Mitsubishi Electric QJ81DL96 User Manual page 158

4
SETTINGS AND PROCEDURES UP TO OPERATION
4
- 13 4.4 Wiring
4.4.2 Wiring precautions
POINT
During high speed data communication (100 Mbps) via 100BASE-TX connection,
communication errors may occur due to the effect of high frequency noise
generated from the equipment other than programmable controller, depending on
the installation environment.
Take the following countermeasures on the high speed data logger module side to
eliminate the effect of high frequency noise when constructing the network
system.
(1) Wiring
• Do not install the twisted pair cables together with the main circuit or
power lines, or bring them close to each other.
• Make sure to place the twisted pair cable in a duct.
(2) Cable
• In the environment where the cable is susceptible to noise, use the
shielded twisted pair cable (STP cable).
(3) 10 Mbps communication
• Connect the 10 Mbps-compatible equipment with the high speed data
logger module and transmit the data to the equipment at a transmission
speed of 10 Mbps.