Pro-face GP77R Series Connection Manual page 11

Hitachi Industrial Equipment System - Ethernet
<When CPU Link is used>
Set the [Using CPU Link] check box to ON (checked mark). When using the CPU
Link, Loop No. and Unit No. are included in the address.
Ex.)Using Node Address is 1, Loop No. is 2 and Unit No. is 3
10
1. 2. 3. WM0000
Device Address
CPU Link Unit No. (0 to 63)
CPU Link Loop No. (1 to 2)
Node No. (1 to 32)
When setting up Parts or Tags using GP-PRO/PBIII for Windows, the
PLC's Node Address can be designated when entering the address. When
the Node Address is not specified, the previously entered numbers will
remain.
GP-PRO/PBIII for Windows Device/PLC Connection Manual