter-station cable is 20 cm or more. Different brand cables can be used within a single system. (See CC-Link specification for inter-station cable length and maximum overall cable extension length.) If a system uses either Version 1.0 devices and/or Version 1.0 cable, then follow the CC-Link Version 1.0 specification for inter-station cable length and maximum overall cable extension length. A different brand cable within a single system is not recommended. For a complete installation guide, including the different cable requirements, see the download page and read the CC-Link Installation Guide.

Specification for T-Branch Transmission

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 nonpowered 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.

Communication Speed & Cable Length for T-Branch Connection
Communication speed156kbps625kbps2.5M, 5M & 10M network speeds not allowed

Station-to-Station Cable Length
Between master and local stations, intelligent device station, and adjacent stations≥ 1mFor a system configured only with remote I/O stations and remote device stations
≥ 2mFor a system configuration that contains local stations or intelligent device stations
Between remote I/O stations and remote device stations≥ 30cm
Maximum No. of stations connected per branch line6See communication specification for the total number of connected stations
Maximum trunk line length500m100mThe length of the cable between terminating resistors. The branch line length is not included.
Total branch line length200m50mTotal length of all branch lines.
Maximum individual branch line length8mCable length per branch line
Total transmission distance700m150m(Trunk line length + all branch line lengths)