Omron NT20, Руководство пользователя

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168
Overview of Direct Connection Operations Section 5-1
3. The NT20 changes the display status according to the bits and words ob-
tained from the PLC.
NT20 Operation Example
Controlling the NT20 Status by Using Allocated Bits and Words ..... PT Status Control Area (PLC to PT)
The PT status control area (PLC to PT) is provided to control the NT20 status
from the PLC. When data is written to this area in the PLC, the NT20 will read
the data and operates according to the data. The PT status control area is
configured as four consecutive words as shown below.
The first word (word n) of the PT status control area must be set with the Sup-
port Tool.
• Screen Switch Settings (Refer to page 172.)
Specify the screen number to switch the screen displayed on the NT20.
• Copy Memory Table Settings (Refer to page 187.)
Specify the memory table entry number to copy the contents of a memory
table internally in the NT20.
Set the copy type to match the type of memory table entry to be copied:
0: Character-string memory table
1: Numeral memory table
• PT Status Control Bits (Refer to page 203.)
These bits are switched ON and OFF to control the NT20 buzzer and back-
light.
Lamp #0
Bit 010012?
Character-string memory table entry 2
First word: DM0100
Number of saved words: 3
TIM003?
DM0100 to DM0102?
Bit 010012
NT20
PLC
("a", "b")
("c", "d")
("e", "f")
Numeral memory table entry 0
First word: TIM003
Number of saved words: 1
Word 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit
PT status control
n
n+1
n+2
n+3
0
Copy type Copy destination memory table entry # (3-digit BCD)
Copy source memory table entry # (3-digit BCD)
PT status control bit
Screen # (4-digit BCD)
0
0
Copy memory
table setting
Screen switch
setting