Omron NS12 Quick Start Manual page 22

OMRON
Page 22
4. Operation log size can be set in the [History] tab. When the "Ring
Buffer" is used, oldest marking in the history log will be replaced
with the newest one. If "Ring Buffer" is not used, the logging will
stop when the log memory is full.
5. The [Comm-All] tab has the most significant settings according to
all communications. Other communication tabs are disabled if
specific setting is [None] or [Disable].
Select only the communications that are needed to host
communication. Needless communication settings will cause
an error in the NS-terminal.
Serial port A and B can communicate with PLC or Bar-Code
Reader. If communication is not needed, choose "None".
For example; when "Serial Port A" setting is [PLC], the specific
settings about serial port A are in the [Serial PortA] tab.
You can set all communications at the same time but then there is
no guarantee the quality of the connection. The communication
speed may be slower or errors may occur because all the
communication combinations are not fully tested.
For a first time use, you can leave all the Comm-settings to
[None] or [Disable]. The following programming example will
use only the internal memory, no PLC-communications. In
case you are only interested in the programming example
you may skip the following steps 6-10 in this section!
NS Series Quick Start Manual