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BC8050 | RS485 Bus Terminal Controller

Image similar, may contain optional accessories
BC8050 | RS485 Bus Terminal Controller

BC8050 | RS485 Bus Terminal Controller

Status display
fieldbus,
power LEDs
K-bus
Bus Coupler
supply
Input for
power contacts
Power contacts
Serial interface
Address selector
Configuration and
programming interface
Address selector
BC8050 | RS485 Bus Terminal Controller

BC8050 | RS485 Bus Terminal Controller

The BC8050 Compact Bus Terminal Controller with serial RS485 interface extends the Beckhoff small controller series by a cost-optimized version in a compact housing. An open serial protocol – like in the BK8x00 Bus Couplers – and the Modbus RTU/ASCII protocol are implemented. The address and the protocol are selected via the two rotary selection switches.

Controller for stand-alone applications

The Bus Terminal Controller is programmed using the TwinCAT 2 programming system conforms to IEC 61131-3. The PLC programs can be written in five different programming languages (IL, FBD, LD, SFC, ST). In addition, TwinCAT offers extensive debug functionalities (breakpoint, single step, monitoring, …), which facilitate commissioning. It is also possible to perform adjustment and measurement of the cycle time. The inputs and outputs of the connected Bus Terminals are assigned in the PLC.

Data is exchanged with the interface on the Bus Terminal Controller with the aid of a control and status byte, through which a handshake must be executed. A serial communication function block for TwinCAT is available for this purpose.

Product status:

regular delivery (not recommended for new projects)

Product information

PLC dataRS485 | BC8050
ProgrammingTwinCAT (via programming interface or fieldbus)
Program memory48 kbytes
Data memory32 kbytes
Remanent data2 kbytes
Runtime system1 PLC task
PLC cycle timeapprox. 3 ms for 1,000 instructions (without I/O cycle, K-bus)
Programming languagesIEC 61131-3 (IL, LD, FBD, SFC, ST)
Online changeyes
Technical dataBC8050
Number of Bus Terminals64 (255 with K-bus extension)
Max. number of bytes fieldbus512 byte input and 512 byte output
Max. number of bytes process image512 byte input and 512 byte output
Digital peripheral signals1,020 inputs/outputs
Analog peripheral signals128 inputs/outputs
ProtocolKS8000 protocol (open, serial protocol) – Modbus RTU/Modbus ASCII can be selected via address switch.
Data transfer rates1.2 kbaud…38.4 kbaud
Bus interfaceD-sub 9-pin, RS485
Power supply24 V DC (-15%/+20%)
Input current320 mA max.
Starting current2.5 x continuous current
Current supply K-bus1750 mA
Power contactsmax. 24 V DC/max. 10 A
Electrical isolation500 V (power contact/supply voltage)
Weightapprox. 100 g
Operating/storage temperature-25…+60°C/-40…+85°C
Relative humidity95%, no condensation
Vibration/shock resistanceconforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emissionconforms to EN 61000-6-2/EN 61000-6-4
Protect. rating/installation pos.IP20/variable
Approvals/markingsCE, UL, ATEX, IECEx
Ex markingATEX: II 3 G Ex ec IIC T4 Gc
IECEx: Ex ec IIC T4 Gc
Housing dataBKxx50, BCxx50
Design formcompact terminal housing with signal LEDs
Materialpolycarbonate
Dimensions (W x H x D)44 mm x 100 mm x 68 mm
Installationon 35 mm DIN rail, conforming to EN 60715 with lock
Side by side mounting by means ofdouble slot and key connection
Markinglabeling of the BZxxx series
Wiringsolid conductor (s), flexible conductor (st) and ferrule (f): spring actuation by screwdriver
Connection cross-sections*: 0.08…2.5 mm²,
st*: 0.08…2.5 mm²,
f*: 0.14…1.5 mm²
Stripping length8…9 mm
Current load power contactsImax: 10 A

*s: solid wire; st: stranded wire; f: with ferrule

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