6-3
Section
Allocating PT Memory to the Host (Master)
74
Reference 1. The number of words allocated to the memory tables can be set with the
Support Tool.
2. The output area and input area can be allocated up to 32 words of PT
memory each. Refer to 6-3 Allocating PT Memory to the Host (Master) for
details.
6-2-3 Allocation Example
Elements allocated in PT memory:
Element
Allocation
PT status control area
1 (Fixed at 5 words)
PT status notify area
1 (Fixed at 2 words)
Lamps
2
Touch switches (input notification function)
3
Numeral memory tables 0 to 3
4 (1 word each)
Address
PT memory
PT status notify area
Output area
(Host
→
PT)
Lamps
Touch switches
(Lamp bits)
Input area
(PT
→
Host)
Touch switches
(Notification bits)
PT status control area
Lamps and touch switches
Numeral memory table 0
Numeral memory table 1
Touch switches
Numeral memory table 2
Numeral memory table 3
15 14 13 12 11 10 9 8 7 6
5 4 3 2
1 0
Bit
15 14 13 12 11 10 9 8 7 6
5 4 3 2
1 0
Bit
PM0000
to
PM0004
PM0005
PM0006
PM0007
PM0008
to
PM0031
PM0032
to
PM0034
PM0035
PM0036
PM0037
PM0038
to
PM0063
PM0064
to
6-3
Allocating PT Memory to the Host (Master)
In order to use remote I/O communications with the DeviceNet Interface Unit, PT
memory must be allocated in the host’s DeviceNet I/O memory (input and output
areas).
The following two steps are required to allocate PT memory in the host’s input
and output areas.
•
Allocate the DeviceNet Interface Unit’s input and output areas in the PT’s inter-
nal PT memory. (Allocate memory with the PT’s system menu.)
•
Allocate the DeviceNet Interface Unit’s input and output areas in the I/O
memory of the PC (CPU Unit) where the Master is mounted. (Allocate memory
to the Master as a DeviceNet Slave.)
The steps above indirectly allocate part of the PT memory’s area to the host’s
(Master’s) I/O memory as input and output areas.
6-3-1 Allocating Input and Output Areas to PT Memory
PT memory consists of 10,000 words from 0000 to 9999 (PM0000 to PM9999).
The DeviceNet Interface Unit’s input and output areas can be allocated to any
location in PT memory and each area can be up to 32 words long.
