21
Communication with the Host
Section 1-3
S Alarm history (bit memory table) (page 406)
Allocation destination: Bit
PC
1015012
NT31/NT31C
Water temp. high
Alarm history
Character string memory table 134
Water temp. high
Bit memory table 52
Bit 015012
Character string memory table 134
Alarm history record data
The PC bit allocated to bit memory table for which the history property has been
set is continually monitored: when the bit comes ON (1),the time and thenumber
of times, and the contents of the character stringmemory table registered for the
bit memory table, are recorded in the alarm history record data.
This record data can be displayed as the alarm history.
Functions of the PT Status Control Area (PC to NT31/NT31C)
The “PT status control area” is used to control the NT31/NT31C status. When
data is written to this area in the PC, the NT31/NT31C reads the contents and op-
erates according to the contents.
[Example of PT status control area application]
When data is written to the PT status control area, the NT31/NT31C operates as
shown below (page 265).
PC
0003
0050
1007
A000
NT31/NT31C
Screen 3 display
Continuous
buzzer
sound
Numeral memory table 50
Copy
Numeral memory table 7
PT status control area
PT status control bits
Screen switch setting
Memory table
Copy setting
System reserve
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