Appendix 2 Specifications
A-9
@ Controller Link Specifications (with NS-CLK21 Controller Link Interface
Unit Mounted)
Item Specification
Communications
method
N:N token bus
Code Manchester code
Modulation Baseband code
Synchronization Flag synchronization (conforming to HDLC frames)
Transmission path
type
Multidrop (bus)
Baud rate and
maximum transmis-
sion distance
The maximum transmission distances depends on the baud rate
setting as follows:
2 Mbits/s: 500 m
1 Mbits/s: 800 m
500 Kbits/s:1 km
Media Specified shielded twisted-pair cable
2 signal lines and 1 shield
Connections to
nodes
PLCs : Connected via terminal block
Personal computers: Connected via special connector (provided)
Max. number of
nodes
32 modes
Communications
functions
Data links and message service
Number of data link
words
· Transmission area per node:
1,000 words max. (2,000 bytes)
· Send/receive data link areas per SYSMAC CS-series PLC:
12,000 words max. (24,000 bytes)
· Send/receive data link areas per SYSMAC C200HX/HG/HE,
CVM1, or CV-series PLC:
8,000 words max. (16,000 bytes)
· Send/receive data link areas per personal computer:
32,000 words max. (64,000 bytes)
· Total send data link words on entire network:
32,000 words max. (64,000 bytes)
Data link areas Bit (CIO, and LR Area) , data memory (DM Area) , expansion data
memory (EM Area)
Message length 2,012 bytes max.
RAS functions · Polling unit backup function
· Self-diagnosis (hardware check at startup)
· Internode tests and broadcast test (via FINS commands)
· Watchdog timer
· Error log
Error correction Manchester code check
CRC check (CCITT X
16
+X
12
+X
5
+1)
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