6.3 Setting Items for PLC Link
6.3.1 Unit Number Setting
● In a PLC link that connects multiple PLCs on the same transmission line, a unit number must
be assigned to each PLC for identification.
● A unit number is a unique number used to identify PLCs on a network. The same number
must not be used for more than one PLC on the same network.
PLC
PLC PLC PLC PLC
1
RS-485
2 3 4 16
Unit No.
Max. 16 units
6.3.2 Setting of the Largest Unit Number
● Specify the largest PLC unit number used for PLCs connected to the PLC link.
● The smaller unit numbers are, the relatively shorter transmission time is required.
● Unit numbers should be set sequentially and consecutively, starting from 1, with no
breaks between them. If there is a missing unit number, the transmission time will be
longer.
● Specify the same value as the largest PLC unit number for all units connected in a PLC
link.
6.3.3 Memory Block No. of Link Relays and Link Registers to be Used
● The memory areas of link relays and link registers are divided for PLC link 0 and for PLC link
1. Either area can be selected, and max. 1024 points (64 words) can be used for link relays,
and max. 128 words can be used for link registers.
● Specify “0” for using memory blocks in the first half, and “1” for using memory blocks in the
latter half.
6.3 Setting Items for PLC Link
6-8 WUME-FP7COM-07
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