patelbaroda
Guest
P
I have YASKAWA U84 PLC with remote I/O installed around 300 Meters away from Main CPU. The YASKAWA is MODICON 486 or 586 model. Recently we have faced a serious problem of PLC hanging along with lightening in the sky. This happend for last four times in just 20 days period. Other wise the PLC works fine. We have dual redundent CPU with switching module, Remote I/O driver, Communication module and ASCII module.
YOKOGAWA DCS CENTUM-XL is connected to the PLC through YOKOGAWA Gateways. The PLC has 1663 installed I/Os in six remote channels.
The communication between CPU and remote rack is through MODICON quad shield coaxial cable. The cables are redundent.
I request all users to share their knowledge and experience with me, if possible. my email ID is [email protected]
The PLC earth pit is seperate from DCS , PANEL earthpit. The coax cable is laid on the top of the cable rack and in the GI pipe of schedule 40 and the GI pipe is grounded to power earth. The PLC earth pit resistance is less then 1 ohms and both remote I/O installed at electrical substation and main CPU rack earthpits are connected through a grounding cable. DCS, PANEL and PLC is not showing any earth connection with each other.
Thanks in advance.
Pragnesh Patel
YOKOGAWA DCS CENTUM-XL is connected to the PLC through YOKOGAWA Gateways. The PLC has 1663 installed I/Os in six remote channels.
The communication between CPU and remote rack is through MODICON quad shield coaxial cable. The cables are redundent.
I request all users to share their knowledge and experience with me, if possible. my email ID is [email protected]
The PLC earth pit is seperate from DCS , PANEL earthpit. The coax cable is laid on the top of the cable rack and in the GI pipe of schedule 40 and the GI pipe is grounded to power earth. The PLC earth pit resistance is less then 1 ohms and both remote I/O installed at electrical substation and main CPU rack earthpits are connected through a grounding cable. DCS, PANEL and PLC is not showing any earth connection with each other.
Thanks in advance.
Pragnesh Patel