| Items | Specifications | 
| Model | CS1W-CLK23 3G8F7-CLK23-E
 CS1W-CLK21-V1 *1
 3G8F7-CLK21-EV1 *1
 | CS1W-CLK13 3G8F7-CLK13-E
 CS1W-CLK12-V1 *1
 3G8F7-CLK12-EV1 *1
 | CS1W-CLK53 3G8F7-CLK53-E
 CS1W-CLK52-V1 *1
 3G8F7-CLK52-EV1 *1
 | 
| Type | Wired (shielded twisted-pair cable) | Optical Ring (H-PCF cable) | Optical Ring (GI cable) | 
| Communications method | N:N token-bus method | N:N token-ring method (token-ring mode) N:N token-bus method (token-bus mode)
 | 
| Code | Manchester code | 
| Modulation | Baseband code | 
| Synchronization | Flag synchronization (conforms to HDLC frames) | 
| Transmission path format | Multidrop method (bus type) | Ring method (token-ring mode) Daisy-chain method (token-ring mode)
 | 
| Transmission speed | The following are the maximum transmission distances depending on
 the transmission speed.
 2 Mbits/s: 500 m
 1 Mbits/s: 800 m
 500 kbits/s: 1 km
 | 2 Mbits/s | 
| Maximum transmission distance
 | 20 km | 30 km | 
| Maximum distance between nodes
 | Not specified. (Maximum transmission distance must be satisfied for the
 entire system.)
 | Crimp-cut: 800 m Adhesive polishing: 1 km *2
 | 62.5/125 μm: 2 km 50/125 μm: 1 km
 | 
| Medium | Specified shielded twist-pair cable Two signal wires, one shield
 | H-PCF cable (two-core optical cable)
 | GI cable (two-core optical cable: 62.5/125 μm, 50/
 125 μm)
 | 
| Node connection method | PLC: Connection to terminal block Computer: Connection using special
 (supplied) connector
 | Connection using special connector (full-lock connector
 or half-lock connector)
 | Connection using ST connector
 | 
| Maximum number of nodes | 32 or 62 nodes *3 *4 | 62 *5 | 
| Applicable Programming Devices
 | CX-Integrator in CX-One, CX-Net in CX-Programmer *4, and Programming Console | 
| Communications functions | Data links and message service | 
| Number of data link words | Send words per node: 4,000 words max. (CS1W-CLK[]3), 1,000 words max. (All other Units) Number of send/receive words per node:
 12,000 words max. (Pre-Ver. 1.2)
 20,000 words max. (unit Ver. 1.2 or later)
 Total number of send words per network: 62,000 words max.
 | 
| Data link areas | PLC: Bit areas (CIO Area, Work Area, Link Area *6), Data Memory (DM), Extended DM Area (EM) Computer: FinsGateway event memory
 | 
| 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
 | 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
 Node bypass function
 Transmission path duplication (for ring method in token-ring
 mode only)
 Disconnect detection and notification (token-ring mode only)
 Node connection configuration data reading (for ring method
 in token-ring mode only)
 Duplex operation of Communications Units *7
 | 
| Error control | Manchester code check CRC check (CCITT X16+X12+X5+1)
 |