Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 38)

Configuring the Scanner through LIST
Chapter 2
2-12
3 - DH/DH+ Timeouts
Select the DH/DH+ Timeouts option to set these timeout values in seconds:
outgoing message
LIST channel
remote program
Outgoing Message
This timeout is the maximum amount of time that the scanner waits for
another station to reply to one of the messages. The valid entries are 0 to
999.9. In LIST, you can enter timeout values as whole numbers or in
tenths of seconds.
For example:
If you enter a timeout value of: The scanner sets the timeout period for:
100 100.0 seconds
50.2 50.2 seconds
Important: If you enter 0, the processor disables the timeout parameter.
The timeout period applies to each individual transmission. Some
messages consist of several packets of data because of their size. Each
message packet requires a separate transmission. Therefore, the timeout
restarts for each packet.
LIST Channel
This timeout detects a lack of activity by a station on the link still having
an allocated LIST resource. Set this value high enough to prevent a
timeout while running LIST but not so high that a station on the link keeps
the LIST resource allocated unnecessarily.
Once this time expires, the next list selection you enter displays the initial
list menu. You can then continue through your selections.
Important: This timeout takes affect anywhere from one to two times the
value you enter through LIST.
Remote Program
This timeout detects a lack of activity by a previously connected
programming station. Should a connected programming station be
abruptly disconnected from the link, this timeout would make sure that the
edit resource and histogram resources are returned to the scanner.
Important: This timeout takes affect anywhere from one to two times the
value you enter through LIST.