[Uncategorized] MODBUS BUS COUPLER
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BK7300, BK7350 | Modbus Bus Couplers
The BK73x0 Bus Couplers connect the Modbus bus system to the modular, extendable electronic terminal blocks. One unit consists of one Bus Coupler, any number from 1 to 64 terminals and one end terminal. The “Compact” BK7350 Bus Coupler is a cost-optimised version with compact housing. With the K-bus extension, up to 255 Bus Terminals can be connected.
The Bus Couplers recognise the terminals to which they are connected, and perform the assignment of the inputs and outputs to the words of the process image automatically. The first input/output signal will be added to the first bit of a word (LSB), beginning from the left. The Bus Coupler adds further signals to the word. A clear separation is maintained between inputs and outputs. If the number of inputs or outputs is greater than 16 bits, the Bus Coupler automatically begins a new word.
Modbus has a line topology based on the RS485 interface. The Modbus protocol is published. The BK73x0 support the RTU and ASCII protocols. The baud rate is variable and can be set directly via the rotary selection switch on Bus Coupler, i.e. without configuration software.
The Modbus Bus Couplers support various Modbus functions that enable direct access to digital and analog signals. The BK7300 and BK7350 also support the diagnostic Modbus function that enables faults to be detected and counted. In addition, the Bus Couplers diagnose faulty or erroneous telegrams and respond to the controller with an error. BK7300 and BK7350 enable broadcast access, which means that several Bus Couplers can be addressed simultaneously with a single telegram.
System data | Modbus | BK7300, BK7350 | |
---|---|---|
Number of I/O stations | 99 | |
Number of I/O points | depending on controller | |
Data transfer medium | screened, twisted copper cable 2 x 0.25 mm² (RS485) | |
Max. cable length | 1,200 m | |
Data transfer rates | 150 baud…38,400 baud | |
I/O communication types | read/write access, optionally bit oriented or word oriented | |
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