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8-1SectionConnections
115
3. The Programming Console functions of the PT (Expansion Mode) cannot be
used when connected to Serial Communications Board ports. They can be
used only by connecting to the peripheral port or RS-232C port on the CPU
Unit. This is true in both 1:1 and 1:N mode.
4. When using 1:N-mode NT Links, set a unique unit number for each PT con-
nected to the same PC. If the same unit number is set for more than one PT,
malfunctions will occur.
5. The number of PTs that can be connected to one port in 1:N mode is limited
by the CPU Unit’s cycle time when a Serial Communications Board is used,
as shown in the following diagrams. Although some communications will be
possible even if these restrictions are exceeded, communications errors will
occur depending on the PT operating conditions and communications load.
Always abide by these restrictions when using 1:N mode.
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