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Appendix
Address
0x0000
0x00FF
0x0800
0x08FF
0x1000-
0x1006
0x100A
0x100B
Only Read
0x100C
0x1010
0x1011
0x1012
0x1013
0x1020
0x110A
Read/Write
0x110B
0x1120
0x400
0x40FF
Bus Coupler status
15
FB
0x100C
FB:
Fieldbus error, watchdog time elapsed
KB:
Terminal Bus error
CNF:
BK configuration window
2 byte PLC interface/
2 byte diagnostic interface
3
From Firmware B4
BC7300
MODBUS Interface
Description
Process data interface
Inputs (%QBx)
Process data interface
Outputs (%IBx)
Bus Coupler identification
2 byte PLC interface
Terminal diagnostics
Bus Coupler status
Process image length in bits
Process image length in bits
Process image length in bits
Process image length in bits
Watchdog
2 byte PLC interface
Terminal diagnostics
Watchdog
3
Flag range
%MB0 - %MB511
14
13
12
11
10
Registers in the complex terminals and Bus Coupler registers can both be
read or written using the 2 byte PLC interface. The complex terminal
registers are described in the associated terminal documentation. The Bus
Coupler registers can be used, for example, to read terminal bus
diagnostics data, the terminal composition or the cycle times, and the
programmed configuration can be written. It is also possible for a manual
terminal bus reset to be carried out. The 2-byte PLC interface requires two
bytes each of output and input data. They are handled using a special
protocol. A description of the 2 byte PLC interface, the registers available
in the Bus Couplers and of function blocks for various PLCs that implement
the 2 byte PLC interface can be supplied on request.
The terminals' error messages can be sent over the 2-byte diagnostic
interface. Terminal bus diagnostics must however be activated for this
purpose. The 2-byte diagnostic interface occupies two bytes each of output
and input data. They are handled using a special protocol. A description of
the 2 byte-diagnostic interface can be supplied on request.
Analog outputs
Analog inputs
Digital outputs
Digital inputs
Current time in [ms]
Pre-defined time in [ms]
9
8
7
6
5
Appendix
1000
1000
4
3
2
1
0
CNF KB
41
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