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* CPU internal user device for PLC
Input: X
Bit device Output: Y
Internal relay: M
Data register: D
Link register: W
5.2 Address assignment of master PLC
Number of maximum link points per one system is respectively 2048 points for remote input and output (RX,
RY) and 256 points for remote register (RWw, RWr), and a buffer memory for this size is available.
Address assignment for the master station buffer memory is as shown in a diagram on the next page.
The remote input RX is assigned to 0E0
H
-15F
H
addresses, the remote output RY is to 160
H
-1DF
H
addresses,
the remote register RWw is to 1E0
H
-2DF
H
addresses, and the remote register RWr is assigned to 2E0
H
-3DF
H
addresses.
Number of links per one remote station is respectively 32 points (2 words) for remote input and output (RX,
RY), and 4 points (4 words) for remote register (RWw, RWr), then links of a maximum 64 stations are available
for one system.
Station No. of 1 to 64 can be set to a remote station, however, the number of exclusive stations vary with the
remote station, so it is necessary to exercise sufficient caution to set the station No.
Data communication between the internal device of the CPU and the master station buffer memory is
sometimes performed by sequence command such as FROM command and TO command, and is, in some
case, automatically performed by setting the parameters in advance (automatic refresh).
Word device
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