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Areas for Control/Notification
Section 7-2
Allocated Words of the PT Status Notify Area
The PT status notify area (NT31/NT31C → host) can be allocated to the following
host (PC) areas.
Symbol C Series PCs Allocation CVM1/CV Series PCs Allocation CS1 Series PCs Allocation
DM Data memory 3 Data memory 3 Data memory 3
CH I/O relay 3 I/O relay 3 I/O relay 3
TIM Timer present value Timer present value Timer present value
CNT Counter present value Counter present value Counter present value
HR Holding relay 3 – – Holding relay
AR Auxiliary relay 3 Special auxiliary relay Special auxiliary relay
LR Link relay 3 – – – –
EM EM Current Bank
*1
*2
3 EM Current Bank
*2
n EM Current Bank
*2
3
3: OK : NG n: Host link not available
*1 : EM (Extended data memory) of C series is available only with C200HX/HG/HE (–Z).
*2 : Only current bank can be allocated for EM (Extended data memory).
Since the special auxiliary relays of the CVM1/CV series PCs are all allocated to
system functions, they cannot be used for purposes other than system use.
The range of each memory area differs according to the PC type. Refer to AP-
PENDIX L “PC Memory Map”, page 684.
Note S Set so that there is no overlap between the PT status control area and PT status
notify area.
S When using the NT link (1:N) method, allocate a PT status control area and PT
status notify area — making sure that they do not overlap — for each connected
NT31/NT31C.
Functions of the PT Status Notify Area
S Content update memory table number
When the contents of a numeral/character string memory table have been
changed by operation at the NT31/NT31C, the number of the memory table sub-
ject to the change is written to the “content update memory table number” word
as a 4-digit BCD or hexadecimal value. Whether the value is expressed in BCD
or hexadecimal is determined by the setting for numeral storage type in the PT
configuration settings made with the Support Tool.
12345678
5678
1234
789
456
123
0.
12345678
12345678 →
Numeral memory table 1
Allocated word (numeral memory table 1)
First
First + 1
Table number
Numeral setting
strobe flag
PT status notify area
Content update memory table
PT status
PCNT31/NT31C
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