The devices were developed specifically for use with Climatix pushbutton configuration as described in document CE1A3975 1).
The bus configuration can alternatively be configured by the local HMI, see section User interface.
Check the following during commissioning:
- Bus configuration (address, baudrate, transmission mode, and optional bus termination). The default address 255 allows mounting and commissioning of multiple actuators at the same time without interfering with each other.
- Actuator parameters (Opening direction, position limits, position adaptation, etc.). The value can be read over the Modbus register.
1) | Documents can be downloaded at http://siemens.com/bt/download. |
Full or partial configuration via bus
The devices can be configured over bus if the pre-commissioning settings allow for a connection between the Modbus master / programming tool and peripheral devices (i.e. non-conflicting addresses and matching baudrate / transmission format).
- Full configuration via bus: A unique Modbus address can connect by the Modbus master/programming tool after startup using the presets for transmission format and baud rate (or auto-baud).
- Partial configuration over the bus: A Modbus address that is not unique must be first set to a unique address, either by using the address input with pushbutton (see Enter address using pushbutton) or by setting the address to 246 by pressing the pushbutton > 5s and < 10s (see Pushbutton operation). The Modbus master/programming tool can then connect after startup using the the presets for transmission format and baud rate (or auto-baud).
The bus and actuator parameters can be set to target values on an existing connection over the bus. For write operations to the bus parameters, "1 = Load" must be written to Reg 768 within 30 seconds; the changes are otherwise discarded.
Example: The table shows the register values before and after the change via bus access.
Register | Name | Before change | After change |
---|---|---|---|
764 | Modbus address | 246 | 12 |
765 | Baud rate | 0 = Auto | 1 = 9600 |
766 | Transmission format | 0 = 1-8-E-1 | 3 = 1-8-N-2 |
767 | Bus termination | 0 = Off | 0 = Off |
768 | Bus conf. command | 0 = Ready | 1 = Load |