Slave Stations (Slave Unit, I/O Terminal, I/O Terminal Board, Etc) - Panasonic MEWNET-F Technical Manual

1.2.2 Slave Stations (Slave Unit, I/O Terminal, I/O Terminal Board, etc)

The I/O that is controlled by the master station (CPU unit and master unit) on the remote I/O system
[MEWNET-F] is called slave stations. A maximum of 32 stations can be connected per master unit, and
up to 4096 points of I/O can be controlled.
- Slave stations can be mixed. The FP3 system or exlusive I/O terminals are also controlled as slave
stations. There is not restriction on the order of connection and the composition ratio.
- Staton numbers are set to each slave station. I/O numbers are allocated in the order of station
numbers. It is not neccesary to set station numbers according to the order from the unit closer to the
master unit. Also, it is no problem there are blanks.
Overview of slave stations
-FP2/FP3 system (Slave station system)
This is the system with a slave unit installed in the CPU slot of the master backplane instead of a CPU
unit as "Slave station control part" shown above. (Note1, Note3) An advanced unit (Note2) can be used
as "I/O part" as well as I/O unit.
"Shared memory access function" is also available.
Note1) I/O can be added by connecting expansion backplane as well as the standard system. Up to 3
backplanes including a master backplane can be added.
Each length of expansion cables should not be longer than 1.2 m each for FP3, and 2.6 m
totally for FP2.
Note2) There are some advanced units which cannot be used for the slave station system.
Reference: <1.2.3 Advanced Units Not to be Used for Slave Station System of "MEWNET-F">
Note3) The system cannot be controlled only by the slave unit without a master station.
-FP I/O Terminal Unit
As the [MEWNET-F] FP terminals, there are an I/O terminal board that the input and output are
combined and an I/O terminal unit (Note) that the input and output are separate. The "Slave station
control part" and "I/O part" shown in the above figure is contained in a single unit.
Note) There are an input unit and output unit for the I/O terminal unit. Also, number of controllable points
can be incrased or the input and output can be combined by connecting expansion units.
-FP0/FP1/FP-M & I/O Link Unit
The connection to the [MEWNET-F] network can be established by connecting the I/O link unit to
FP0/FP1/FP-M The I/O of FP0/FP1/FP-M cannot be directly controlled by the master station, however,
the I/O link area input of FP0/FP1/FP-M can be controlled with FP3 programs, or the remote I/O area
input of FP3 can be controlled with FP0/FP1/FP-M programs.
Reference: <Chapter 11, Chpater 12 (Appendix) I/O Link>
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