Relays, Memory Areas and Constants
1-50
1.3.5 Link Data Registers (LD) for FPΣ/FP−X/FP0R
Function of link data registers (LD)
Link data registers are data memories for “PC links”, which are shared between multiple
programmable controllers which are connected through the same network link.
When data is written to a link data register of one PLC, the contents are stored in the
link data registers that have the same numbers, in other PLCs connected through the
network.
LDn
Send
LDn
Receive
MEWNET-W0
Communication
Cassette
When link data registers are used, data can be exchanged between PLCs simply by
writing the data, as shown here.
Available range of link data registers
The available range of link data registers varies depending on the type of network and
the combination of units. The available range and number of points must be specified
separately for each network
For MEWNET−W0
A maximum of 128 words can be used with one control unit. The available range is from
LD0 to LD127
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