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14
Specifications and Configurations Section 1-2
1-2-3 Communications Specifications
Wired System
Note 1. The maximum distance between nodes depends on the connector and ca-
ble processing methods.
2. At least one Repeater Unit is required to construct networks that uses a
node address higher than 32. The following Controller Link Units/Support
Boards must also be used, and the Wired Network 62 Node Enable Bit of
the DM Parameter Area software switch of all nodes must be turned ON
(62 nodes max.).
CS1W-CLK21-V1, CJ1W-CLK21-V1, and 3G8F7-CLK21-V1
3. 62,000 data link words applies to configurations of 62 nodes.
Items Specifications
Communications method N:N token bus
Code Manchester code
Modulation Baseband code
Synchronization Flag synchronization (conforms to HDLC frames)
Transmission path form Multi-drop bus
Baud rate and maximum
transmission distance
The maximum transmission distance varies with the baud rate as follows:
2 Mbps: 500 m
1 Mbps: 800 m
500 Kbps: 1 km
Media Specified shielded twisted-pair cable
Number of signal lines: 2, shield line: 1
Node connection method PLC: Connected to a terminal block
IBM PC/AT or compatible: Connected via a special connector (included)
Maximum number of nodes 32 or 62 nodes (See note 2.)
Communications functions Data links and message service
Number of data link words
Transmission area per node: 1,000 words (2,000 bytes) max.
Data link area (send/receive words) per node
CS/CJ Series: 20,000 words max. (unit Ver. 1.2 or later)
12,000 words max. (pre-Ver. 1.2)
C200HX/HG/HE, CVM1/CV, CQM1H: 8,000 words max.
Personal computer: 32,000 or 62,000 words max. (See note 3.)
Number of data link words in one network (total transmission):
32,000 words (64,000 bytes) or 62,000 words max. (See note 3.)
Data link areas Bit-access areas (IR, AR, LR, CIO), DM Area (DM), and extended DM Area (EM)
Message length 2,012 bytes max. (including the header)
RAS functions Polling node backup function
Self-diagnosis function (hardware checking at startup)
Echoback test and broadcast test (using the FINS command)
Watchdog timer
Error log function
Error control Manchester code check
CRC check (CCITT X
16
+ X
12
+ X
5
+ 1)