Formation Of Multi-Unit System; Connection Of Multiple Fbs-Plc (Cpu Link) - FATEK FBs Series User Manual

The Single-Unit system means a system built only by a single FBs-PLC and its expansion unit/modules and
communication boards/modules. Such system have a limited capability (refer), beyond that capability can incorporate
CPU communication via LINK function for expansions (please refer to the next paragraph). The figure below shows the
block diagram of the Single-Unit system of FBs-PLC, where, besides the available main units , the available
communication peripherals resources and I/O expansion resources are depict on the left and the right respectively.
For the I/O of FB -PLC, it can achieve a maximum of 256 point digital input (DI), 256 point digital output (DO), 64 word
S
numeric input (NI), and 64 word numeric output (NO). Combined with various special interface modules, it can directly
connect with devices such as Thermocouple, RTD, 7-segment LED display, and the Thumbwheel switch, which are
shown on the right in the above figure.
Regarding communication resources, the FBs-PLC hardware can accommodate up to 5 communication ports (with a
maximum speed of 921.6Kbps). In addition to providing the standard FATEK communication protocol, it also supports the
Modbus master/slave protocol or any user-defined protocol. This functionality easily renders the connections with
intelligent peripherals such as electronic scale, bar code reader, and various meters and gauges.
2.2

Formation of Multi-Unit System

By connections through communication ports and specific communication drivers, multiple Single-Unit PLC systems
can be integrated to achieve resources sharing among multiple PLC or PLCs and its host computer. It is described as
follows:
2.2.1

Connection of Multiple FBs-PLC (CPU Link)

FB
FBs-PLC
Main Unit
週邊
Peripherals
As shown in the figure, through the usage of high-speed RS-485 network, can easily establish the connections of 2~254
main units (each PLC with its own station number). All need to do is to write and execute CPU Link commands in one of
the main units, which makes it the Master of the CPU Link network. No other command is necessary for other Slave units.
The Master CPU will automatically collect the information or data in the specific areas of all units (including the Master)
and put it into the Common Data areas(CDM) of all units. Thus all the units connected by network can share the data for
each other and turning the finite Single-Unit system with limited I/O into a huge system.
RS-485
FB -PLC
-PLC
S
S
FBs-PLC
主機
主機
Main Unit
週邊
I/O
Peripherals
網路
RS-485 Network
I/O
H2-2
FB -PLC
S
FBs-PLC
主機
Main Unit
週邊
I/O
Peripherals