BECKHOFF BC8000 - Manual (Page 23)

RS485 – Controller BC8000
BC8000 23
Bus matching resistor
RxD/TxD (3)
TxD/RxD (8)
GND (5)
5 V (6)
RS485
transmission
Network topology Line-topology, active bus matching resistor on both
ends
Fundamental
characteristics of physical
data transmission per
RS485
Medium Shielded twisted-conductor cable
Max. cable length 1200 m
Transmission rate 19.2 kbaud
(selectable only with address 99 active – see table in
appendix)
Plug connector 9-pin D-sub plug
The User Programming Interface
TwinCAT BC The TwinCAT BC programming system for the bus terminal controller uses
the programming system of TwinCAT PLC. Programs can be loaded into a
bus terminal controller via a programming cable and analyzed there.
The programming system for Beckhoff bus terminal controllers is
manufacturer independent according to IEC1131-3. The PLC programs
can be written in 5 different programming languages (IL, FBD, LD, SFC,
ST). In addition, TwinCAT BC offers extensive debug functionalities
(breakpoint, single step, monitoring,...), which facilitate commissioning.
Remanent Data
Data that is to be retained after the coupler has been switched off are
referred to as remanent data (or retain variables). In the BC8x00 this
includes all the variables in the flags area.
Example: VarM1 AT %MB0: INT;
The default setting 64 bytes to be saved, i.e. from %MB0 to %MB63.
The KS2000 software allows this region to be increased to a maximum of
512 bytes (Table 1, Register 15).
Persistent Data
1
The Persistent Data remain intact, even after a new program download and
1
From Firmware B2