Modbus interface
Address | Description | |||
|---|---|---|---|---|
0x0000 | Process data interfaces | |||
0x0800 | Process data interfaces | |||
0x1000 | Read only | Bus Coupler Fieldbus Box ID | ||
0x100A | 2 bytes PLC interface | |||
0x100B | Bus terminal diagnosis | |||
0x100C | Bus Coupler status | |||
0x1010 | Process image length in bits, analog outputs (without PLC variables) | |||
0x1011 | Process image length in bits, analog inputs (without PLC variables) | |||
0x1012 | Process image length in bits, digital outputs | |||
0x1013 | Process image length in bits, digital inputs | |||
0x1020 | Watchdog, current time in [ms] | |||
0x110A | Read/Write | 2 bytes PLC interface | ||
0x110B | Bus terminal diagnosis | |||
0x1120 | Watchdog, pre-defined time in [ms] (Default value: 1000) | |||
0x1121 | Watchdog reset register | |||
0x1122 | Type of watchdog | 1bin | Telegram watchdog (default) | |
0bin | Write telegram watchdog | |||
0x4000 | Flags area (%MB..)* | |||
* only for Bus Terminal Controllers (BC7300, BC8x50, IL230x-C730)
Watchdog
The watchdog is active under the factory settings. After the first write telegram the watchdog timer is initiated, and is triggered each time a telegram is received from this device. A second approach, which represents a more sensitive condition for the watchdog, is for the watchdog only to be re-triggered after each write telegram. To do this, write a zero into register 0x1122 (default value "1").
The watchdog can be deactivated by writing a zero to offset 0x1120. The watchdog register can only be written if the watchdog is not active. The data in this register is retained.
Watchdog register
If the watchdog timer on your slave has elapsed it can be reset by writing twice to register 0x1121. The following must be written to the register: 0xBECF 0xAFFE. This can be done either with function 6 or with function 16.
Bus Coupler status
|
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
FB | - | - | - | - | - | - | - | - | - | - | - | - | - | CNF | KB |
FB: Fieldbus error, watchdog expired
KB: Bus Terminal error/IP-Link error
CNF: Bus Coupler configuration error
2 byte PLC interface*
Registers in the complex terminals and Bus Terminal Controller registers can be both read and 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 K-bus reset to be carried out. The 2-byte PLC interface requires two bytes each of input and output 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 PLC systems that support the 2 byte PLC interface can be supplied on request.
* not implemented on the BC8150
2 byte diagnostic interface
The terminals' error messages can be sent over the 2-byte diagnostic interface. K-bus diagnostics must however be activated for this purpose. The 2-byte diagnostic interface occupies two bytes each of input and output data. A special protocol is processed via these two bytes. A description of the 2 byte-diagnostic interface can be supplied on request.