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5-1
Section
Outline of Host Link/NT Link Operation
191
When connected to CVM1/CV series CPU units, however, if the PC is set to
asynchronous operation, it may not be possible to check for the rising edge.
Reference
- Make the allocations so that there is no duplication between the PT status con-
trol area and the PT status notify area.
- When using the NT link (1:N), allocate a PT status control area for each of the
connected PTs.
5-1-4 Switching the Screen Display
(by Using the PT Status Control Area)
The following describes the procedure used to switch the NT620S/620C screen
display by controlling from the PC by the PT status control area.
The displayed screen can also be switched by other methods: by registering a
screen number for a touch switch or bit memory table and then pressing the
touch switch, or by changing the status of the allocated bit of a bit memory table,
during operation. For details on these methods, see “Stand Alone Functions”
(page 154) or the next section, “Switching the Screen Display (by Using the Allo-
cated Bit of a Bit Memory Table)”.
To switch the NT620S/620C screen display by controlling from the PC, write a
screen number at the “screen switch setting” in the PT status control area.
NT620S/620C
PC
Designated screen
PT status control area
Screen switch setting
PT status control setting
Screen number
Copy memory table
setting
[Screen switch setting in the PT status control area]
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit
PT status notify bits
Word n
Screen switch setting
Screen number: 0000 (screen clear, no-display)
0001 to 02000
Screen number (4-digit BCD)
Reference
The screens numbered 1997 to 1999 are earmarked for special functions, as
shown below. The display history can be checked by calling them during opera-
tion.
1997 :
Display history (order of occurrence) screen
1998 :
Display history (order of frequency) screen
1999 :
Screen when connected to the host
Summary of Contents for NT620C
Page 1: ...Cat No V033 E1 5 Programmable Terminals NT620S 620C OPERATION MANUAL...
Page 2: ...NT620S 620C Programmable Terminals Operation Manual Revised April 2001...
Page 3: ...iv...
Page 5: ...vi...
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