from the Forum department...
communication error for omron cpu
Communications systems and equipment. topic
Posted by k_g on 8 February, 2012 - 6:52 pm
Both communications ports of CPU51 (omron cqm1h) are used in the system. peripheral port is connected to programmable terminal (omron nt30) and rs232 port is connected to one more cpu51 (omron cqm1h).
At present the red ERR/ALM indicator of first cpu lights. I could use CX programmer 2.1 but I don't know how to do it (where to connect and what cable). Is it possible to delete this fatal error from cpu using cx programmer or to know what kind of error I have at least?

Thanks for advance.

Posted by Marius on 9 February, 2012 - 1:04 am
> Is it possible to delete this fatal error from cpu using cx programmer or to
> know what kind of error I have at least?

may be a hardware configuration error. Look in the CX_programmer at IO Table and Unit setup, and then click on the [0000]Main Rack

Posted by Mark Levin on 16 February, 2012 - 2:42 am

it can be a problem of hardware configuration. please read user manual carefully

Posted by Steve Chilton on 24 February, 2012 - 6:55 pm
There are several options available.
The NT30 might be talking to the PLC using the same protocol and the programming protocol (sysmac Host link) [the other option is NT-Link].

The other port is probably set in 'PC-Link' mode to allow easy communication between PLC's.

Best way to check for the NT30 is to see what protocol it is set to (press any two corner touch switches then go into one of the menu's [cant remember right now].

If NT is set to NT-Link, then you will need to switch on one of the DIP switches on the front of the CPU to change the port to Host Link (default 9k6, 7data even parity, 2 stop) then you just need the correct cable to connect to the PC.

Hope this is a start - please email me if you want detailed help.


Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy. Please read those terms and conditions carefully. Subject to the rights expressly reserved to others under Legal Notices, the content of this site and the compilation thereof is © 1999-2014 Nerds in Control, LLC. All rights reserved.

Users of this site are benefiting from open source technologies, including PHP, MySQL and Apache. Be happy.

Heller's Law:
The first myth of management is that it exists.

Johnson's Corollary:
Nobody really knows what is going on anywhere within the
Advertise here
our advertisers
Help keep our servers running...
Patronize our advertisers!
Visit our Post Archive