Use Ethernet to implement various communications protocols.
• Implement FINS message communications using UDP/IP or TCP/IP with a user application on a host computer or with Support Software, such as the CX-Programmer.
• Use the clock on an SNTP server to automatically adjust the clocks in the PLCs connected to the Ethernet network. (An SNTP server is required separately.)
• An FTP server is built in, so files can be used to transfer PLC data between network PLCs and workstations or personal computers with an FTP client.
• Email can be used to send commands to the PLCs, or triggers can be set so that the PLCs will send PLC data or Ethernet Unit status to a host computer.
• The standard UDP/IP and TCP/IP protocols are supported to enable communications with a wide range of devices, workstations, personal computers, and Ethernet modules from other manufacturers.
• The SMTP/POP3/SNTP servers enable the use of host names instead of IP addresses. (A DNS server is required separately.)
Ethernet Units Specifications
| Item | Specifications |
| Model number | CJ1W-ETN21 |
| Type | 100Base-TX (Can be used as 10Base-T) |
| Applicable PLCs | CJ-series PLCs |
| Unit classification | CJ-series CPU Bus Unit |
| Mounting location | CPU Rack or Expansion Rack |
| Number of Units that can be mounted | 4 max. (including Expansion Racks) |
Transfer
specifications | Media access method | CSMA/CD |
| Modulation method | Baseband |
| Transmission paths | Star form |
| Baud rate | 100 Mbit/s (100Base-TX) | 10 Mbit/s (10Base-TX) |
| Transmission media | Unshielded twisted-pair (UDP) cable
Categories: 5, 5e
Shielded twisted-pair (STP) cable
Categories: 100 Ω at 5, 5e | Unshielded twisted-pair (UDP) cable
Categories: 3, 4, 5, 5e
Shielded twisted-pair (STP) cable
Categories: 100 Ω at 3, 4, 5, 5e |
| Transmission distance | 100 m (distance between hub and node) |
| Number of cascade connections | No restrictions if switching hubs are used. |
| Current consumption (Unit) | 370 mA max. at 5 V DC |
| Weight | 100 g max. |
| Dimensions | 31 × 90 × 65 mm (W × H × D) |
| Other general specifications | Other specifications conform to the general specifications of the CJ-series. |
