NAiS FP2 - Communication Mode; PC(PLC) Link Mode

4-3
4.1 Communication M ode
The following three types of communication function are available with FP2 Multi Communication Unit
(MCU).
4.1.1
PC(PLC) Link Mode
• MCU supports the PC(PLC) link of MEWNET-W0 mode.
• In a PLC link, data is shared with all PLCs connected via MEWNET using dedicated internal relays
called link relays (L) and data registers called link registers (LD).
• If the link relay contact for one PLC goes on, the same link relay also goes on in each of the other
PLCs connected to the network. Likewise, if the contents of a link register are rewritten in one PLC, the
change is made in the same link register of each of the other PLCs connected to the network.
• The status of the link relays and link registers in any one PLC is fed back to all of the other PLCs
connected to the network, so control of data that needs to be consistent throughout the network, such
as target production values and type codes, can easily be implemented to coordinate the data, and the
data of all units are updated at the same time.
- Applicable communication block
RS232C FP2-CB232 (Product No.: AFP2803)
RS485 FP2-CB485 (Product No.: AFP2805)
Note) The number of units for the PC(PLC) link with RS232C is up to 2 units.
Note:
• Different hardwares are used for MEWNET-W0 and MEWNET-W/MEWNET-W2. They cannot be
mixed in the same network.
• Used link relays (L) and link registers (LD) are shared areas with MEWNET-W. Therefore, up to 2 units
of MEWNET-W0 and MEWNET-W specified in the PLC link mode can be used for one CPU system.