6.6.2 Setting of Unit Numbers
- By default, the unit number for the communication port is set to 1 in the system registers.
- In a PC(PLC) link that connects multiple PLCs on the same transmission line, the unit number must be
set in order to identify the different PLCs. The unit number is specified either by using the SYS1
instruction or the system register.
Precautions on the unit number settings
- Unit numbers are the numbers to identify the different PLCs on the same network. The same number
must not be used for more than one PLC on the same network.
- 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.
- If fewer than 16 units are linked, the transmission time can be shortened by setting the largest unit
number in system register no. 47.
- The prioriry order for unit number settings is as follows;
1. SYS1 insturction
2. System registers
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