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Overview of 1:N NT Links Section 8-1
5. NT Link serial communications are unique and are not compatible with oth-
er serial communications modes.
6. The NT20S, NT600S, NT30, NT30C, NT620, NT620C, and NT625C can-
not be used if the cycle time of the CPU Unit is 800 ms or longer (even if
only one of these PTs is used in a 1:N NT Link).
7. With some PTs, timeout settings can be changed to eliminate some of the
communications errors. Refer to the operation manual for the PT for de-
tails.
8. If more PTs are required by the system than allowed by the above restric-
tions, connect the PTs in smaller groups to different ports and increase the
number ports by adding Serial Communications Units or a Serial Commu-
nications Board (if one is not already being used).
Priority
Registered
PTs per port
CPU Unit's cycle time (ms)
Priority Not
Registered
PTs per port
CPU Unit's cycle time (ms)
Example for NT31/NT631(C) PTs
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