BC8050 | RS485 Bus Terminal Controller
fieldbus,
power LEDs
supply
power contacts
programming interface
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
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| PLC data | RS485 | BC8050 |
|---|---|
| Programming | TwinCAT (via programming interface or fieldbus) |
| Program memory | 48 kbytes |
| Data memory | 32 kbytes |
| Remanent data | 2 kbytes |
| Runtime system | 1 PLC task |
| PLC cycle time | approx. 3 ms for 1,000 instructions (without I/O cycle, K-bus) |
| Programming languages | IEC 61131-3 (IL, LD, FBD, SFC, ST) |
| Online change | yes |
| Technical data | BC8050 |
|---|---|
| Number of Bus Terminals | 64 (255 with K-bus extension) |
| Max. number of bytes fieldbus | 512 byte input and 512 byte output |
| Max. number of bytes process image | 512 byte input and 512 byte output |
| Digital peripheral signals | 1,020 inputs/outputs |
| Analog peripheral signals | 128 inputs/outputs |
| Protocol | KS8000 protocol (open, serial protocol) – Modbus RTU/Modbus ASCII can be selected via address switch. |
| Data transfer rates | 1.2 kbaud…38.4 kbaud |
| Bus interface | D-sub 9-pin, RS485 |
| Power supply | 24 V DC (-15 %/+20 %) |
| Input current | 320 mA max. |
| Starting current | 2.5 x continuous current |
| Current supply K-bus | 1750 mA |
| Power contacts | max. 24 V DC/max. 10 A |
| Electrical isolation | 500 V (power contact/supply voltage) |
| Weight | approx. 100 g |
| Operating/storage temperature | -25…+60 °C/-40…+85 °C |
| Relative humidity | 95 %, no condensation |
| Vibration/shock resistance | conforms to EN 60068-2-6/EN 60068-2-27 |
| EMC immunity/emission | conforms to EN 61000-6-2/EN 61000-6-4 |
| Protect. rating/installation pos. | IP20/variable |
| Approvals/markings | CE, UL, ATEX, IECEx |
| Ex marking | ATEX: II 3 G Ex nA IIC T4 Gc IECEx: Ex ec IIC T4 Gc |
| Housing data | BKxx50, BCxx50 |
|---|---|
| Design form | compact terminal housing with signal LEDs |
| Material | polycarbonate |
| Dimensions (W x H x D) | 44 mm x 100 mm x 68 mm |
| Installation | on 35 mm DIN rail, conforming to EN 60715 with lock |
| Side by side mounting by means of | double slot and key connection |
| Marking | labeling of the BZxxx series |
| Wiring | solid conductor (s), flexible conductor (st) and ferrule (f): spring actuation by screwdriver |
| Connection cross-section | s*: 0.08…2.5 mm², st*: 0.08…2.5 mm², f*: 0.14…1.5 mm² |
| Stripping length | 8…9 mm |
| Current load power contacts | Imax: 10 A |
*s: solid wire; st: stranded wire; f: with ferrule
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