Twisted Pair Cable - Mitsubishi Electric Q12DCCPU-V User Manual

2
SYSTEM CONFIGURATION

(2) Twisted pair cable

2
- 26 2.4 Applicable Devices
Use the twisted pair cables that meet IEEE802.3 10BASE-T/100BASE-TX standards.
(a) At 100Mbps
Use either of the following cables.
• Unshielded twisted pair (UTP) cable
Straight cable: Category 5 or higher
Crossing cable: Category 5 or 5e
• Shielded twisted pair (STP) cable
Straight cable: Category 5 or higher
Crossing cable: Category 5 or 5e
(b) At 10Mbps
Use either of the following cables.
• Unshielded twisted pair (UTP) cable
Straight cable: Category 3 or higher
Crossing cable: Category 3 to 5e
• Shielded twisted pair (STP) cable
Straight cable: Category 3 or higher
Crossing cable: Category 3 or 5e
POINT
In the high-speed communication (100Mbps) by 100BASE-TX connection, a
communication error may occur due to high frequency noise generated from a
device other than the C Controller module, depending on the installation
environment.
When configuring a network system, take the following measures on the C
Controller module side to eliminate the influence of high frequency noise.
1. Wiring
• Do not install the twisted pair cables together with the main circuit lines or
power cables.
• Place the twisted pair cables in a duct.
2. Cable
• In an environment where the system is susceptible to noise, use shielded
twisted pair (STP) cables.
3. Retry processing
• In an environment where the system is susceptible to noise, include the
retry processing in the user program.
4. 10Mbps communication
• Replace the devices connected to the C Controller module with 10Mbps
devices for communication at a speed of 10Mbps.