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:

 

 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.

CC-Link transmission distance

                                    Basic specification

                                    Optical repeater (G1)

                                    Cable repeater

 

 

 

 

 

 

 

Communication Speed

Maximum Cable Length

Without repeaters

Without repeaters

10 Mbps

100 m

4.3 km

5 Mbps

160 m

4.5 km

2.5 Mbps

400 m

5.2km

625 kbps

900 m

9.9 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 1.1

 

Version 1.0

Original release of CC-Link (no longer available)

Version 1.10

This 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 stations

4 stations

Maximum Number of Devices per network

64 Devices (See Note for Version 1.10 or 2.0)

Communication speed

 

10M / 5M / 2.5M / 625k / 156kbps

Communication system

 

Broadcast Polling system

Communication medium

Shielded twisted 3-Wire

Synchronization system

 

Frame synchronization system

Encoding system

 

NRZI

Transmission path format

Bus format (EIA RS485 conformance)

Transmission format

 

HDLC conformance

Error control system

CRC (X16+X12+X5+1)

 

Specification Information [CC-Link Version Description]

 

 

The number of link points per Device
  (Occupying 1 station)

 

Version 1.10

Version 2.0
    (Extended cyclic setting)

 

-----

1 time
setting

2 times
setting

4 times
setting

8 times
setting

Remote Points In

32

32

32

64

128

Remote Points Out

32

32

32

64

128

Remote Words Out

4

4

8

16

32

Remote Words In

4

4

8

16

32

 

 

 

 

 

 

 

 

 

 

 

The number of link points per Device
  (Occupying 2 stations)

 

Version 1.10

Version 2.0
    (Extended cyclic setting)

 

-----

1 time
setting

2 times
setting

4 times
setting

8 times
setting

Remote Points In

64

64

96

192

384

Remote Points Out

64

64

96

192

384

Remote Words Out

8

8

16

32

64

Remote Words In

8

8

16

32

64

 

 

 

 

The number of link points per Device
  (Occupying 3 stations)

 

Version 1.10

Version 2.0
    (Extended cyclic setting)

 

-----

1 time
setting

2 times
setting

4 times
setting

8 times
setting

Remote Points In

96

96

160

320

640

Remote Points Out

96

96

160

320

640

Remote Words Out

12

12

24

48

96

Remote Words In

12

12

24

48

96

 

 

 

The number of link points per Device
  (Occupying 4 stations)

 

Version 1.10

Version 2.0
    (Extended cyclic setting)

 

-----

1 time
setting

2 times
setting

4 times
setting

8 times
setting

Remote Points In

128

128

224

448

896

Remote Points Out

128

128

224

448

896

Remote Words Out

16

16

32

64

128

Remote Words In

16

16

32

64

128

 

 

 

 

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 products

 

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) =  2304
                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.

 

 

Communication speed

Inter-station
cable length

Maximum overall  cable extension length

156 kbps

≥ 20 cm

1200m

625 kbps

≥ 20 cm

900m

2.5 Mbps

≥ 20 cm

400m

5 Mbps

≥ 20 cm

160m

10 Mbps

≥ 20 cm

100m

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

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 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.

Communication Speed & Cable Length for T-Branch Connection

Communication speed

156kbps

625kbps

2.5M, 5M & 10M network speeds not allowed

 

Station-to-Station Cable Length

Between master and local stations, intelligent device station, and adjacent stations

≥ 1m

For a system configured only with remote I/O stations and remote device stations

≥ 2m

For 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 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

8 m

Cable length per branch line

Total transmission distance

700 m

150 m

(Trunk line length + all branch line lengths)