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CC-Link Safety specification

Specifi cations
  Ver. 1.12 (CC-Link Safety) Ver. 1.00 (Reference)
Communication speed 10M/5M/2.5M/625K/156Kbps
Communication method Broadcast polling
Synchronization method Frame synchronization method
Encoding method NRZI
Transmission path format Bus format (EIA RS485 compliant)
Transmission format HDLC compliant
Error control system CRC16 (X16+X12+X5+1))
CRC32*1 -
Maximum number of link points S-RY: 2,048bits
S-RX: 2,048bits
S-RWw: 128words
S-RWr: 128words

Note: When the system confi guration includes standard stations, the maximum number of safety station link points decreases. (Refer to the next page.)		 RY: 2,048bits
RX: 2,048bits
RWw: 256words
RWr: 256words
Number of link points per module Refer to Table 5.6. Refer to Table 5.7.
Maximum number of occupied stations 2 stations 4 stations
Transient transmission
(per 1 LS)		 Not applicable 960 bytes, maximum [150 byte M*2 ID/L*3], 34 bytes (ID/L M)]
Number. of connected modules (1×a)+(2×b)+(3×c)+(4×d)≤ 64 stations
a: No. of modules with 1 occupied station
b: No. of modules with 2 occupied stations
c: No. of modules with 3 occupied stations
d: No. of modules with 4 occupied stations
(16×A)+[54×(B+D+E)]≤ 2,304
A: No. of standard remote I/O stations
B: No. of standard remote device stations
D: No. of safety remote I/O stations
E: No. of safety remote device stations

Note: With a confi guration of safety stations only, the maximum number of connected stations is 42.		 (16×A)+(54×B)+(88×C)≤ 2,304
A: No. of standard remote I/O stations
B: No. of standard remote device stations
C: No. of standard local stations and standard intelligent device stations
Slave station numbers 1 to 64
Cable CC-Link dedicated cable (shielded 3-wire twisted pair cable)
  • CRC32 generating polynomial: X32+X26+X23+X22+X16+X12+X11+X10+X8+X7+X5+X4+X2+X+1(identical to IEEE802.3)
  • Standard master station
  • Standard intelligent device station / Standard local station
    Of the above-described specifi cations, the communication speed and number of connected modules do not necessarily require all the specifi cation elements stated.
Table 5.6 No. of Link Points Per Safety Slave Station in Safety Protocol (Ver. 1.12)
Device 1 Occupied Station 2 Occupied Stations
S-RX/S-RY 32 bits each 64 bits each
S-RWw/S-RWr   4 words each
Table 5.7 No. of Link Points Per Slave Station in Standard Protocol (Ver. 1.00)
Device 1 Occupied
Station		 2 Occupied
Stations		 3 Occupied
Stations		 4 Occupied
Stations
RX/RY 32 bits each 64 bits each 96 bits each 128 bits each
RWw/RWr 4 words each 8 words each 12 words each 16 words each
  • No. of link points with a system confi guration comprising safety stations only (1) (With the maximum number of safety station link points)
    • No. of connected safety stations with 2 occupied stations: 32 modules
    • No. of S-RY and S-RX link points: 64 bits × 32 modules = 2,048 bits (maximum)
    • No. of S-RWw and S-RWw link points: 4 words × 32 modules = 128 words (maximum)
  • No. of link points with a system confi guration comprising safety stations only (2)
    • No. of connected safety stations with 1 occupied stations: 42 modules
    • No. of S-RY and S-RX link points: 32 bits × 42 modules = 1,344 bits
    • No. of S-RWw and S-RWr link points: 0 words × 42 modules = 0 words
  • No. of link points with a system that includes standard stations
    • No. of connected standard stations with 2 occupied stations: 1 module, number of connected safety stations with 2 occupied stations: 30 modules
    • No. of S-RY and S-RX link points: 64 bits × 30 modules = 1,920 bits
    • No of RY and RX link points: 64 bits × 1 module = 64 bits
    • No. of S-RWw and S-RWr link points: 4 words × 30 modules = 120 words
    • No. of RWw and RWr link points: 8 words × 1 module = 8 words

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